CVE-2023-52772

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2023-59489 (ENISA EUVD) · GHSA-g4gj-3g5h-w4h5 (GitHub Security Advisories)Source: ENISA EUVD

7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

af_unix: fix use-after-free in unix_stream_read_actor()

syzbot reported the following crash [1]

After releasing unix socket lock, u->oob_skb can be changed by another thread. We must temporarily increase skb refcount to make sure this other thread will not free the skb under us.

[1]

BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 Read of size 4 at addr ffff88801f3b9cc4 by task syz-executor107/5297

CPU: 1 PID: 5297 Comm: syz-executor107 Not tainted 6.6.0-syzkaller-15910-gb8e3a87a627b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace:

__dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 unix_stream_recv_urg net/unix/af_unix.c:2587 [inline] unix_stream_read_generic+0x19a5/0x2480 net/unix/af_unix.c:2666 unix_stream_recvmsg+0x189/0x1b0 net/unix/af_unix.c:2903 sock_recvmsg_nosec net/socket.c:1044 [inline] sock_recvmsg+0xe2/0x170 net/socket.c:1066 ____sys_recvmsg+0x21f/0x5c0 net/socket.c:2803 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845 __sys_recvmsg+0x114/0x1e0 net/socket.c:2875 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fc67492c559 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc6748ab228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007fc67492c559 RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007fc6749b6348 R08: 00007fc6748ab6c0 R09: 00007fc6748ab6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6749b6340 R13: 00007fc6749b634c R14: 00007ffe9fac52a0 R15: 00007ffe9fac5388

Allocated by task 5295: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x180/0x3c0 mm/slub.c:3523 __alloc_skb+0x287/0x330 net/core/skbuff.c:641 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780 sock_alloc_send_skb include/net/sock.h:1884 [inline] queue_oob net/unix/af_unix.c:2147 [inline] unix_stream_sendmsg+0xb5f/0x10a0 net/unix/af_unix.c:2301 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Freed by task 5295: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf8/0x340 mm/slub.c:3831 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:1015 __kfree_skb net/core/skbuff.c:1073 [inline] consume_skb net/core/skbuff.c:1288 [inline] consume_skb+0xdf/0x170 net/core/skbuff.c:1282 queue_oob net/unix/af_unix.c:2178 [inline] u ---truncated---

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
15th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 21, 2024

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Aug 4, 2026
Patch available.
Web page

af_unix: fix use-after-free in unix_stream_read_actor() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eae0b295ce16d8c8b4114c3037993191b4bb92f0
Web page

af_unix: fix use-after-free in unix_stream_read_actor() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d179189eec426fe4801e4b91efa1889faed12700
Web page

af_unix: fix use-after-free in unix_stream_read_actor() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75bcfc188abf4fae9c1d5f5dc0a03540be602eef
Web page

af_unix: fix use-after-free in unix_stream_read_actor() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4b7b492615cf3017190f55444f7016812b66611d
Web page

af_unix: fix use-after-free in unix_stream_read_actor() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/069a3ec329ff43e7869a3d94c62cd03203016bce

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
linuxKernel @ 5.15.140 (fixes >=5.15.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.27-1 ... 6.1.55-1~bpo11+1 (11 versions)
  • every version up to 6.1.64-1: fixed in 6.1.64-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.6.8-1: fixed in 6.6.8-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.6.8-1: fixed in 6.6.8-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 93 of 210 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 7 repeat rows among the latest 100 are merged into the row they repeat. The 117 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  2. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  3. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  4. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  5. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  6. 2026-10-28 07:46 UTCEG score recompute
  7. 2026-10-28 07:46 UTCGHSA enrichmentGHSA-g4gj-3g5h-w4h5 · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  9. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  10. 2026-10-25 17:28 UTCEG score recompute
  11. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  12. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-20 21:18 UTCEG score recompute
  17. 2026-10-20 21:18 UTCGHSA enrichmentGHSA-g4gj-3g5h-w4h5 · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-10-19 14:55 UTCOSV refresh
  21. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-10-18 07:42 UTCEG score recompute
  23. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 68 more
  1. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-12 18:13 UTCEG score recompute
  4. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-10-11 21:38 UTCEG score recompute
  6. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-09-30 16:36 UTCEG score recompute
  17. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  18. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  20. 2026-09-26 21:11 UTCOSV refresh
  21. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  24. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  26. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  27. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  28. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  29. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  30. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  31. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  32. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  33. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-09-07 06:48 UTCOSV refresh
  36. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  37. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  39. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  40. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  41. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  42. 2026-09-01 04:36 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  45. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  48. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  49. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  51. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  52. 2026-08-20 16:31 UTCOSV refresh
  53. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  54. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  55. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  57. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  58. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  60. 2026-08-11 13:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  62. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  63. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  64. 2026-08-07 16:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  66. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  67. 2026-08-05 10:24 UTCEG score recompute
  68. 2026-08-05 10:24 UTCGHSA enrichmentGHSA-g4gj-3g5h-w4h5 · GitHub severity HIGH · GitHub CVSS 7.8

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-52772?
CVE-2023-52772 is a high-severity vulnerability; its CVE record was published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: af_unix: fix use-after-free in unix_stream_read_actor() syzbot reported the following crash [1] After releasing unix socket lock, u->oob_skb can be changed by another thread. We must temporarily increase skb refcount to make sure…
When was the CVE record for CVE-2023-52772 published?
The CVE record for CVE-2023-52772 was published on May 21, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 5, 2026; the record at its source may have been updated since.
Is CVE-2023-52772 actively exploited?
CVE-2023-52772 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-52772?
CVE-2023-52772 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-52772?
A fix for CVE-2023-52772 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-52772

Explore →

Is Your Infrastructure Affected by CVE-2023-52772?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs