CVE-2023-53439

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory published 2025-09-18. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2025-29866 (ENISA EUVD) · GHSA-67x9-72qp-w8c9 (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

net: skb_partial_csum_set() fix against transport header magic value

skb->transport_header uses the special 0xFFFF value to mark if the transport header was set or not.

We must prevent callers to accidentaly set skb->transport_header to 0xFFFF. Note that only fuzzers can possibly do this today.

syzbot reported:

WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 skb_transport_offset include/linux/skbuff.h:2956 [inline] WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 virtio_net_hdr_to_skb+0xbcc/0x10c0 include/linux/virtio_net.h:103 Modules linked in: CPU: 0 PID: 2340 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:skb_transport_header include/linux/skbuff.h:2847 [inline] RIP: 0010:skb_transport_offset include/linux/skbuff.h:2956 [inline] RIP: 0010:virtio_net_hdr_to_skb+0xbcc/0x10c0 include/linux/virtio_net.h:103 Code: 41 39 df 0f 82 c3 04 00 00 48 8b 7c 24 10 44 89 e6 e8 08 6e 59 ff 48 85 c0 74 54 e8 ce 36 7e fc e9 37 f8 ff ff e8 c4 36 7e fc <0f> 0b e9 93 f8 ff ff 44 89 f7 44 89 e6 e8 32 38 7e fc 45 39 e6 0f RSP: 0018:ffffc90004497880 EFLAGS: 00010293 RAX: ffffffff84fea55c RBX: 000000000000ffff RCX: ffff888120be2100 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff RBP: ffffc90004497990 R08: ffffffff84fe9de5 R09: 0000000000000034 R10: ffffea00048ebd80 R11: 0000000000000034 R12: ffff88811dc2d9c8 R13: dffffc0000000000 R14: ffff88811dc2d9ae R15: 1ffff11023b85b35 FS: 00007f9211a59700(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c0 CR3: 00000001215a5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:

packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x4590/0x61a0 net/packet/af_packet.c:3115 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] __sys_sendto+0x472/0x630 net/socket.c:2144 __do_sys_sendto net/socket.c:2156 [inline] __se_sys_sendto net/socket.c:2152 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2152 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f9210c8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9211a59168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9210dabf80 RCX: 00007f9210c8c169 RDX: 000000000000ffed RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f9210ce7ca1 R08: 0000000020000540 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe135d65cf R14: 00007f9211a59300 R15: 0000000000022000

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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
0.1%
EPSS %ILE
3rd
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). 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

September 18, 2025

Last Modified

January 14, 2026

References (3)

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
linuxKernel @ 6.1.30 (fixes >=5.19.0)—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
  • every version up to 6.1.37-1: fixed in 6.1.37-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.3.7-1: fixed in 6.3.7-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.3.7-1: fixed in 6.3.7-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 35× 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 184 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 91 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:40 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-25 17:28 UTCEG score recompute
  10. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-24 11:34 UTCEG score recompute
  13. 2026-10-24 11:34 UTCGHSA enrichmentGHSA-67x9-72qp-w8c9 · GitHub CVSS 5.5
  14. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-18 07:40 UTCEG score recompute
  21. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
Show 68 more
  1. 2026-10-12 18:12 UTCEG score recompute
  2. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-11 21:37 UTCEG score recompute
  4. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-02 04:40 UTCOSV refresh
  13. 2026-09-30 16:37 UTCEG score recompute
  14. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  21. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-09-12 23:06 UTCOSV refresh
  27. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  30. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  34. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  37. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-09-01 04:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  45. 2026-08-25 03:26 UTCOSV refresh
  46. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  47. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  48. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  49. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  50. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-08-11 13:40 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  57. 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-08-08 20:49 UTCOSV refresh
  60. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  61. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-04 10:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  64. 2026-08-03 10:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-08-01 04:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-07-30 16:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-07-30 01:29 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-53439?
CVE-2023-53439 is a medium-severity vulnerability; its CVE record was published on September 18, 2025. In the Linux kernel, the following vulnerability has been resolved: net: skb_partial_csum_set() fix against transport header magic value skb->transport_header uses the special 0xFFFF value to mark if the transport header was set or not. We must prevent callers to accidentaly set…
When was the CVE record for CVE-2023-53439 published?
The CVE record for CVE-2023-53439 was published on September 18, 2025. 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 January 14, 2026; the record at its source may have been updated since.
Is CVE-2023-53439 actively exploited?
CVE-2023-53439 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-53439?
CVE-2023-53439 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2023-53439?
A fix for CVE-2023-53439 is available: update to the fixed version the vendor names in its advisory.

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