CVE-2021-47597

MEDIUMNVD 5.55.5

Also known asEUVD-2021-34599 (ENISA EUVD) · GHSA-q884-jcxw-49wr (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: 0.3%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

inet_diag: fix kernel-infoleak for UDP sockets

KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users.

After analysis it turned out UDP was not initializing r->idiag_expires. Other users of inet_sk_diag_fill() might make the same mistake in the future, so fix this in inet_sk_diag_fill().

[1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:156 [inline] _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 copy_to_iter include/linux/uio.h:155 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline] netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x5a9/0x630 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x1631/0x1980 fs/read_write.c:481 ksys_read+0x28c/0x520 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245 __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x1095/0x1360 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x16f3/0x1870 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_write_iter+0x594/0x690 net/socket.c:1057 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:924 [inline] do_writev+0x63f/0xe30 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [inline] __se_sys_writev fs/read_write.c:1037 [inline] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae

Bytes 68-71 of 312 are uninitialized Memory access of size 312 starts at ffff88812ab54000 Data copied to user address 0000000020001440

CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

CVSS v3: 5.5
EG Score: 5.5MEDIUMmedium confidence
EG Risk: 25
EPSS PROB: 0.3%
EPSS %ILE: 16th
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: 0.3% 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

June 19, 2024

Last Modified

November 21, 2024

References (4)

CVE Programhttps://git.kernel.org/stable/c/3a4f6dba1eb98101abc012ef968a8b10dac1ce50Patch
CVE Programhttps://git.kernel.org/stable/c/71ddeac8cd1d217744a0e060ff520e147c9328d1Patch
CVE Programhttps://git.kernel.org/stable/c/7b5596e531253ce84213d9daa7120b71c9d83198Patch
CVE Programhttps://git.kernel.org/stable/c/e5d28205bf1de7082d904ed277ceb2db2879e302Patch

Affected Packages

(4 across 4 ecosystems)

Debian:11(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	5.10.46-4 ... 5.10.92-1~bpo10+1 (6 versions)	every version up to 5.10.92-1: fixed in 5.10.92-1	—

Debian:12(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.15.15-1: fixed in 5.15.15-1	—

Debian:13(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.15.15-1: fixed in 5.15.15-1	—

Debian:14(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.15.15-1: fixed in 5.15.15-1	—

Weakness Classification(1)

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

CWE-908Use of Uninitialized Resource

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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 97 of 208 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 111 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

2026-11-02 16:38 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-11-01 16:30 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-31 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-30 16:30 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-29 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-28 16:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-27 16:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-26 16:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-25 18:18 UTCEG score recompute
2026-10-25 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-24 21:41 UTCEG score recompute
2026-10-24 21:41 UTCGHSA enrichmentGHSA-q884-jcxw-49wr · GitHub CVSS 5.5
2026-10-24 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-10-23 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-22 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-21 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-20 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-19 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-18 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-18 08:49 UTCEG score recompute
2026-10-17 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-16 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-15 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-14 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-13 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile

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2026-10-12 19:05 UTCEG score recompute
2026-10-12 16:30 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-11 23:31 UTCEG score recompute
2026-10-11 13:44 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-10 19:56 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-10 15:55 UTCOSV refresh
2026-10-09 20:04 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-08 16:40 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-07 23:45 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-06 15:14 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-05 17:40 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-04 23:19 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-03 14:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-10-02 16:23 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-30 15:45 UTCEG score recompute
2026-09-30 15:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-29 15:15 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-28 13:47 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-26 15:54 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-26 00:21 UTCEPSS rescoreEPSS 0.3% · 15th percentile
2026-09-24 14:00 UTCEPSS rescoreEPSS 0.3% · 14th percentile
2026-09-23 13:45 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-22 14:44 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-21 20:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-21 02:45 UTCOSV refresh
2026-09-20 20:13 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-19 15:38 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-18 19:24 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-17 19:23 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-16 14:05 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-09-15 03:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-12 14:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-11 14:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-11 09:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-08 21:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-07 15:58 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-06 13:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-05 15:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-04 13:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-04 05:03 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-02 14:09 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-09-02 00:42 UTCOSV refresh
2026-09-01 13:51 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-30 19:14 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-30 01:19 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-28 21:38 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-27 14:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-26 14:43 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-25 13:46 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-24 14:13 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-21 23:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-20 22:52 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-19 17:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-18 13:45 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-17 13:44 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-16 14:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-16 03:13 UTCOSV refresh
2026-08-16 02:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
2026-08-15 01:27 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-13 21:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-12 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-11 13:38 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-09 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-08 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-07 16:24 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-06 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-05 19:15 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-04 15:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-04 10:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-03 10:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-02 02:24 UTCEPSS rescoreEPSS 0.3% · 16th percentile
2026-08-01 04:13 UTCEPSS rescoreEPSS 0.3% · 16th percentile

Same CWE

10 shown

CWE-908

Frequently asked(5)

What is CVE-2021-47597?

CVE-2021-47597 is a medium-severity vulnerability; its CVE record was published on June 19, 2024. In the Linux kernel, the following vulnerability has been resolved: inet_diag: fix kernel-infoleak for UDP sockets KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users. After analysis it turned out UDP was not initializing r->idiag_expires. Other users of inet_sk_diag_fill()…

When was the CVE record for CVE-2021-47597 published?

The CVE record for CVE-2021-47597 was published on June 19, 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 November 21, 2024; the record at its source may have been updated since.

Is CVE-2021-47597 actively exploited?

CVE-2021-47597 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).

What is the CVSS score of CVE-2021-47597?

CVE-2021-47597 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-47597?

A fix for CVE-2021-47597 is available: update to the fixed version the vendor names in its advisory.

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CVE-2021-47597

📅 Published

🔄 Last Modified

🔗 References (4)