CVE-2026-53274

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS

A logic flaw in __smc_setsockopt() allows a local unprivileged user to cause a Denial of Service (DoS) by holding the socket lock indefinitely.

The function __smc_setsockopt() calls copy_from_sockptr() while holding lock_sock(sk). By passing a userfaultfd-monitored memory page (or FUSE-backed memory on systems where unprivileged userfaultfd is disabled) as the optval, an attacker can halt execution during the copy operation, keeping the lock held.

Combined with asynchronous tear-down operations like shutdown(), this exhausts the kernel wq (kworkers) and triggers the hung task watchdog.

[ 240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds. [ 240.123489] Call Trace: [ 240.123501] smc_shutdown+... [ 240.123512] lock_sock_nested+...

This patch moves the user-space copy outside the lock_sock() critical section to prevent the issue.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 8, 2026

Advisory Details (6)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0
generic

net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420

Vendor Advisories for CVE-2026-53274(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 184 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 13:47 UTCEPSS rescore
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 13:54 UTCEPSS rescore
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-30 19:37 UTCEG score recompute
  11. 2026-08-30 19:37 UTCVendor advisory
  12. 2026-08-30 19:36 UTCGHSA enrichment
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-28 21:41 UTCEPSS rescore
  15. 2026-08-27 23:57 UTCEG score recompute
  16. 2026-08-27 23:57 UTCVendor advisory
  17. 2026-08-27 23:57 UTCGHSA enrichment
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-24 21:51 UTCEG score recompute
  22. 2026-08-24 21:51 UTCVendor advisory
  23. 2026-08-24 21:51 UTCGHSA enrichment
  24. 2026-08-23 15:06 UTCVendor advisory
  25. 2026-08-23 15:06 UTCGHSA enrichment
Show 75 more
  1. 2026-08-22 12:47 UTCVendor advisory
  2. 2026-08-22 12:47 UTCGHSA enrichment
  3. 2026-08-21 09:24 UTCEG score recompute
  4. 2026-08-21 09:24 UTCVendor advisory
  5. 2026-08-21 09:24 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 07:06 UTCEG score recompute
  8. 2026-08-20 07:06 UTCVendor advisory
  9. 2026-08-20 07:05 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 01:30 UTCEG score recompute
  12. 2026-08-19 01:30 UTCVendor advisory
  13. 2026-08-19 01:30 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 18:24 UTCEG score recompute
  17. 2026-08-16 18:24 UTCVendor advisory
  18. 2026-08-16 18:24 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 15:21 UTCEG score recompute
  22. 2026-08-15 15:21 UTCVendor advisory
  23. 2026-08-15 15:21 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 13:02 UTCEG score recompute
  26. 2026-08-14 13:02 UTCVendor advisory
  27. 2026-08-14 13:02 UTCGHSA enrichment
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-13 10:44 UTCEG score recompute
  30. 2026-08-13 10:44 UTCVendor advisory
  31. 2026-08-13 10:44 UTCGHSA enrichment
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-12 08:25 UTCEG score recompute
  34. 2026-08-12 08:25 UTCVendor advisory
  35. 2026-08-12 08:25 UTCGHSA enrichment
  36. 2026-08-11 06:07 UTCEG score recompute
  37. 2026-08-11 06:07 UTCVendor advisory
  38. 2026-08-11 06:07 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 03:49 UTCEG score recompute
  41. 2026-08-10 03:49 UTCVendor advisory
  42. 2026-08-10 03:49 UTCGHSA enrichment
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-09 01:31 UTCEG score recompute
  45. 2026-08-09 01:31 UTCVendor advisory
  46. 2026-08-09 01:31 UTCGHSA enrichment
  47. 2026-08-08 16:37 UTCEPSS rescore
  48. 2026-08-07 23:12 UTCEG score recompute
  49. 2026-08-07 23:12 UTCGHSA enrichment
  50. 2026-08-06 20:54 UTCEG score recompute
  51. 2026-08-06 20:54 UTCVendor advisory
  52. 2026-08-06 20:54 UTCGHSA enrichment
  53. 2026-08-06 13:47 UTCEPSS rescore
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-05 18:36 UTCGHSA enrichment
  56. 2026-08-04 16:18 UTCEG score recompute
  57. 2026-08-04 16:18 UTCVendor advisory
  58. 2026-08-04 16:18 UTCGHSA enrichment
  59. 2026-08-04 15:10 UTCEPSS rescore
  60. 2026-08-04 10:39 UTCEPSS rescore
  61. 2026-08-03 13:58 UTCEG score recompute
  62. 2026-08-03 13:58 UTCVendor advisory
  63. 2026-08-03 13:58 UTCGHSA enrichment
  64. 2026-08-03 10:36 UTCEPSS rescore
  65. 2026-08-02 08:24 UTCEG score recompute
  66. 2026-08-02 08:24 UTCVendor advisory
  67. 2026-08-02 08:24 UTCGHSA enrichment
  68. 2026-08-02 02:27 UTCEPSS rescore
  69. 2026-08-01 06:05 UTCEG score recompute
  70. 2026-08-01 06:05 UTCVendor advisory
  71. 2026-08-01 06:05 UTCGHSA enrichment
  72. 2026-08-01 04:16 UTCEPSS rescore
  73. 2026-07-31 03:15 UTCEG score recompute
  74. 2026-07-31 03:15 UTCVendor advisory
  75. 2026-07-31 03:15 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-53274?
CVE-2026-53274 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: net/smc: fix sleep-inside-lock in smc_setsockopt() causing local DoS A logic flaw in smc_setsockopt() allows a local unprivileged user to cause a Denial of Service (DoS) by holding the socket lock indefinitely. The function…
When was CVE-2026-53274 disclosed?
CVE-2026-53274 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53274 actively exploited?
CVE-2026-53274 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.2% of all scored CVEs.
What is the CVSS score of CVE-2026-53274?
CVE-2026-53274 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53274, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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