CVE-2026-53274net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < 35a22117839602bb52283de08894c5a7dde92420
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < 5d27d2ffe487df89ce28fda0410eafa05dbe03a0
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < dcd90f42a33e4220385f27b515183d0c91b2fc4a
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < 94d286fa5eedc550d42bcb9c85416af8f77736ff
- affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 – < a3fdd924d88c30b9f488636ce0e4696012cf5511
- affected 5.18
- unaffected < 5.18
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References6
- https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420 (opens in a new tab)
- https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0 (opens in a new tab)
- https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 (opens in a new tab)
- https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a (opens in a new tab)
- https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff (opens in a new tab)
- https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-39225 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53274)Record last updated .