Medium 5.5Published Jun 25, 2026

CVE-2026-53274net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS

Updated under an hour ago (Oct 26, 2026, 1:10 PM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before 35a22117839602bb52283de08894c5a7dde92420; from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before 5d27d2ffe487df89ce28fda0410eafa05dbe03a0; from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91; from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before dcd90f42a33e4220385f27b515183d0c91b2fc4a; from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before 94d286fa5eedc550d42bcb9c85416af8f77736ff; from a6a6fe27bab48f0d09a64b051e7bde432fcae081 before a3fdd924d88c30b9f488636ce0e4696012cf5511	CNA record
linux linux_kernel linux:linux_kernel	from 5.18 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1	NVD

References

References

https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420	patch
https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0	patch
https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91	patch
https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a	patch
https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff	patch
https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.