CVE-2026-53274None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < 35a22117839602bb52283de08894c5a7dde92420Linux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < 5d27d2ffe487df89ce28fda0410eafa05dbe03a0Linux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91Linux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < dcd90f42a33e4220385f27b515183d0c91b2fc4aLinux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < 94d286fa5eedc550d42bcb9c85416af8f77736ffLinux >= a6a6fe27bab48f0d09a64b051e7bde432fcae081 < a3fdd924d88c30b9f488636ce0e4696012cf5511Linux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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