net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
Summary
| CVE | CVE-2026-53274 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-25 09:16:45 UTC |
| Updated | 2026-06-25 09:16:45 UTC |
| 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. |
Risk And Classification
EPSS: 0.001810000 probability, percentile 0.078200000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 35a22117839602bb52283de08894c5a7dde92420 git | Not specified |
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 5d27d2ffe487df89ce28fda0410eafa05dbe03a0 git | Not specified |
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 git | Not specified |
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 dcd90f42a33e4220385f27b515183d0c91b2fc4a git | Not specified |
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 94d286fa5eedc550d42bcb9c85416af8f77736ff git | Not specified |
| CNA | Linux | Linux | affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 a3fdd924d88c30b9f488636ce0e4696012cf5511 git | Not specified |
| CNA | Linux | Linux | affected 5.18 | Not specified |
| CNA | Linux | Linux | unaffected 5.18 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.94 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.36 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.13 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.