Vulnerability-Lookup

CVE-2026-53274 (GCVE-0-2026-53274)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/35a22117839602bb5…
https://git.kernel.org/stable/c/5d27d2ffe487df89c…
https://git.kernel.org/stable/c/89f6fbe0033c942cb…
https://git.kernel.org/stable/c/dcd90f42a33e42203…
https://git.kernel.org/stable/c/94d286fa5eedc550d…
https://git.kernel.org/stable/c/a3fdd924d88c30b9f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 35a22117839602bb52283de08894c5a7dde92420 (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 5d27d2ffe487df89ce28fda0410eafa05dbe03a0 (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < dcd90f42a33e4220385f27b515183d0c91b2fc4a (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < 94d286fa5eedc550d42bcb9c85416af8f77736ff (git) Affected: a6a6fe27bab48f0d09a64b051e7bde432fcae081 , < a3fdd924d88c30b9f488636ce0e4696012cf5511 (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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      "title": "net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS",
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GHSA-22M3-G27G-5H2V

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

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.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53274"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS\n\nA logic flaw in __smc_setsockopt() allows a local unprivileged user to\ncause a Denial of Service (DoS) by holding the socket lock indefinitely.\n\nThe function __smc_setsockopt() calls copy_from_sockptr() while holding\nlock_sock(sk). By passing a userfaultfd-monitored memory page (or\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\nas the optval, an attacker can halt execution during the copy operation,\nkeeping the lock held.\n\nCombined with asynchronous tear-down operations like shutdown(), this\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\n\n[  240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\n[  240.123489] Call Trace:\n[  240.123501]  smc_shutdown+...\n[  240.123512]  lock_sock_nested+...\n\nThis patch moves the user-space copy outside the lock_sock() critical\nsection to prevent the issue.",
  "id": "GHSA-22m3-g27g-5h2v",
  "modified": "2026-06-25T09:31:23Z",
  "published": "2026-06-25T09:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53274"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91"
    },
    {
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      "url": "https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-53274 (GCVE-0-2026-53274)

GHSA-22M3-G27G-5H2V

Tags

Sightings

Nomenclature