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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "value": "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."
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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 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      "cve": "CVE-2026-53274",
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      "product_status:first_fixed": "2",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53274",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53274.json",
      "version": "15"
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  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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