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5.5
MEDIUM CVSS 3.1
CVE-2026-53274
net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
Overview
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.

Details
INFO

Published Date :

June 25, 2026, 9:16 a.m.

Last Modified :

July 8, 2026, 4 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-53274 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Fix a logic flaw in __smc_setsockopt() that can cause a local Denial of Service.
  • Update the Linux kernel to include the security patch.
  • Apply the provided patch to the affected kernel version.
  • Ensure user-space copies are outside the lock_sock() critical section.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-53274.

URL Resource
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/94d286fa5eedc550d42bcb9c85416af8f77736ff Patch
https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511 Patch
https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-53274 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-53274 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-53274 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-53274 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jul. 08, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.18 up to (excluding) 6.1.176
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a Types: Patch
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 25, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': '35a22117839602bb52283de08894c5a7dde92420', 'versionType': 'git'}, {'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': '5d27d2ffe487df89ce28fda0410eafa05dbe03a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': '89f6fbe0033c942cb790ffd53ca93a45eeaf1c91', 'versionType': 'git'}, {'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': 'dcd90f42a33e4220385f27b515183d0c91b2fc4a', 'versionType': 'git'}, {'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': '94d286fa5eedc550d42bcb9c85416af8f77736ff', 'versionType': 'git'}, {'status': 'affected', 'version': 'a6a6fe27bab48f0d09a64b051e7bde432fcae081', 'lessThan': 'a3fdd924d88c30b9f488636ce0e4696012cf5511', 'versionType': 'git'}], 'programFiles': ['net/smc/af_smc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/smc/af_smc.c'], 'defaultStatus': 'affected'}]
    Added 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.
    Added Reference https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420
    Added Reference https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0
    Added Reference https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91
    Added Reference https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff
    Added Reference https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511
    Added Reference https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact