In the Linux kernel, the following vulnerability has been resolved:

smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().

smc_clc_prfx_set() is called during connect() and not under RCU
nor RTNL.

Using sk_dst_get(sk)->dev could trigger UAF.

Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock()
after kernel_getsockname().

Note that the returned value of smc_clc_prfx_set() is not used
in the caller.

While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu()
not to touch dst there.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00027.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
a046d57da19f812216f393e7c535f5858f793ac3 affected < 0736993bfe5c7a9c744ae3fac62d769dfdae54e1
a046d57da19f812216f393e7c535f5858f793ac3 affected < 935d783e5de9b64587f3adb25641dd8385e64ddb
Linux Linux affected
Version Status Constraints
4.11 affected —
0 unaffected < 4.11
6.17.3 unaffected ≤ 6.17.*
6.18 unaffected ≤ *

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/0736993bfe5c7a9c744ae3fac62d769dfdae54e1 cve-icon cve-icon
https://git.kernel.org/stable/c/935d783e5de9b64587f3adb25641dd8385e64ddb cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025111255-CVE-2025-40139-a030@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40139 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40139 cve-icon
History

Mon, 01 Dec 2025 06:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Fri, 14 Nov 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Wed, 12 Nov 2025 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 12 Nov 2025 10:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set(). smc_clc_prfx_set() is called during connect() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock() after kernel_getsockname(). Note that the returned value of smc_clc_prfx_set() is not used in the caller. While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu() not to touch dst there.
Title smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-01T06:18:47.147Z

Reserved: 2025-04-16T07:20:57.171Z

Link: CVE-2025-40139

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-12T11:15:43.677

Modified: 2025-11-12T16:19:12.850

Link: CVE-2025-40139

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-11-12T00:00:00Z

Links: CVE-2025-40139 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-11-12T22:12:33Z

Weaknesses

No weakness.