sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy

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Summary

CVECVE-2025-21640
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-01-19 11:15:09 UTC
Updated2026-05-12 13:16:30 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b 5599b212d2f4466e1832a94e9932684aaa364587 git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b 03ca51faba2b017bf6c90e139434c4117d0afcdc git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b 86ddf8118123cb58a0fb8724cad6979c4069065b git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b 3cd0659deb9c03535fd61839e91d4d4d3e51ac71 git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b ad673e514b2793b8d5902f6ba6ab7e890dea23d5 git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b f0bb3935470684306e4e04793a20ac4c4b08de0b git Not specified
CNA Linux Linux affected 3c68198e75111a905ac2412be12bf7b29099729b ea62dd1383913b5999f3d16ae99d411f41b528d4 git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 5.4.292 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.234 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.177 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.125 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.72 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.10 6.12.* semver Not specified
CNA Linux Linux unaffected 6.13 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5599b212d2f4466e1832a94e9932684aaa364587 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
lists.debian.org/debian-lts-announce/2025/03/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/03ca51faba2b017bf6c90e139434c4117d0afcdc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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