sctp: sysctl: rto_min/max: avoid using current->nsproxy

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Summary

CVECVE-2025-21639
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: rto_min/max: 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.rto_min/max' 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 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9 git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 246428bfb9e7db15c5cd08e1d0eca41b65af2b06 git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 0f78f09466744589e420935e646ae78212a38290 git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482 git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 c87f1f6ade56c711f8736901e330685b453e420e git Not specified
CNA Linux Linux affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 9fc17b76fc70763780aa78b38fcf4742384044a5 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.4.290 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/246428bfb9e7db15c5cd08e1d0eca41b65af2b06 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
git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c87f1f6ade56c711f8736901e330685b453e420e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9fc17b76fc70763780aa78b38fcf4742384044a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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