netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

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Summary

CVECVE-2026-52998
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:10 UTC
Updated2026-07-15 12:55:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005080000 probability, percentile 0.397960000 (date 2026-07-13)

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/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 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 f4de0777e4554a7de19c920accde6319dd530782 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 c996a90f3071cf43683e5423da31aadbe002b8b4 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 edc806f9122961f0d3819f7c69c14cccde31f277 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 5d05de2f0928d81309a815ecc76d1a3ad72cbc16 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 95be653a76793856ff8b2d8bd82c2943c23f5ca8 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 79b90a96688e521771fa6ed3dc7864b76b8df293 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 83fc5dd63455a779ea2dd0f7ffee3c920919d80b git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 711987ba281fd806322a7cd244e98e2a81903114 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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