net/sched: sch_netem: fix out-of-bounds access in packet corruption

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Summary

CVECVE-2026-31675
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:01 UTC
Updated2026-05-06 21:33:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In netem_enqueue(), the packet corruption logic uses get_random_u32_below(skb_headlen(skb)) to select an index for modifying skb->data. When an AF_PACKET TX_RING sends fully non-linear packets over an IPIP tunnel, skb_headlen(skb) evaluates to 0. Passing 0 to get_random_u32_below() takes the variable-ceil slow path which returns an unconstrained 32-bit random integer. Using this unconstrained value as an offset into skb->data results in an out-of-bounds memory access. Fix this by verifying skb_headlen(skb) is non-zero before attempting to corrupt the linear data area. Fully non-linear packets will silently bypass the corruption logic.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-125

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

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 c865e5d99e25a171e8262fc0f7ba608568633c64 a14b56863348686dd0387eea8ce66b85cf455908 git Not specified
CNA Linux Linux affected c865e5d99e25a171e8262fc0f7ba608568633c64 13a66ca1e235d4bcd53d12d4c68490cad7f8e46f git Not specified
CNA Linux Linux affected c865e5d99e25a171e8262fc0f7ba608568633c64 3a2999704ac36cfb4041fed3652d26a3373e8d12 git Not specified
CNA Linux Linux affected c865e5d99e25a171e8262fc0f7ba608568633c64 4fd258e281fa8bc15e9ce2c7691941537e9258ad git Not specified
CNA Linux Linux affected c865e5d99e25a171e8262fc0f7ba608568633c64 d64cb81dcbd54927515a7f65e5e24affdc73c14b git Not specified
CNA Linux Linux affected 2.6.16 Not specified
CNA Linux Linux unaffected 2.6.16 semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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