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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-31675 Detail

Description

In 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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f kernel.org
https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12 kernel.org
https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad kernel.org
https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908 kernel.org
https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-31675
NVD Published Date:
04/25/2026
NVD Last Modified:
04/25/2026
Source:
kernel.org