PT-2026-35135 · Linux · Linux

Published 2026-04-25 · Updated 2026-04-25 · CVE-2026-31675

Mitre

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.

Related Identifiers

CVE-2026-31675

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-31675 · Security Note
• https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad · Note
• https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f · Note
• https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908 · Note
• https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12 · Note
• https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b · Note