CVE-2026-31675

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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

CWEs

CWE-125, CWE-787

Published

2026-04-25

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f
• https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12
• https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad
• https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908
• https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b

Check your stackJSON