Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.16, < 6.6.134 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46fPatch
- https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12Patch
- https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258adPatch
- https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908Patch
- https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14bPatch
FAQ
What is CVE-2026-31675?
CVE-2026-31675 is a vulnerability with a CVSS score of 7.8 (HIGH). 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_rando...
How severe is CVE-2026-31675?
CVE-2026-31675 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31675?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.