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Vulnerability record · CVE-2026-31675 · published 25 April 2026

CVE-2026-31675: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 92.9% CWE-125 · Out-of-bounds read
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31675), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.