CVE-2026-31675High· 7.8▾ TwilightIn 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 sele…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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.
Linux >= c865e5d99e25a171e8262fc0f7ba608568633c64 < a14b56863348686dd0387eea8ce66b85cf455908Linux >= c865e5d99e25a171e8262fc0f7ba608568633c64 < 13a66ca1e235d4bcd53d12d4c68490cad7f8e46fLinux >= c865e5d99e25a171e8262fc0f7ba608568633c64 < 3a2999704ac36cfb4041fed3652d26a3373e8d12Linux >= c865e5d99e25a171e8262fc0f7ba608568633c64 < 4fd258e281fa8bc15e9ce2c7691941537e9258adLinux >= c865e5d99e25a171e8262fc0f7ba608568633c64 < d64cb81dcbd54927515a7f65e5e24affdc73c14bLinux 2.6.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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