CVE-2026-80584

CVE CVE-2026-80584EUVD EUVD-2026-66499Published 2026-08-26T14:37:40.000ZLast changed 2026-08-27T05:02:04.000ZCVSS 8.4

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: s390/qeth: validate user buffer length in SNMP and ARP query ioctls qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by a user-supplied length (udata_len) without checking a lower bound, then set udata_offset to a fixed non-zero value and pass both to a reply callback. The callback bounds-checks the copy with if ((udata_len - udata_offset) < len) Both fields are u32, so a udata_len smaller than udata_offset makes the subtraction wrap and the check pass, and the following memcpy() writes past the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from kzalloc(), which the existing NULL check does not catch. Reject buffers smaller than udata_offset before allocating, so the callback subtraction can no longer underflow.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 4a71df50047f0db65ea09b1be155852e81a45eba <46443eaddebd84c51940857b11787229be169dec; 4a71df50047f0db65ea09b1be155852e81a45eba <cc423f4105fe145b33e1d7cad34245a798358f73; 4a71df50047f0db65ea09b1be155852e81a45eba <91935843f9396a9e45253e2c0d4337ca1371754b; patch: 6.6.153; 4a71df50047f0db65ea09b1be155852e81a45eba <75fb3151513d7d9f77a8f9545418279b119c06b8; patch: 7.2; patch: 6.18.46; 4a71df50047f0db65ea09b1be155852e81a45eba <9d00eeb2d27f4cc817c5e408760226d43f811ec6; patch: 7.1.10; patch: 5.10.266; 4a71df50047f0db65ea09b1be155852e81a45eba <3083818e67bcd656965797fbac9a3d6c1d44f78a; patch: 0; patch: 6.1.184; patch: 5.15.217; 2.6.26; 4a71df50047f0db65ea09b1be155852e81a45eba <d141f087b1af656f055d7c5793a3e87817ba0bbe; 4a71df50047f0db65ea09b1be155852e81a45eba <a3083647747942ea32faf14560d6397ff3068046; patch: 6.12.105

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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