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CVE-2026-80584

s390/qeth: validate user buffer length in SNMP and ARP query ioctls

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in 9d00eeb2d27f4cc817c5e408760226d43f811ec6; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in 46443eaddebd84c51940857b11787229be169dec; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in 91935843f9396a9e45253e2c0d4337ca1371754b; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in cc423f4105fe145b33e1d7cad34245a798358f73; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in 3083818e67bcd656965797fbac9a3d6c1d44f78a; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in a3083647747942ea32faf14560d6397ff3068046; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in 75fb3151513d7d9f77a8f9545418279b119c06b8; From 4a71df50047f0db65ea09b1be155852e81a45eba · fixed in d141f087b1af656f055d7c5793a3e87817ba0bbe

  • Linux Linux

    2.6.26

  • KernelLinux

    From 2.6.26 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.153; From 6.7.0 · fixed in 6.12.105; From 6.13.0 · fixed in 6.18.46; From 6.19.0 · fixed in 7.1.10

References 8

git.kernel.org