CVE-2026-31752 PUBLISHED

bridge: br_nd_send: validate ND option lengths

Assigner: Linux
Reserved: 09.03.2026 Published: 01.05.2026 Updated: 01.05.2026

In the Linux kernel, the following vulnerability has been resolved:

bridge: br_nd_send: validate ND option lengths

br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 259466f76f5a2148aff11134e68f4b4c6d52725b (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to c49b9256bbacb6a135654aebd12e4c0e87166b7c (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 837392a38445729c22e03d3abcf33f07763efd85 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to e71303a9190496136e240c4f2872b7b0b16027a7 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 850837965af15707fd3142c1cf3c5bfaf022299b (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.15 is affected
  • unaffected from 0 to 4.15 (excl.)
  • unaffected from 5.10.253 to 5.10.* (incl.)
  • unaffected from 5.15.203 to 5.15.* (incl.)
  • unaffected from 6.1.168 to 6.1.* (incl.)
  • unaffected from 6.6.134 to 6.6.* (incl.)
  • unaffected from 6.12.81 to 6.12.* (incl.)
  • unaffected from 6.18.22 to 6.18.* (incl.)
  • unaffected from 6.19.12 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References