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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64531

net: openvswitch: reject oversized nested action attrs

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reject oversized nested action attrs Open vSwitch stores generated flow actions as nlattrs, whose nla_len field is u16. Commit a1e64addf3ff ("net: openvswitch: remove misbehaving actions length check") allowed the total sw_flow_actions stream to grow beyond 64 KiB, which is valid, but also removed the last guard preventing a generated nested action attribute from exceeding U16_MAX. An oversized generated container can thus be closed with a truncated nla_len. A later dump or teardown then walks a structurally different stream than the one that was validated. In particular, an oversized nested CLONE/CT action may cause subsequent bytes in the generated stream to be interpreted as independent actions. Keep the larger total-action-stream behavior, but make nested action close reject generated containers that do not fit in nla_len, and return the error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and CHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse construction order before discarding failed wrappers, so resources copied into the rejected tails are released before the wrappers are removed. Most failed outer wrappers are discarded by truncating actions_len after child resources have been released. CHECK_PKT_LEN also trims its parent after branch resources are gone. SET/TUNNEL close failures unwind their known tun_dst ownership directly, and SET_TO_MASKED has no external ownership and truncates on close failure.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 057dbc5b72e9fcac439cd561c3a539b8a0edeb92 to < ab855641241387db062a5e41d9ad6b8561542572affected
  • 2532adbfe917c0e71dba2650ffc6efe396314c87 to < c66bd2626c2764f23764ff0f8277f44a9cfe8349affected
  • 4b1a0ee6164c7204c68ab5a9c48c07bfe8852485 to < d573250d228401f707f4dbc09d11227a6215ee5faffected
  • e6610f9c08b4c04cf7949c10fc246c071d00e935 to < f1efff8858403191361a01269c6fe8dd7f55a385affected
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 to < dbd14f736be02cfe73049bd801af89becd1a0749affected
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 to < 1b41cbe05b184f8861712f0806cc0c4f5d8c6dfeaffected
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 to < 3f1f755366687d051174739fb99f7d560202f60baffected
  • 6b099d285d7ed324494b6d684f377aa103856118affected
  • 5.15.180 to < 5.15.212affected
  • 6.1.132 to < 6.1.178affected
  • 6.6.84 to < 6.6.145affected
  • 6.12.20 to < 6.12.97affected
  • 6.13.8 to < 6.14affected

Linux Linux

Default version status: affected

  • 6.14affected
  • 0 to < 6.14unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References