7.8 CVE-2026-64531

Enriched by CISA Exploit
 

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.
https://nvd.nist.gov/vuln/detail/CVE-2026-64531

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 057dbc5b72e9fcac439cd561c3a539b8a0edeb92 < ab855641241387db062a5e41d9ad6b8561542572 [affected]
  • 2532adbfe917c0e71dba2650ffc6efe396314c87 < c66bd2626c2764f23764ff0f8277f44a9cfe8349 [affected]
  • 4b1a0ee6164c7204c68ab5a9c48c07bfe8852485 < d573250d228401f707f4dbc09d11227a6215ee5f [affected]
  • e6610f9c08b4c04cf7949c10fc246c071d00e935 < f1efff8858403191361a01269c6fe8dd7f55a385 [affected]
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 < dbd14f736be02cfe73049bd801af89becd1a0749 [affected]
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 < 1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe [affected]
  • a1e64addf3ff9257b45b78bc7d743781c3f41340 < 3f1f755366687d051174739fb99f7d560202f60b [affected]
  • 6b099d285d7ed324494b6d684f377aa103856118 [affected]
  • 5.15.180 < 5.15.212 [affected]
  • 6.1.132 < 6.1.178 [affected]
  • 6.6.84 < 6.6.145 [affected]
  • 6.12.20 < 6.12.97 [affected]
  • 6.13.8 < 6.14 [affected]
Linux Linux
  • 6.14 [affected]
  • < 6.14 [unaffected]
  • 5.15.212 ≤ 5.15.* [unaffected]
  • 6.1.178 ≤ 6.1.* [unaffected]
  • 6.6.145 ≤ 6.6.* [unaffected]
  • 6.12.97 ≤ 6.12.* [unaffected]
  • 6.18.40 ≤ 6.18.* [unaffected]
  • 7.1.5 ≤ 7.1.* [unaffected]
  • 7.2-rc4 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.15.180 < 5.15.212
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.1.132 < 6.1.178
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.6.84 < 6.6.145
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.12.20 < 6.12.97
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 6.18.40
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 7.1.5
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 7.2-rc4
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.13.8

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
https://github.com/HackSpeak/ovswrap-poc

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry