CVE-2026-43088

Summary

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

net: af_key: zero aligned sockaddr tail in PF_KEY exports

PF_KEY export paths use pfkey_sockaddr_size() when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, pfkey_sockaddr_fill() initializes only the first 28 bytes of struct sockaddr_in6, leaving the final 4 aligned bytes uninitialized.

Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain skb_put():

  • SADB_ACQUIRE
  • SADB_X_NAT_T_NEW_MAPPING
  • SADB_X_MIGRATE

Fix those paths by clearing only the aligned sockaddr tail after pfkey_sockaddr_fill().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3c19cb8a84ef709d57943bd6664cf31cb91ba6ecaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 11cbf294bac623bd57296f231199193087f57b4aaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < edd446ee7cd3d02cac246168063d5b3e9ea68460affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2e74f974359b5382ecbe8536abbb5b837eb6c724affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 426c355742f02cf743b347d9d7dbdc1bfbfa31efaffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.88 <= 6.12.*unaffected
LinuxLinux6.18.30 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References