tcp: initialize standalone TCP-AO response padding

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68119
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:19:56 UTC
Updated2026-08-10 13:19:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tcp: initialize standalone TCP-AO response padding tcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP responses with TCP-AO options. The option length carries the actual MAC length, but the TCP header length includes the option rounded up to a four-byte boundary. tcp_ao_hash_hdr() writes the MAC only. Thus, when the MAC length is not four-byte aligned, the one to three bytes after the MAC are left uninitialized and may be transmitted. For the normal TCP-AO hashing mode, those bytes also have to be initialized before computing the MAC. Initialize only the alignment padding in the TCP-AO branches, before hashing the header. Use TCPOPT_NOP, as in the normal TCP-AO output path. This avoids adding work to non-AO TCP responses while preserving a valid authenticated header.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected decde2586b34b99684faff1eab41e5c496c27fb6 bbb7db8c74b0b5d17a695136f0f0806ecd0118f6 git Not specified
CNA Linux Linux affected decde2586b34b99684faff1eab41e5c496c27fb6 fadaff3f66e124c3a62237f9c881819a8ac90309 git Not specified
CNA Linux Linux affected decde2586b34b99684faff1eab41e5c496c27fb6 a859b280441fb02f64ed4037f03d5c0c34a7a595 git Not specified
CNA Linux Linux affected decde2586b34b99684faff1eab41e5c496c27fb6 e1a9d3cc11829c5414a75eb39c704f461936eb24 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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