CVE-2026-68119tcp: initialize standalone TCP-AO response padding
- 7.5HighCVSS base score
- 0.37%Exploitation in 30 daysEPSS · top 68% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 7 days later
· 7 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.37% · top 68% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected decde2586b34b99684faff1eab41e5c496c27fb6 – < bbb7db8c74b0b5d17a695136f0f0806ecd0118f6
- affected decde2586b34b99684faff1eab41e5c496c27fb6 – < fadaff3f66e124c3a62237f9c881819a8ac90309
- affected decde2586b34b99684faff1eab41e5c496c27fb6 – < a859b280441fb02f64ed4037f03d5c0c34a7a595
- affected decde2586b34b99684faff1eab41e5c496c27fb6 – < e1a9d3cc11829c5414a75eb39c704f461936eb24
- affected 6.7
- unaffected < 6.7
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6 (opens in a new tab)
- https://git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309 (opens in a new tab)
- https://git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595 (opens in a new tab)
- https://git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55500 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68119)Record last updated .