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CVE-2026-63867

In the Linux kernel, the following vulnerability has been resolved: mptcp: close TOCTOU race while computing rcv_wnd The MPTCP output path access locklessly the MPTCP-level ack_seq in multiple times, using possibly different values for the data_ack in the DSS option and to compute the announced rcv wnd for the same packet. Refactor the cote to avoid inconsistencies which may confuse the peer. Also ensure that the MPTCP level rcv wnd is updated only when the egress packet actually contains a D
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b287253cca8698673a69dd98516ac9a759b75255c02b1abba92374fefe3299b3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["net/mptcp/options.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.11"},{"lessThan":"5.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrE…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mptcp/options.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"301a33fd590c408a05c5df800e0cc1e6a8a2f8f8","status":"affected","version":"fa3fe2b150316b294f2c662653501273ff25bba8","versionType":"git"},{"lessThan":"68364963e5baf03f16b4420292291f75c8f66497","status":"affected","version":"fa3fe2b150316b294f2c662653501273ff25bba8","versionType":"git"},{"lessThan":"907ac6b1658e0277f979fcdfae2a753b495c1510","status":"affected","version":"fa3fe2b150316b294f2c662653…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["net/mptcp/options.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.11"},{"lessThan":"5.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrE…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mptcp/options.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"301a33fd590c408a05c5df800e0cc1e6a8a2f8f8","status":"affected","version":"fa3fe2b150316b294f2c662653501273ff25bba8","versionType":"git"},{"lessThan":"68364963e5baf03f16b4420292291f75c8f66497","status":"affected","version":"fa3fe2b150316b294f2c662653501273ff25bba8","versionType":"git"},{"lessThan":"907ac6b1658e0277f979fcdfae2a753b495c1510","status":"affected","version":"fa3fe2b150316b294f2c662653…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/metrics/0/cvssV3_1

Source references

7 source assertions
{"url":"https://git.kernel.org/stable/c/301a33fd590c408a05c5df800e0cc1e6a8a2f8f8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/3b8cbba7c0ed31189c89f90be247b8973ffa79ef"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/68364963e5baf03f16b4420292291f75c8f66497"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/8ab24fdebc369c0dfb90f82c1650b1e66662bb45"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/8f4f0a157e8436a05bf8c3670b24dbc258911c43"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/907ac6b1658e0277f979fcdfae2a753b495c1510"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/c4f4cf60797974873dbc8e100144682a6f2f861f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a16a95d4354cee7444e9022cc7e1b98dcd64a485d0e3dc5e12bf8ddb3eae364a · sha256:5ae5a7b57a37fe92… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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