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CVE-2026-64389

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate NTLMv2 response before updating session key ksmbd_auth_ntlmv2() derives the NTLMv2 session key into sess->sess_key before it verifies the NTLMv2 response. ksmbd_decode_ntlmssp_auth_blob() then continues into KEY_XCH even when ksmbd_auth_ntlmv2() failed. With SMB3 multichannel binding, the failed authentication operates on an existing session and the session setup error path does not expire binding sessions. A
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0a99ac86fa2223645ee7faefc27a84b764331ae5736a244ff2e900ade889da8f
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":["fs/smb/server/auth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/auth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b56400364aed5c34d6e1a0b493081290a5328a9c","status":"affected","version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","versionType":"git"},{"lessThan":"89ca7756d5566ba636bb9092cdbe57dab095e136","status":"affected","version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","versionType":"git"},{"lessThan":"954d196bebb2b50151cb96454c72dc113b2af1ac","status":"affected","version":"e2f34481b24db2fd634b5edb0…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/auth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/auth.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b56400364aed5c34d6e1a0b493081290a5328a9c","status":"affected","version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","versionType":"git"},{"lessThan":"89ca7756d5566ba636bb9092cdbe57dab095e136","status":"affected","version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","versionType":"git"},{"lessThan":"954d196bebb2b50151cb96454c72dc113b2af1ac","status":"affected","version":"e2f34481b24db2fd634b5edb0…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /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:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/metrics/0/cvssV3_1

Source references

3 source assertions
{"url":"https://git.kernel.org/stable/c/89ca7756d5566ba636bb9092cdbe57dab095e136"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/954d196bebb2b50151cb96454c72dc113b2af1ac"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/b56400364aed5c34d6e1a0b493081290a5328a9c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:214294ecaeffaac3bc232bf93e4db9097e0cb73119921d80ba6428ed5d28e03f · sha256:4211e0fad4fb3561… · /containers/cna/references/0

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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