CVE Explorer

CVE-2026-64399

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE The FSCTL_DUPLICATE_EXTENTS_TO_FILE arm of smb2_ioctl() overwrites the destination file's data via vfs_clone_file_range() with neither the share-level KSMBD_TREE_CONN_FLAG_WRITABLE check nor a per-handle fp->daccess check that the other write-bearing arms carry. A client can overwrite destination data on a read-only share, or from a handle opened with only FILE_W

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:437d302284d026ca06ad0458992f0535f0e4685f9eee66181b0461c20b482512

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"bf460ad5958d506492de4524a656439da3f99c51","status":"affected","version":"eb817368f50c1cbe1bd07044124aad7db6330e3a","versionType":"git"},{"lessThan":"620d133d469295ee7c017ca6aafac335f65c4a5a","status":"affected","version":"eb817368f50c1cbe1bd07044124aad7db6330e3a","versionType":"git"},{"lessThan":"9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6","status":"affected","version":"eb817368f50c1cbe1bd070…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.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":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThan…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/affected/1

Affected products and versions

2 source assertions

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/affected/0

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion

{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/metrics/0/cvssV3_1

Source references

6 source assertions

{"url":"https://git.kernel.org/stable/c/388e4139db27a9e3612c9d356b826f5b1ff6a9e3"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/5

{"url":"https://git.kernel.org/stable/c/620d133d469295ee7c017ca6aafac335f65c4a5a"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/1

{"url":"https://git.kernel.org/stable/c/9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/2

{"url":"https://git.kernel.org/stable/c/baae7b39673ec21073a25e3d14f8feaada01d5df"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/3

{"url":"https://git.kernel.org/stable/c/bf460ad5958d506492de4524a656439da3f99c51"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/0

{"url":"https://git.kernel.org/stable/c/c917e4522d251071dde9871b9142d8ea1186ebfe"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ec95ff8c9f00bf8f4dd8cde23c1bdd6c5190dfac3a7ec8d0a3de1b612cda1f4d · sha256:1c3f32ad5ccbc49c… · /containers/cna/references/4

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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