cifs: Fix buffer overflow when parsing NFS reparse points

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-49996
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 18:15:19 UTC
Updated2026-06-15 18:24:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: Fix buffer overflow when parsing NFS reparse points ReparseDataLength is sum of the InodeType size and DataBuffer size. So to get DataBuffer size it is needed to subtract InodeType's size from ReparseDataLength. Function cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer at position after the end of the buffer because it does not subtract InodeType size from the length. Fix this problem and correctly subtract variable len. Member InodeType is present only when reparse buffer is large enough. Check for ReparseDataLength before accessing InodeType to prevent another invalid memory access. Major and minor rdev values are present also only when reparse buffer is large enough. Check for reparse buffer size before calling reparse_mkdev().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-120

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 7b222d6cb87077faf56a687a72af1951cf78c8a9 git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 73b078e3314d4854fd8286f3ba65c860ddd3a3dd git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 01cdddde39b065074fd48f07027757783cbf5b7d git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 ec79e6170bcae8a6036a4b6960f5e7e59a785601 git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 c6db81c550cea0c73bd72ef55f579991e0e4ba07 git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 803b3a39cb096d8718c0aebc03fd19f11c7dc919 git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 c173d47b69f07cd7ca08efb4e458adbd4725d8e9 git Not specified
CNA Linux Linux affected d5ecebc4900df7f6e8dff0717574668885110553 e2a8910af01653c1c268984855629d71fb81f404 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 5.4.287 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.231 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.174 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.120 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.55 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.14 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.3 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/7b222d6cb87077faf56a687a72af1951cf78c8a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e2a8910af01653c1c268984855629d71fb81f404 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/ec79e6170bcae8a6036a4b6960f5e7e59a785601 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/803b3a39cb096d8718c0aebc03fd19f11c7dc919 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c6db81c550cea0c73bd72ef55f579991e0e4ba07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/01cdddde39b065074fd48f07027757783cbf5b7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/73b078e3314d4854fd8286f3ba65c860ddd3a3dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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