CVE-2024-49996: cifs: Fix buffer overflow when parsing NFS reparse points
First published: Mon Oct 21 2024(Updated: )
In 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().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.3<6.6.55 | |
| Linux Linux kernel | >=6.7<6.10.14 | |
| Linux Linux kernel | >=6.11<6.11.3 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/803b3a39cb096d8718c0aebc03fd19f11c7dc919
- https://git.kernel.org/stable/c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9
- https://git.kernel.org/stable/c/c6db81c550cea0c73bd72ef55f579991e0e4ba07
- https://git.kernel.org/stable/c/e2a8910af01653c1c268984855629d71fb81f404
- https://git.kernel.org/stable/c/7b222d6cb87077faf56a687a72af1951cf78c8a9
- https://git.kernel.org/stable/c/73b078e3314d4854fd8286f3ba65c860ddd3a3dd
- https://git.kernel.org/stable/c/01cdddde39b065074fd48f07027757783cbf5b7d
- https://git.kernel.org/stable/c/ec79e6170bcae8a6036a4b6960f5e7e59a785601
- agent/title
- agent/description
- agent/first-publish-date
- agent/type
- agent/author
- agent/event
- agent/severity
- agent/remedy
- agent/weakness
- agent/softwarecombine
- agent/references
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/5.3
- version/linux linux kernel/6.7
- version/linux linux kernel/6.11