Buffer Overflow Affecting kernel package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNEL-8240775
- published 22 Oct 2024
- disclosed 21 Oct 2024
Introduced: 21 Oct 2024
CVE-2024-49996 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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().
References
- https://access.redhat.com/security/cve/CVE-2024-49996
- 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