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THREATINT
PUBLISHED

CVE-2024-49996

cifs: Fix buffer overflow when parsing NFS reparse points



Description

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().

Reserved 2024-10-21 | Published 2024-10-21 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

d5ecebc4900df7f6e8dff0717574668885110553 before 7b222d6cb87077faf56a687a72af1951cf78c8a9
affected

d5ecebc4900df7f6e8dff0717574668885110553 before 73b078e3314d4854fd8286f3ba65c860ddd3a3dd
affected

d5ecebc4900df7f6e8dff0717574668885110553 before 01cdddde39b065074fd48f07027757783cbf5b7d
affected

d5ecebc4900df7f6e8dff0717574668885110553 before ec79e6170bcae8a6036a4b6960f5e7e59a785601
affected

d5ecebc4900df7f6e8dff0717574668885110553 before c6db81c550cea0c73bd72ef55f579991e0e4ba07
affected

d5ecebc4900df7f6e8dff0717574668885110553 before 803b3a39cb096d8718c0aebc03fd19f11c7dc919
affected

d5ecebc4900df7f6e8dff0717574668885110553 before c173d47b69f07cd7ca08efb4e458adbd4725d8e9
affected

d5ecebc4900df7f6e8dff0717574668885110553 before e2a8910af01653c1c268984855629d71fb81f404
affected

Default status
affected

5.3
affected

Any version before 5.3
unaffected

5.4.287
unaffected

5.10.231
unaffected

5.15.174
unaffected

6.1.120
unaffected

6.6.55
unaffected

6.10.14
unaffected

6.11.3
unaffected

6.12
unaffected

References

git.kernel.org/...c/7b222d6cb87077faf56a687a72af1951cf78c8a9

git.kernel.org/...c/73b078e3314d4854fd8286f3ba65c860ddd3a3dd

git.kernel.org/...c/01cdddde39b065074fd48f07027757783cbf5b7d

git.kernel.org/...c/ec79e6170bcae8a6036a4b6960f5e7e59a785601

git.kernel.org/...c/c6db81c550cea0c73bd72ef55f579991e0e4ba07

git.kernel.org/...c/803b3a39cb096d8718c0aebc03fd19f11c7dc919

git.kernel.org/...c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9

git.kernel.org/...c/e2a8910af01653c1c268984855629d71fb81f404

cve.org (CVE-2024-49996)

nvd.nist.gov (CVE-2024-49996)

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