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CRITICAL

CVE-2024-49996

CVSS v3

9.4

CRITICAL

EPSS Score

0.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • linuxUbuntu:24.10all versions · fixed in 6.11.0-18.18
  • linux-awsUbuntu:24.10all versions · fixed in 6.11.0-1009.10
  • linux-gcpUbuntu:24.10all versions · fixed in 6.11.0-1009.9and 1 other package
  • linux-lowlatencyUbuntu:24.10all versions · fixed in 6.11.0-1010.11
  • linux-oracleUbuntu:24.10all versions · fixed in 6.11.0-1011.12
  • linux-raspiUbuntu:24.10all versions · fixed in 6.11.0-1008.8
  • linux-realtimeUbuntu:24.10all versions · fixed in 6.11.0-1005.5

Vendor advisories

  • CVE-2024-49996 Red Hat Product Security76 known affected

    kernel: cifs: Fix buffer overflow when parsing NFS reparse points

    bpftool as a component of Red Hat Enterprise Linux 7 · kernel as a component of Red Hat Enterprise Linux 7 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 7

Full record on NVD

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().

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Published
2024-10-21
Last Modified
2026-08-04

Frequently asked questions

What is CVE-2024-49996?

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().

Is CVE-2024-49996 actively exploited?

Active exploitation of CVE-2024-49996 has not been confirmed. Its EPSS score was 0.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-49996?

CVE-2024-49996 has a CVSS v3 base score of 9.4 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H.

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