CVE-2024-49877: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix possible null-ptr-deref in ocfs2_set_buffer_uptodate When doing cleanup, if flags without OCFS2_BH_READAHEAD, it may trigger NULL pointer dereference in the following ocfs2_set_buffer_uptodate() if bh is NULL.

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.20 — 5.10.227
linux	linux_kernel	5.11 — 5.15.168
linux	linux_kernel	5.16 — 6.1.113
linux	linux_kernel	6.2 — 6.6.55
linux	linux_kernel	6.7 — 6.10.14
linux	linux_kernel	6.11 — 6.11.3
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/01cb2e751cc61ade454c9bc1aaa2eac1f8197112 https://git.kernel.org/stable/c/33b525cef4cff49e216e4133cc48452e11c0391e https://git.kernel.org/stable/c/46b1edf0536a5291a8ad2337f88c926214b209d9 https://git.kernel.org/stable/c/4846e72ab5a0726e49ad4188b9d9df091ae78c64 https://git.kernel.org/stable/c/61b84013e560382cbe7dd56758be3154d43a3988 https://git.kernel.org/stable/c/d52c5652e7dcb7a0648bbb8642cc3e617070ab49 https://git.kernel.org/stable/c/df944dc46d06af65a75191183d52be017e6b9dbe

Other References

https://git.kernel.org/stable/c/190d98bcd61117a78fe185222d162180f061a6ca https://git.kernel.org/stable/c/e68c8323355e8cedfbe0bec7d5a39009f61640b6 https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-49877? +

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix possible null-ptr-deref in ocfs2_set_buffer_uptodate When doing cleanup, if flags without OCFS2_BH_READAHEAD, it may trigger NULL pointer dereference in the following ocfs2_set_buffer_uptodate() if bh is NULL. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-49877? +

CVE-2024-49877 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-49877? +

CVE-2024-49877 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-49877? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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