CVE-2024-42079: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix NULL pointer dereference in gfs2_log_flush In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush lock to provide exclusion against gfs2_log_flush(). In gfs2_log_flush(), check if sdp->sd_jdesc is non-NULL before dereferencing it. Otherwise, we could run into a NULL pointer dereference when outstanding glock work races with an unmount (glock_work_func -> run_queue -> do_xmote -> inode_go_sync -> gfs2_log_flush).

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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	< 6.6.37
linux	linux_kernel	6.7 — 6.9.8

References

Advisories & Patches

https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828 https://git.kernel.org/stable/c/5f6a84cfb33b34610623857bd93919dcb661e29b https://git.kernel.org/stable/c/c3c5cfa3170c0940bc66a142859caac07d19b9d6 https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828 https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef

Frequently Asked Questions

What is CVE-2024-42079? +

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix NULL pointer dereference in gfs2_log_flush In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush lock to provide exclusion against gfs2_log_flush(). In gfs2_log_flush(), check if sdp->sd_jdesc is non-NULL before dereferencing it. Otherwise, we could run into a NULL pointer dereference when outstanding glock work races with an unmount (glock_work_func -> run_queue -> do_xmote -> inode_go_sync -> gfs2_log_flush). It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-42079? +

CVE-2024-42079 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-2024-42079? +

CVE-2024-42079 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-2024-42079? +

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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