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CVE-2024-42079: gfs2: Fix NULL pointer dereference in gfs2_log_flush

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-29 · updated 2026-10-15
• Weakness: CWE-476

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).

Affected products

• Linux kernel: before 6.6.37; from 6.7 before 6.9.8 — fixed in 6.6.37, 6.9.8

How to fix

Upgrade to a fixed version: Linux kernel 6.6.37, 6.9.8. Check the vendor advisory for mitigations.

References

• 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
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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