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CVE-2026-72163

UnknownEPSS 0.21%

Last modified

CVE-2026-72163 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits [BUG] A direct write over unwritten extents can panic the kernel in ocfs2_assure_trans_credits() when the journal aborts during DIO completion. The crash is a general protection fault from a NULL pointer dereference. [CAUSE] ocfs2_dio_end_io_write() loops over a direct write's unwritten extents, marking each written under a single journal handle. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits [BUG] A direct write over unwritten extents can panic the kernel in ocfs2_assure_trans_credits() when the journal aborts during DIO completion. The crash is a general protection fault from a NULL pointer dereference. [CAUSE] ocfs2_dio_end_io_write() loops over a direct write's unwritten extents, marking each written under a single journal handle. If the journal aborts (for example after an I/O error) while the extent tree is being updated, the handle is left aborted with its transaction pointer cleared. The extent merge treats that failure as not critical and reports success, so the loop keeps using the handle. ocfs2_assure_trans_credits() reads the handle's remaining credits without first checking whether the handle is aborted, and that read dereferences the cleared transaction pointer. [FIX] A journal abort is recorded in the handle itself, so callers are expected to test the handle rather than rely on a returned error. Make ocfs2_assure_trans_credits() do that, as the other ocfs2 journal helpers already do, and return -EROFS when the handle is aborted.

Metrics

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= a68b896aa56e435506453ec8835bc991ec3ae687, < 2d80e9c56718435a9c9f5f24dbc954989aead579; >= 320273b5649bbcee87f9e65343077189699d2a7a, < 942b818b396c24c452681803ff291552317d2ef1; >= 9ea2d1c6789722d58ec191f14f9a02518d55b6b4, < 7146d191dae3a8efdb957993fb61a55713186266; >= c05ffb693bfb42a48ef3ee88a55b57392984e111, < f14aaaa130356ee4adb44de947c098637c70df8f; >= be346c1a6eeb49d8fda827d2a9522124c2f72f36, < 6ad7532a23bc94076efe9f1486dd7f7493c090ff; >= be346c1a6eeb49d8fda827d2a9522124c2f72f36, < bd73971fad89d5ee4ea0ba9b92d2ea08733c4a64; >= be346c1a6eeb49d8fda827d2a9522124c2f72f36, < 253ed993e0b36997ec7b04c1ff76103b38241de2; >= be346c1a6eeb49d8fda827d2a9522124c2f72f36, < f9ab30c96b0f00c20c6dac93681bdae3a033d229; 331d1079d58206ff7dc5518185f800b412f89bc6; >= 5.10.221, < 5.10.261; >= 5.15.162, < 5.15.212; >= 6.1.97, < 6.1.178; >= 6.6.37, < 6.6.145; >= 6.9.8, < 6.10
LinuxLinux6.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72163?
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits [BUG] A direct write over unwritten extents can panic the kernel in ocfs2_assure_trans_credits() when the journal aborts during DIO completion. The crash is a general protection fault from a NULL pointer dereference. [CAUSE] ocfs2_dio_end_io_write() loops over a direct write's unwritten extents, marking each written under a single journal handle. If the journal aborts (for example after an I/O error) while the extent tree is being updated, the handle is left aborted with its transaction pointer cleared. The extent merge treats that failure as not critical and reports success, so the loop keeps using the handle. ocfs2_assure_trans_credits() reads the handle's remaining credits without first checking whether the handle is aborted, and that read dereferences the cleared transaction pointer. [FIX] A journal abort is recorded in the handle itself, so callers are expected to test the handle rather than rely on a returned error. Make ocfs2_assure_trans_credits() do that, as the other ocfs2 journal helpers already do, and return -EROFS when the handle is aborted.
How severe is CVE-2026-72163?
Severity scoring for CVE-2026-72163 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72163?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST