CVE-2026-98921
In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_do_mkdir() debug print ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to unlock on failure."), vfs_mkdir() calls end_creating() on the input dentry on failure and may replace it on success, so the post-call %pd can use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled. Print the dentry before the call and only the result afterward.
Affected versions
Linux kernel versions
6.19
and later are affected. Fixed in
7.2.9,
7.3
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-98921?
CVE-2026-98921 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.19 onward and has been patched in 7.2.9 and 7.3. CVE-2026-98921 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98921?
Yes. CVE-2026-98921 has been patched. Fixed versions include 7.2.9 and 7.3. If you are running Linux kernel 6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98921 actively exploited?
No. CVE-2026-98921 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.