CVE-2026-93073

Summary

In the Linux kernel, the following vulnerability has been resolved:

dax: read holder_ops once in dax_holder_notify_failure()

dax_holder_notify_failure() reads dax_dev->holder_ops twice without READ_ONCE() – once for the NULL check and once for the indirect notify_failure() call. A concurrent fs_put_dax() can clear holder_ops between the two reads, so the check can observe a non-NULL pointer while the call dereferences NULL. (kill_dax() also clears holder_ops, but only after synchronize_srcu(), so it cannot race a reader that is inside dax_read_lock(); fs_put_dax() does no such synchronization.)

Fetch holder_ops once into a local with READ_ONCE() so the NULL check and the indirect call observe the same value.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8012b866085523758780850087102421dbcce522 < 1661b9bf78def01a8c96409569772d9b2592f4baaffected
LinuxLinux8012b866085523758780850087102421dbcce522 < 0a42180d5410c98829ee72d1d426fb7faf9e6873affected
LinuxLinux8012b866085523758780850087102421dbcce522 < ee1251621d1c7cf3155c6704542cbb358d799968affected
LinuxLinux8012b866085523758780850087102421dbcce522 < 6a37acecc7c29136235cbc446a1b89e81414344baffected
LinuxLinux8012b866085523758780850087102421dbcce522 < eb412f80311fc7ab6eb3203091a3fe59a5e9fd30affected
LinuxLinux8012b866085523758780850087102421dbcce522 < 7ae9d15bdcde0f2955ae13b6a95587f9e23b2359affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References