Linux Kernel AppArmor: RAWDATA UAF via refcount race
CVE-2026-23410 Published on April 1, 2026
apparmor: fix race on rawdata dereference
In the Linux kernel, the following vulnerability has been resolved:
apparmor: fix race on rawdata dereference
There is a race condition that leads to a use-after-free situation:
because the rawdata inodes are not refcounted, an attacker can start
open()ing one of the rawdata files, and at the same time remove the
last reference to this rawdata (by removing the corresponding profile,
for example), which frees its struct aa_loaddata; as a result, when
seq_rawdata_open() is reached, i_private is a dangling pointer and
freed memory is accessed.
The rawdata inodes weren't refcounted to avoid a circular refcount and
were supposed to be held by the profile rawdata reference. However
during profile removal there is a window where the vfs and profile
destruction race, resulting in the use after free.
Fix this by moving to a double refcount scheme. Where the profile
refcount on rawdata is used to break the circular dependency. Allowing
for freeing of the rawdata once all inode references to the rawdata
are put.
Products Associated with CVE-2026-23410
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Affected Versions
Linux:- Version 5d5182cae40115c03933989473288e54afb39c7c and below 6ef1f2926c41ab96952d9696d55a052f1b3a9418 is affected.
- Version 5d5182cae40115c03933989473288e54afb39c7c and below f9761add6d100962a23996cb68f3d6abdd4d1815 is affected.
- Version 5d5182cae40115c03933989473288e54afb39c7c and below af782cc8871e3683ddd5a3cd2f7df526599863a9 is affected.
- Version 5d5182cae40115c03933989473288e54afb39c7c and below 763e838adc3c7ec5a7df2990ce84cad951e42721 is affected.
- Version 5d5182cae40115c03933989473288e54afb39c7c and below a0b7091c4de45a7325c8780e6934a894f92ac86b is affected.
- Version 4.13 is affected.
- Before 4.13 is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.77, <= 6.12.* is unaffected.
- Version 6.18.18, <= 6.18.* is unaffected.
- Version 6.19.8, <= 6.19.* is unaffected.
- Version 7.0-rc4, <= * is unaffected.