CVE-2026-23410

Description

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.

PUBLISHED Reserved 2026-01-13 | Published 2026-04-01 | Updated 2026-05-11 | Assigner Linux

Product status

References

git.kernel.org/...c/3b8e77c7abab40e6de9ad9de730d77984a498840

git.kernel.org/...c/d9d8560b9b7932f8cffc4c068c14289220900f79

git.kernel.org/...c/6b6ba87579c7e7c669e0bec91823e7fb693bc5df

git.kernel.org/...c/6ef1f2926c41ab96952d9696d55a052f1b3a9418

git.kernel.org/...c/f9761add6d100962a23996cb68f3d6abdd4d1815

git.kernel.org/...c/af782cc8871e3683ddd5a3cd2f7df526599863a9

git.kernel.org/...c/763e838adc3c7ec5a7df2990ce84cad951e42721

git.kernel.org/...c/a0b7091c4de45a7325c8780e6934a894f92ac86b

cve.org (CVE-2026-23410)

nvd.nist.gov (CVE-2026-23410)

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