CVE-2026-97949

CVE CVE-2026-97949EUVD EUVD-2026-86803Published 2026-09-25T10:22:58.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: configfs: unhash the dentry before dropping the item in rmdir configfs_get_config_item() treats a hashed dentry as proof that sd->s_element is a live config_item. configfs_rmdir() breaks that: simple_rmdir() leaves the dentry hashed, the last reference to the item is dropped right after, and the dentry is only unhashed by d_delete() once ->rmdir() has returned. configfs_symlink() resolves its target holding no lock on it, so get_target() can land in that window: BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90 get_target fs/configfs/symlink.c:128 [inline] configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185 Unhash in configfs_remove_dir(), while the item is still guaranteed to be there. A reference obtained just before that stays harmless, as create_link() rechecks CONFIGFS_USET_DROPPING, already set by configfs_detach_prep(). Both configfs_unregister_subsystem() paths d_drop() after detaching, so this only makes rmdir match them.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.2.7; 7063fbf2261194f72ee75afca67b3b38b554b5fa <925d8564f1b2d9b46c5ab63b9bc942cea006da9b; patch: 6.18.53; 2.6.16; 7063fbf2261194f72ee75afca67b3b38b554b5fa <f06c2d26d1999d37e93299db0ecead04ca7d0b9f; 7063fbf2261194f72ee75afca67b3b38b554b5fa <5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb; patch: 7.3-rc3; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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