CVE-2026-97562

CVE CVE-2026-97562EUVD EUVD-2026-86870Published 2026-09-25T10:21:50.000ZLast changed 2026-09-25T14:41:15.000ZCVSS 7.5

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: smb: client: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it. A deterministic KASAN test reproduces the race as: BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80 The same test passes with this change applied. Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.

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 bacd704a95ad0b93af995aae4a523aa046f46563 <5b01a8c0209690db75341528ec53fd87e0ac1460; patch: 7.3-rc3; patch: 6.12.111; bacd704a95ad0b93af995aae4a523aa046f46563 <ea43a15cea36dc5ddd832be5bddeac7dd804cbcf; patch: 7.2.7; patch: 6.18.53; 5.7; bacd704a95ad0b93af995aae4a523aa046f46563 <d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818; patch: 0; bacd704a95ad0b93af995aae4a523aa046f46563 <a6b6561522212af852c9ad8a7dca8d59ef2c7377

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

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Linux — Linux

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