{"id":"CVE-2026-97562","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: pin DFS superblock in iterator callback\n\ntcon_super_cb() stores a raw superblock pointer, but __cifs_get_super()\ntakes its active reference only after iter…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: pin DFS superblock in iterator callback\n\ntcon_super_cb() stores a raw superblock pointer, but __cifs_get_super()\ntakes its active reference only after iter…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= bacd704a95ad0b93af995aae4a523aa046f46563 < ea43a15cea36dc5ddd832be5bddeac7dd804cbcf","Linux >= bacd704a95ad0b93af995aae4a523aa046f46563 < a6b6561522212af852c9ad8a7dca8d59ef2c7377","Linux >= bacd704a95ad0b93af995aae4a523aa046f46563 < 5b01a8c0209690db75341528ec53fd87e0ac1460","Linux >= bacd704a95ad0b93af995aae4a523aa046f46563 < d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818","Linux 5.7"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T15:17:59.183","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97562","references":[{"url":"https://git.kernel.org/stable/c/5b01a8c0209690db75341528ec53fd87e0ac1460","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a6b6561522212af852c9ad8a7dca8d59ef2c7377","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ea43a15cea36dc5ddd832be5bddeac7dd804cbcf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.915Z","slug":"CVE-2026-97562","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: pin DFS superblock in iterator callback\n\ntcon_super_cb() stores a raw superblock pointer, but __cifs_get_super()\ntakes its active reference only after iterate_supers_type() has dropped\ns_umount and its passive reference. Concurrent DFS automount expiry can\ntherefore free the superblock before cifs_sb_active() uses it.\n\nA deterministic KASAN test reproduces the race as:\n\n  BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80\n\nThe same test passes with this change applied.\n\nTake the active reference in the callback while iterate_supers_type()\nstill holds s_umount shared. cifs_put_tcp_super() remains the matching\nrelease.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210998,"id":"CVE-2026-97562","ts":1790349122500,"field":"cvss","old":null,"new":"7.5"},{"seq":210997,"id":"CVE-2026-97562","ts":1790349122500,"field":"severity","old":"none","new":"high"}]}