{"id":"CVE-2026-53381","summary":"virtiofs: fix UAF on submount umount","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtiofs: fix UAF on submount umount\n\niput() called from fuse_release_end() can Oops if the super block has\nalready been destroyed.  Normally this is prevented by waiting for\nnum_waiting to go down to zero before commencing with super block shutdown.\n\nThis only works, however, for the last submount instance, as the wait\ncounter is per connection, not per superblock.\n\nRevert to using synchronous release requests for the auto_submounts case,\nwhich is virtiofs only at this time.","modified":"2026-07-23T09:59:40.424066649Z","published":"2026-07-19T11:59:30.469Z","related":["openSUSE-SU-2026:11339-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53381.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53381.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53381"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"548e1f2bac1d4df91a6138f26bb4ab00323fd948"},{"fixed":"607a1d4c42f649e6197567c0448fd9ebb316cd42"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cfd1aa3e2b71f3327cb373c45a897c9028c62b35"},{"fixed":"1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"83b375c6efef69b1066ad2d79601221e7892745a"},{"fixed":"0b809199ff87c44487e516a725dd4be2185712ce"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bfd17b6138df0122a95989457d8e18ce0b86165e"},{"fixed":"2181a09ba980f142650fb053666350ead4471cfe"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b26923512dbe57ae4917bafd31396d22a9d1691a"},{"fixed":"97c4691653d145dcc699eca5d3aba3219a520f1f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"26e5c67deb2e1f42a951f022fdf5b9f7eb747b01"},{"fixed":"2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"},{"fixed":"39a2b95e008665c14f84e50ed411d898df7cd11b"},{"fixed":"e09412a714bcd49375198427bb4aa005037a9d6f"},{"fixed":"06b41351779e9289e8785694ade9042ae85e41ea"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"f19a1390af448d9e193c08e28ea5f727bf3c3049"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.246"},{"fixed":"5.10.260"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.196"},{"fixed":"5.15.211"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.158"},{"fixed":"6.1.177"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.115"},{"fixed":"6.6.144"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.54"},{"fixed":"6.12.95"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.17.4"},{"fixed":"6.18"}]}],"versions":["v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.15.210","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v6.1.176","v6.1.175","v6.1.174","v6.1.173","v6.1.172","v6.1.171","v6.1.170","v6.1.169","v6.1.168","v6.1.167","v6.1.166","v6.1.165","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.6.143","v6.6.142","v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.6.129","v6.6.128","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.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