{"id":"CVE-2026-31597","summary":"ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY\n\nfilemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY,\nas documented in mm/filemap.c:\n\n  \"If our return value has VM_FAULT_RETRY set, it's because the mmap_lock\n  may be dropped before doing I/O or by lock_folio_maybe_drop_mmap().\"\n\nWhen this happens, a concurrent munmap() can call remove_vma() and free\nthe vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then\nbecomes a dangling pointer, and the subsequent trace_ocfs2_fault() call\ndereferences it -- a use-after-free.\n\nFix this by saving ip_blkno as a plain integer before calling\nfilemap_fault(), and removing vma from the trace event. Since\nip_blkno is copied by value before the lock can be dropped, it\nremains valid regardless of what happens to the vma or inode\nafterward.","modified":"2026-06-18T03:57:06.560051795Z","published":"2026-04-24T14:42:22.655Z","related":["CGA-726m-45h7-p6hc","openSUSE-SU-2026:10703-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31597.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76"},{"type":"WEB","url":"https://git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006"},{"type":"WEB","url":"https://git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921"},{"type":"WEB","url":"https://git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31597.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31597"},{"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":"614a9e849ca6ea24843795251cb30af525d5336b"},{"fixed":"36539c4d536f851a3b346a6ebb27b51bc3d77a94"},{"fixed":"35c2c05261d6f6d84aaa1355afa201d507943e76"},{"fixed":"3f5e74b5db9353b01ed50f4de84e75b755f8fbc2"},{"fixed":"6f072daefcab1d84ce37c073645615f63be91006"},{"fixed":"4cf2768a0291a0cdd0dae801ea0eafa3878a349d"},{"fixed":"d45ff441b416d4aa1af72b1db23d959601c04da2"},{"fixed":"76a602fdbb78dd05b2da06f74a988cebc97e82d0"},{"fixed":"925bf22c1b823e231b1baea761fe8a1512e442f2"},{"fixed":"7de554cabf160e331e4442e2a9ad874ca9875921"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31597.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.39"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.20.0"},{"fixed":"7.0.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31597.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}