{"id":"CVE-2026-64265","summary":"fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq-\u003eprocessing back to\nfiq-\u003epending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq-\u003einterrupts.  If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq-\u003einterrupts.  When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq-\u003epending and frees it\nvia the refcount path, also without cleaning intr_entry.  The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq-\u003einterrupts:\n  - list_del_init(&req-\u003eintr_entry) -\u003e UAF write on freed slab\n  - req-\u003ein.h.unique -\u003e UAF read, data leaked to userspace\n\nRemove intr_entry from fiq-\u003einterrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq-\u003epending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction.","modified":"2026-08-18T03:31:29.334202656Z","published":"2026-07-25T08:49:14.548Z","related":["CGA-645h-6j87-fhjh","openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64265.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127"},{"type":"WEB","url":"https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64265.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64265"},{"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":"760eac73f9f69aa28fcb3050b4946c2dcc656d12"},{"fixed":"1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"},{"fixed":"7366e6f4d2b4c7002b13fb01219e83679dad4127"},{"fixed":"893479015cb6442fd389d3b553ab3036c9541715"},{"fixed":"f8fce75fedf73ac72aa09163deb8f4291fdcaad2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64265.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64265.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}