{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64265","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.774Z","datePublished":"2026-07-25T08:49:14.548Z","dateUpdated":"2026-08-17T04:52:19.015Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:52:19.015Z"},"descriptions":[{"lang":"en","value":"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->processing back to\nfiq->pending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq->interrupts.  If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq->interrupts.  When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq->pending 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->interrupts:\n  - list_del_init(&req->intr_entry) -> UAF write on freed slab\n  - req->in.h.unique -> UAF read, data leaked to userspace\n\nRemove intr_entry from fiq->interrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq->pending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerability is reached through local filesystem, signal, and read/write syscalls involving an attached /dev/fuse descriptor. No network or physical input directly reaches the vulnerable functions.\nAC:L - A malicious FUSE daemon can deterministically withhold a request, signal its client, issue FUSE_NOTIFY_RESEND, deliver a fatal signal, and read the stale interrupt. Polling permits synchronization without depending on an uncontrollable race.\nPR:L - Normal FUSE supports user-namespace and non-privileged mounts, while opening the FUSE device has no kernel capability check. An ordinary user can control both the daemon and client processes in a reasonable deployment.\nUI:N - All triggering operations can be performed programmatically by attacker-controlled daemon and client processes. No separate victim must mount or access the filesystem.\nS:U - Exploitation compromises the same kernel security authority in which the vulnerable FUSE code executes. This is a standard local kernel privilege escalation rather than a guest-to-host boundary escape.\nC:H - fuse_read_interrupt() reads req->in.h.unique from freed slab memory and copies it to userspace. Slab reuse or cache merging can expose replacement-object contents through this UAF read.\nI:H - list_del_init() interprets freed or reused intr_entry pointers as live list links and writes through them as well as into the freed object. Heap grooming can leverage this memory corruption for arbitrary writes or control-flow compromise.\nA:H - The stale list pointers and UAF writes can corrupt kernel queues or slab objects and cause an oops or panic. The attacker can repeat the deterministic trigger sequence."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev.c"],"versions":[{"version":"760eac73f9f69aa28fcb3050b4946c2dcc656d12","lessThan":"1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c","status":"affected","versionType":"git"},{"version":"760eac73f9f69aa28fcb3050b4946c2dcc656d12","lessThan":"7366e6f4d2b4c7002b13fb01219e83679dad4127","status":"affected","versionType":"git"},{"version":"760eac73f9f69aa28fcb3050b4946c2dcc656d12","lessThan":"893479015cb6442fd389d3b553ab3036c9541715","status":"affected","versionType":"git"},{"version":"760eac73f9f69aa28fcb3050b4946c2dcc656d12","lessThan":"f8fce75fedf73ac72aa09163deb8f4291fdcaad2","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.12.96","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"},{"url":"https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127"},{"url":"https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715"},{"url":"https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2"}],"title":"fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req","x_generator":{"engine":"bippy-1.2.0"}}}}