{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64261","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.774Z","datePublished":"2026-07-25T08:49:11.999Z","dateUpdated":"2026-08-17T04:52:14.647Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:52:14.647Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: Avoid use-after-free in fuse_uring_async_stop_queues\n\nfuse_uring_async_stop_queues() might run when the last reference\non ring->queue_refs was already dropped.\n\nIn order to avoid an early destruction a reference on struct fuse_conn\nis now taken before starting fuse_uring_async_stop_queues() and that\nreference is only released when that delayed work queue terminates."}],"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 locally through IORING_OP_URING_CMD on a FUSE or CUSE device and connection teardown; no network path invokes it.\nAC:L - The attacker controls ring-entry creation or cancellation and closing the final channel, allowing both sides of the race to be driven and retried.\nPR:L - The vulnerable io_uring handler has no capability check, and a basic user can access a delegated FUSE/CUSE device; FUSE also supports unprivileged user-namespace mounts.\nUI:N - The attacker can create the connection, issue concurrent io_uring operations, and initiate teardown without any separate victim action.\nS:U - Exploitation compromises the same host kernel security authority; this is standard local kernel privilege escalation rather than a VM or IOMMU boundary escape.\nC:H - The stale delayed worker accesses reclaimed kmalloc-192 ring, queue, and list objects, allowing heap replacement to turn the UAF into kernel-memory disclosure primitives.\nI:H - The worker performs list and synchronization operations through freed, reclaimable pointers, making arbitrary writes or control-flow hijacking and kernel code execution defensible.\nA:H - The bug has produced a KASAN slab-use-after-free in asynchronous queue teardown and can cause a kernel oops, panic, or unrecoverable list corruption."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev_uring.c"],"versions":[{"version":"4a9bfb9b6850fec0685447aed280533cf980de70","lessThan":"23a356e0bd96c8d5fb3ddff069f692bf10cab5c1","status":"affected","versionType":"git"},{"version":"4a9bfb9b6850fec0685447aed280533cf980de70","lessThan":"95d7f50aff2a5f71557263ff25b97b2951f32bf8","status":"affected","versionType":"git"},{"version":"4a9bfb9b6850fec0685447aed280533cf980de70","lessThan":"d351da75066955144515cb2f9aa959f24a04287a","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_uring.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","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":"6.14","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/23a356e0bd96c8d5fb3ddff069f692bf10cab5c1"},{"url":"https://git.kernel.org/stable/c/95d7f50aff2a5f71557263ff25b97b2951f32bf8"},{"url":"https://git.kernel.org/stable/c/d351da75066955144515cb2f9aa959f24a04287a"}],"title":"fuse-uring: Avoid use-after-free in fuse_uring_async_stop_queues","x_generator":{"engine":"bippy-1.2.0"}}}}