{"id":"CVE-2026-64258","state":"PUBLISHED","title":"fuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref\n\nIf a copy into the userspace ring buffer fails, a request will be\nterminated and fuse_uring_req_end() will set ent->fuse_req to NULL but\nit will leave the entry on ent_w_req_queue in FRRS_FUSE_REQ state. This\ncan lead to a NULL deref if the request expiration logic scans\nent_w_req_queue in the window before the entry is moved off it.\n\nFix this by taking the entry off ent_w_req_queue and changing its state\nfrom FRRS_FUSE_REQ to FRRS_INVALID before terminating the request.","publishedAt":"2026-07-25T08:49:10.093Z","updatedAt":"2026-08-17T04:52:11.332Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"0b466cf1b96e191b06b496c4de79da15315c3a9a","versionType":"git"},{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"0a7f33010c0e4cd92937e088a54350381fd0fbf2","versionType":"git"},{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"1c57a69be962d459c5e705f5cb4355b841b3461c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev_uring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev_uring.c"]}],"references":["https://git.kernel.org/stable/c/0b466cf1b96e191b06b496c4de79da15315c3a9a","https://git.kernel.org/stable/c/0a7f33010c0e4cd92937e088a54350381fd0fbf2","https://git.kernel.org/stable/c/1c57a69be962d459c5e705f5cb4355b841b3461c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64258.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64258","state":"PUBLISHED","datePublished":"2026-07-25T08:49:10.093Z","dateUpdated":"2026-08-17T04:52:11.332Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.773Z"},"containers":{"cna":{"title":"fuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref\n\nIf a copy into the userspace ring buffer fails, a request will be\nterminated and fuse_uring_req_end() will set ent->fuse_req to NULL but\nit will leave the entry on ent_w_req_queue in FRRS_FUSE_REQ state. This\ncan lead to a NULL deref if the request expiration logic scans\nent_w_req_queue in the window before the entry is moved off it.\n\nFix this by taking the entry off ent_w_req_queue and changing its state\nfrom FRRS_FUSE_REQ to FRRS_INVALID before terminating the request."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"0b466cf1b96e191b06b496c4de79da15315c3a9a","versionType":"git"},{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"0a7f33010c0e4cd92937e088a54350381fd0fbf2","versionType":"git"},{"version":"4fea593e625cd50d4d11be227007849b12f17bfb","status":"affected","lessThan":"1c57a69be962d459c5e705f5cb4355b841b3461c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev_uring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fuse/dev_uring.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0b466cf1b96e191b06b496c4de79da15315c3a9a"},{"url":"https://git.kernel.org/stable/c/0a7f33010c0e4cd92937e088a54350381fd0fbf2"},{"url":"https://git.kernel.org/stable/c/1c57a69be962d459c5e705f5cb4355b841b3461c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:52:11.332Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}