{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64260", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.774Z", "datePublished": "2026-07-25T08:49:11.395Z", "dateUpdated": "2026-08-05T12:40:21.406Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:40:21.406Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: Avoid queue->stopped races and set/read that value under lock\n\nThere are several readers of queue->stopped that check the value\nunder lock, but fuse_uring_commit_fetch() did not and actually\nthe value was not set under the lock in fuse_uring_abort_end_requests()\neither. Especially in fuse_uring_commit_fetch it is important\nto check under a lock, because due to races 'struct fuse_req'\nmight be freed with fuse_request_end, but another thread/cpu\nmight already do teardown work."}], "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 flaw is reached locally by submitting IORING_OP_URING_CMD/FUSE_IO_URING_CMD_COMMIT_AND_FETCH operations on an attached /dev/fuse descriptor.\nAC:L - Once FUSE-over-io-uring is enabled, the attacker controls both race participants by issuing commit SQEs while concurrently aborting or unmounting the connection.\nPR:L - An ordinary user can create a FUSE mount through FS_USERNS_MOUNT and user namespaces, submit commands through /dev/fuse, and access the user-owned fusectl abort control without init-namespace capabilities.\nUI:N - The attacker can create the mount, generate FUSE requests, submit commits, and trigger teardown without another user's participation.\nS:U - This is a standard local kernel privilege-escalation condition within the kernel's security authority, not a guest-to-host or IOMMU boundary escape.\nC:H - The race causes a fuse_req use-after-free and double-end with stale list, pointer, and refcount accesses, which can be leveraged to disclose arbitrary kernel memory.\nI:H - Teardown writes through stale list pointers, flags, error fields, and refcounts and can corrupt or double-free a reallocated fuse_req, enabling arbitrary kernel writes or control-flow hijacking.\nA:H - The use-after-free, list corruption, and double-ending of requests can cause an oops, panic, deadlock, or complete system compromise."}]}], "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": "39c8e925b207afceffaa5382416ed405e0223a03", "status": "affected", "versionType": "git"}, {"version": "4a9bfb9b6850fec0685447aed280533cf980de70", "lessThan": "4021a3a79eee551d95fe1e1e7c1b195d34ba8c08", "status": "affected", "versionType": "git"}, {"version": "4a9bfb9b6850fec0685447aed280533cf980de70", "lessThan": "b70a3aca16934c196f92abb17b01c1647b9bb63c", "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-rc1", "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-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/39c8e925b207afceffaa5382416ed405e0223a03"}, {"url": "https://git.kernel.org/stable/c/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08"}, {"url": "https://git.kernel.org/stable/c/b70a3aca16934c196f92abb17b01c1647b9bb63c"}], "title": "fuse-uring: Avoid queue->stopped races and set/read that value under lock", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/fuse/dev_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "39c8e925b207afceffaa5382416ed405e0223a03", "status": "affected", "version": "4a9bfb9b6850fec0685447aed280533cf980de70", "versionType": "git"}, {"lessThan": "4021a3a79eee551d95fe1e1e7c1b195d34ba8c08", "status": "affected", "version": "4a9bfb9b6850fec0685447aed280533cf980de70", "versionType": "git"}, {"lessThan": "b70a3aca16934c196f92abb17b01c1647b9bb63c", "status": "affected", "version": "4a9bfb9b6850fec0685447aed280533cf980de70", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/fuse/dev_uring.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A14068C8-C11C-44AA-9581-F8861BC66FF8", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: Avoid queue->stopped races and set/read that value under lock\n\nThere are several readers of queue->stopped that check the value\nunder lock, but fuse_uring_commit_fetch() did not and actually\nthe value was not set under the lock in fuse_uring_abort_end_requests()\neither. Especially in fuse_uring_commit_fetch it is important\nto check under a lock, because due to races 'struct fuse_req'\nmight be freed with fuse_request_end, but another thread/cpu\nmight already do teardown work."}], "id": "CVE-2026-64260", "lastModified": "2026-08-12T15:52:56.543", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:06.137", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39c8e925b207afceffaa5382416ed405e0223a03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b70a3aca16934c196f92abb17b01c1647b9bb63c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fuse-uring: Avoid queue->stopped races and set/read that value under lock", "id": "2507039", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507039"}, "csaw": false, "cwe": "CWE-413", "details": ["A flaw was found in the `fuse-uring` component of the Linux kernel. A race condition exists where the `queue->stopped` flag is not consistently checked under a lock. This can allow a `struct fuse_req` to be prematurely freed while other operations are still in progress, potentially leading to memory corruption. A local attacker could exploit this vulnerability to cause system instability or potentially escalate privileges."], "name": "CVE-2026-64260", "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64260\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64260\nhttps://lore.kernel.org/linux-cve-announce/2026072557-CVE-2026-64260-f7d4@gregkh/T"]}

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