{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64266", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.775Z", "datePublished": "2026-07-25T08:49:15.142Z", "dateUpdated": "2026-10-19T20:28:16.797Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:52:20.108Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning. fuse_chan_abort() can end the request and the async end\ncallback (eg fuse_writepage_free()) can free the args while the\nsubsequent copy chain logic after fuse_ref_folio() accesses them,\nleading to use-after-free issues.\n\nFix this by locking the request in fuse_ref_folio() before returning." } ], "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 - A local attacker reaches the flaw by serving a self-created FUSE mount and invoking splice() on its associated /dev/fuse descriptor.\nAC:L - The attacker controls writeback generation, splice processing, and concurrent connection abort, allowing repeated attempts at the race without an uncontrollable prerequisite.\nPR:L - FUSE supports user-namespace mounts, and an unprivileged mount owner can operate /dev/fuse and abort their own connection without init-namespace root.\nUI:N - The attacker can create and exercise their own FUSE connection without any victim action.\nS:U - Exploitation compromises the kernel within the same operating-system security authority and does not inherently cross a virtualization boundary.\nC:H - The freed argument and folio arrays are subsequently dereferenced, permitting attacker-influenced stale folio pointers and potential arbitrary kernel-memory disclosure through pipe buffers.\nI:H - Heap reclamation can replace the freed folio pointers and loop metadata, enabling attacker-directed memory or refcount operations that may support arbitrary writes and kernel code execution.\nA:H - The repeatable use-after-free and invalid folio operations can cause an oops, panic, or other complete system failure." } ] } ], "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": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "1f9156714592356b4fda57beac7eab9c2a462dd3", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "5630da218a45ba80f0aba0846cbe8aa655da122b", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "1ca605cfa59377f0143fb35b5b01360f37d1b7c4", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "0e4a5a000123d81234e27a2f8187688cf608f755", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "e6aa539720c3d8def69683ed0c07cf9faea4e8be", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "be353caffa8640f5e25fb3714ce8b0cef5e410e5", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "65a1c2551f7e16085acbb54aedde1feaa559ba7a", "status": "affected", "versionType": "git" }, { "version": "c3021629a0d820247ee12b6c5192a1d5380e21c6", "lessThan": "b5befa80fdbe287a98480effed9564712924add5", "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": "2.6.35", "status": "affected" }, { "version": "0", "lessThan": "2.6.35", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "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": "2.6.35", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3" }, { "url": "https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b" }, { "url": "https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4" }, { "url": "https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755" }, { "url": "https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be" }, { "url": "https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5" }, { "url": "https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a" }, { "url": "https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5" } ], "title": "fuse: re-lock request before returning from fuse_ref_folio()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-64266", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:38:01.546912Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:28:16.797Z" } } ] } }