{"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": "2026-08-05T12:40:24.619Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:40:24.619Z"}, "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-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": "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-rc1"}]}]}], "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"}}}}

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{"bugzilla": {"description": "kernel: fuse: re-lock request before returning from fuse_ref_folio()", "id": "2507098", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507098"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The `fuse_ref_folio()` function does not properly re-lock a request after unlocking it, which can lead to a use-after-free vulnerability. A local attacker could exploit this flaw to potentially execute arbitrary code or cause a denial of service."], "name": "CVE-2026-64266", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64266\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64266\nhttps://lore.kernel.org/linux-cve-announce/2026072558-CVE-2026-64266-67e6@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,1f9156714592356b4fda57beac7eab9c2a462dd3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,5630da218a45ba80f0aba0846cbe8aa655da122b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,1ca605cfa59377f0143fb35b5b01360f37d1b7c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,0e4a5a000123d81234e27a2f8187688cf608f755)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,e6aa539720c3d8def69683ed0c07cf9faea4e8be)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,be353caffa8640f5e25fb3714ce8b0cef5e410e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,65a1c2551f7e16085acbb54aedde1feaa559ba7a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c3021629a0d820247ee12b6c5192a1d5380e21c6,b5befa80fdbe287a98480effed9564712924add5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.35"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.35)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-25T11:15:04.067744+00:00", "updated": "2026-08-03T19:45:07.055635+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}