CVE-2026-64265

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64265", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.774Z", "datePublished": "2026-07-25T08:49:14.548Z", "dateUpdated": "2026-08-17T04:52:19.015Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:52:19.015Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq->processing back to\nfiq->pending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq->interrupts. If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq->interrupts. When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq->pending and frees it\nvia the refcount path, also without cleaning intr_entry. The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq->interrupts:\n - list_del_init(&req->intr_entry) -> UAF write on freed slab\n - req->in.h.unique -> UAF read, data leaked to userspace\n\nRemove intr_entry from fiq->interrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq->pending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."}], "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 through local filesystem, signal, and read/write syscalls involving an attached /dev/fuse descriptor. No network or physical input directly reaches the vulnerable functions.\nAC:L - A malicious FUSE daemon can deterministically withhold a request, signal its client, issue FUSE_NOTIFY_RESEND, deliver a fatal signal, and read the stale interrupt. Polling permits synchronization without depending on an uncontrollable race.\nPR:L - Normal FUSE supports user-namespace and non-privileged mounts, while opening the FUSE device has no kernel capability check. An ordinary user can control both the daemon and client processes in a reasonable deployment.\nUI:N - All triggering operations can be performed programmatically by attacker-controlled daemon and client processes. No separate victim must mount or access the filesystem.\nS:U - Exploitation compromises the same kernel security authority in which the vulnerable FUSE code executes. This is a standard local kernel privilege escalation rather than a guest-to-host boundary escape.\nC:H - fuse_read_interrupt() reads req->in.h.unique from freed slab memory and copies it to userspace. Slab reuse or cache merging can expose replacement-object contents through this UAF read.\nI:H - list_del_init() interprets freed or reused intr_entry pointers as live list links and writes through them as well as into the freed object. Heap grooming can leverage this memory corruption for arbitrary writes or control-flow compromise.\nA:H - The stale list pointers and UAF writes can corrupt kernel queues or slab objects and cause an oops or panic. The attacker can repeat the deterministic trigger sequence."}]}], "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": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "lessThan": "1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c", "status": "affected", "versionType": "git"}, {"version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "lessThan": "7366e6f4d2b4c7002b13fb01219e83679dad4127", "status": "affected", "versionType": "git"}, {"version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "lessThan": "893479015cb6442fd389d3b553ab3036c9541715", "status": "affected", "versionType": "git"}, {"version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "lessThan": "f8fce75fedf73ac72aa09163deb8f4291fdcaad2", "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": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "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": "6.9", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"}, {"url": "https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127"}, {"url": "https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715"}, {"url": "https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2"}], "title": "fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/fuse/dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c", "status": "affected", "version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "versionType": "git"}, {"lessThan": "7366e6f4d2b4c7002b13fb01219e83679dad4127", "status": "affected", "version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "versionType": "git"}, {"lessThan": "893479015cb6442fd389d3b553ab3036c9541715", "status": "affected", "version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "versionType": "git"}, {"lessThan": "f8fce75fedf73ac72aa09163deb8f4291fdcaad2", "status": "affected", "version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/fuse/dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "95CEF1E2-98DB-4D14-8BB5-1BF3FA9BF03C", "versionEndExcluding": "6.12.96", "versionStartIncluding": "6.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "914AE4BC-3D59-4C5A-9DB5-9CE327B429F7", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.13", "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: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq->processing back to\nfiq->pending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq->interrupts. If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq->interrupts. When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq->pending and frees it\nvia the refcount path, also without cleaning intr_entry. The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq->interrupts:\n - list_del_init(&req->intr_entry) -> UAF write on freed slab\n - req->in.h.unique -> UAF read, data leaked to userspace\n\nRemove intr_entry from fiq->interrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq->pending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."}], "id": "CVE-2026-64265", "lastModified": "2026-08-17T05:17:25.277", "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": "2026-07-25T10:17:06.667", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req", "id": "2507041", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507041"}, "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 component. When a fuse request is interrupted and then resent, a specific interrupt entry (`intr_entry`) is not properly cleared. If the requesting task subsequently receives a fatal signal, this uncleared entry can lead to a use-after-free condition. This vulnerability can result in memory corruption, potentially causing a system crash, and may also lead to the disclosure of sensitive data to userspace."], "name": "CVE-2026-64265", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not 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-2026-64265\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64265\nhttps://lore.kernel.org/linux-cve-announce/2026072558-CVE-2026-64265-5f6c@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[760eac73f9f69aa28fcb3050b4946c2dcc656d12,1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[760eac73f9f69aa28fcb3050b4946c2dcc656d12,7366e6f4d2b4c7002b13fb01219e83679dad4127)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[760eac73f9f69aa28fcb3050b4946c2dcc656d12,893479015cb6442fd389d3b553ab3036c9541715)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[760eac73f9f69aa28fcb3050b4946c2dcc656d12,f8fce75fedf73ac72aa09163deb8f4291fdcaad2)"}}], "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": "generic", "value": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"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": "2026-07-25T10:45:03.540412+00:00", "updated": "2026-08-02T13:45:06.962924+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}