CVE-2026-64080

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A concurrent unregister can delete and free that\nentry in the gap, leaving the handler to dereference stale memory.\n\nCopy the callback pointer and callback data while notify_lock is\nstill held and invoke the callback only after the lock is dropped.\nThis keeps the existing callback execution model while removing the\nuse-after-free window in both the framework and non-framework\nnotification paths."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.3, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached through the Arm FF-A firmware notification IRQ/workqueue path (SMC/secure-partition notifications), not through any network protocol. Attackers reach it locally via secure-world FF-A traffic or TEE ioctl access on ARM64 TrustZone systems.\nAC:L - This is a race where the attacker can flood FF-A notifications from secure world (or via concurrent TEE sessions) while driver teardown unregisters the callback; both sides of the race are attacker-influenceable on systems with OP-TEE async notifications enabled.\nPR:N - A malicious secure-world partition can send FF-A notifications without any normal-world Linux credentials; the concurrent unregister side is reached automatically during kernel/driver teardown (reboot, shutdown, module unload) without requiring attacker privileges.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; a malicious secure-world component or automated teardown events (scheduled reboot, OTA, shutdown) can trigger the race without the user performing any action.\nS:C - On Arm TrustZone deployments, a malicious secure-world partition can corrupt normal-world kernel memory across the secure/normal-world security boundary, escalating impact beyond the FF-A driver's own authority into full kernel compromise.\nC:H - The UAF dereferences a freed kmalloc notifier entry containing callback metadata; stale heap contents can be read and leveraged for kernel memory disclosure consistent with UAF guidance.\nI:H - After the UAF, the handler invokes a function pointer read from freed memory (cb_info->cb/fwk_cb), enabling control-flow hijack and arbitrary kernel code execution via heap grooming.\nA:H - The UAF can cause immediate kernel oops/panic from dereferencing freed memory or invoking a corrupted function pointer, satisfying kernel crash guidance for UAF bugs."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/firmware/arm_ffa/driver.c"], "versions": [{"version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "lessThan": "d1e38551fadea230649bc428f0f35c9ee062a072", "status": "affected", "versionType": "git"}, {"version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "lessThan": "0e7be42ef2490f19d859a6146324d48cafdc9d5c", "status": "affected", "versionType": "git"}, {"version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "lessThan": "38290b180a4d5746baed796d49f88d56d2f336cd", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/firmware/arm_ffa/driver.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.15", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d1e38551fadea230649bc428f0f35c9ee062a072"}, {"url": "https://git.kernel.org/stable/c/0e7be42ef2490f19d859a6146324d48cafdc9d5c"}, {"url": "https://git.kernel.org/stable/c/38290b180a4d5746baed796d49f88d56d2f336cd"}], "title": "firmware: arm_ffa: Snapshot notifier callbacks under lock", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/firmware/arm_ffa/driver.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d1e38551fadea230649bc428f0f35c9ee062a072", "status": "affected", "version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "versionType": "git"}, {"lessThan": "0e7be42ef2490f19d859a6146324d48cafdc9d5c", "status": "affected", "version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "versionType": "git"}, {"lessThan": "38290b180a4d5746baed796d49f88d56d2f336cd", "status": "affected", "version": "285a5ea0f542db94c3ed11e01a71abb47d15cbf5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/firmware/arm_ffa/driver.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "89E9B97C-FD82-4D2E-8426-3A1A703B2ED7", "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_ffa: Snapshot notifier callbacks under lock\n\nBoth notification handlers currently look up a notifier callback under\nnotify_lock, drop the lock, and then dereference the returned\nnotifier entry. A concurrent unregister can delete and free that\nentry in the gap, leaving the handler to dereference stale memory.\n\nCopy the callback pointer and callback data while notify_lock is\nstill held and invoke the callback only after the lock is dropped.\nThis keeps the existing callback execution model while removing the\nuse-after-free window in both the framework and non-framework\nnotification paths."}], "id": "CVE-2026-64080", "lastModified": "2026-09-03T13:08:19.890", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:48.607", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e7be42ef2490f19d859a6146324d48cafdc9d5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38290b180a4d5746baed796d49f88d56d2f336cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1e38551fadea230649bc428f0f35c9ee062a072"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: firmware: arm_ffa: Snapshot notifier callbacks under lock", "id": "2502540", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502540"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nfirmware: arm_ffa: Snapshot notifier callbacks under lock\nBoth notification handlers currently look up a notifier callback under\nnotify_lock, drop the lock, and then dereference the returned\nnotifier entry. A concurrent unregister can delete and free that\nentry in the gap, leaving the handler to dereference stale memory.\nCopy the callback pointer and callback data while notify_lock is\nstill held and invoke the callback only after the lock is dropped.\nThis keeps the existing callback execution model while removing the\nuse-after-free window in both the framework and non-framework\nnotification paths.", "A flaw was found in the Linux kernel's ARM Firmware Framework for Arm (FFA) component. This vulnerability occurs because the system's notification handlers do not properly manage memory when processing callbacks. A timing issue can allow a callback to be unregistered and freed while it is still being accessed, leading to a use-after-free condition. This can result in system instability or unexpected behavior."], "name": "CVE-2026-64080", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64080\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64080\nhttps://lore.kernel.org/linux-cve-announce/2026071915-CVE-2026-64080-7f28@gregkh/T"], "threat_severity": "Moderate"}

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