CVE-2026-64023

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Reverse the order of cleanup."}], "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 - Exploitation requires writing to the gpio-aggregator configfs interface at /sys/kernel/config/gpio-aggregator/ (live attribute) or equivalent sysfs driver attributes; there is no network, adjacent, or physical attack path.\nAC:L - The attacker can reliably win the race by concurrently triggering failed aggregator activation (live=1 with probe-forcing config) and GPIO lookup activity (gpiod_find via parallel activations or device probing); both race sides are attacker-controlled.\nPR:L - Default configfs/sysfs access is root-only, but industrial/embedded GPIO-aggregator deployments commonly delegate configfs management to local service accounts; any local user with write access to the gpio-aggregator configfs tree can exploit without full init-namespace root.\nUI:N - Exploitation is fully attacker-driven through configfs writes and concurrent threads; no victim interaction is required.\nS:U - Impact is confined to kernel memory via the GPIO lookup-table UAF; this is standard local kernel privilege escalation/memory corruption, not a cross-boundary escape (VM, IOMMU, or sandbox).\nC:H - The use-after-free dereferences freed dev_id memory in strcmp() during gpiod_match_lookup_table(), enabling arbitrary kernel heap reads and information disclosure.\nI:H - Use-after-free on a global lookup-table entry can be leveraged with heap grooming for memory corruption and potential arbitrary write or code execution, not merely a bounded modification.\nA:H - Dereferencing freed dev_id memory can cause kernel oops/panic from invalid memory access; UAF bugs inherently threaten system availability even when not fully exploited."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpio/gpio-aggregator.c"], "versions": [{"version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8", "lessThan": "ea28b286649b70618e9dd3e895812417a7712a11", "status": "affected", "versionType": "git"}, {"version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8", "lessThan": "7ac4183a41ba048af89eddd82fe8be64619d0871", "status": "affected", "versionType": "git"}, {"version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8", "lessThan": "30c073cab97afb31901f94de9605177b6b84367e", "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/gpio/gpio-aggregator.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "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": "6.16", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ea28b286649b70618e9dd3e895812417a7712a11"}, {"url": "https://git.kernel.org/stable/c/7ac4183a41ba048af89eddd82fe8be64619d0871"}, {"url": "https://git.kernel.org/stable/c/30c073cab97afb31901f94de9605177b6b84367e"}], "title": "gpio: aggregator: fix a potential use-after-free", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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{"bugzilla": {"description": "kernel: gpio: aggregator: fix a potential use-after-free", "id": "2502392", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502392"}, "csaw": false, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngpio: aggregator: fix a potential use-after-free\nOn error we free aggr->lookups->dev_id before removing the entry from\nthe lookup table. If a concurrent thread calls gpiod_find() before we\nremove the entry, it could iterate over the list and call\ngpiod_match_lookup_table() which unconditionally dereferences dev_id\nwhen calling strcmp(). Reverse the order of cleanup.", "A flaw was found in the Linux kernel's GPIO (General Purpose Input/Output) aggregator module. This vulnerability occurs when an error condition causes memory to be prematurely freed while still being referenced in a lookup table. A local attacker could potentially exploit this timing issue, leading to a use-after-free condition. This could result in a system crash or other unpredictable behavior, impacting system stability."], "name": "CVE-2026-64023", "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-2026-64023\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64023\nhttps://lore.kernel.org/linux-cve-announce/2026071902-CVE-2026-64023-8096@gregkh/T"]}

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