CVE-2026-74605

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74605", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.919Z", "datePublished": "2026-08-22T15:31:53.063Z", "dateUpdated": "2026-10-21T12:46:03.903Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:46:03.903Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Use children field for rcu head and add memory barriers\n\nWhen an eventfs inode is freed, it sets ei->is_freed and then uses its\nei->list to add it to the srcu link list as the list field is a union with\nthe rcu list head. As the ei->list is used to iterate over an SRCU\nprotected list without taking the eventfs_mutex, there's nothing stopping\nthe iteration over that list to see the ei->rcu instead of the ei->list\nand it will read a corrupt target.\n\nTo fix this, change the union of the rcu list head with the children list.\nOn freeing the eventfs inode, set the is_free and execute a smp_wmb()\nbefore adding the eventfs inode to the SRCU list.\n\nOn iteration of the ei->children list, at the start, execute a smp_rmb()\nand then read the is_freed of the ei to see if the children list is still\nvalid. If is_freed is set, then the ei_child read is not valid and the\nloop should exit immediately."}], "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 bug is reached only via local syscalls (getdents64/readdir on tracefs eventfs directories through eventfs_iterate); tracefs is a kernel pseudo-filesystem under /sys/kernel/tracing with no network, adjacent-wireless, or physical-device entry path.\nAC:L - A single multithreaded attacker can loop getdents on events/ or events/kprobes/ while concurrently adding/removing kprobes via kprobe_events writes that call eventfs_remove_dir; the attacker controls both the SRCU list walk and the free path, making the race reliably triggerable.\nPR:L - Exploitation needs only local tracefs read/write access (getdents plus kprobe_events to create/remove eventfs children); kprobe_events checks only LOCKDOWN_TRACEFS and DAC with no capable(), and tracing-group gid mounts, Android/ChromeOS, and developer systems commonly grant this to unprivileged users.\nUI:N - The attacker performs all concurrent directory reads and dynamic event removals in their own process; no separate victim mount, click, or configuration action is required beyond tracefs already being accessible on the system.\nS:U - The union misuse causes kernel heap/list corruption and use-after-free within the tracing filesystem subsystem on the same host; it does not cross VM, container, IOMMU, or other security boundaries to affect a different authority.\nC:H - During list_for_each_entry_srcu over ei->children, a concurrently freed child repurposes ei->list (union with rcu_head) for SRCU teardown, so the iterator follows corrupt list pointers and dereferences freed or attacker-influenced kernel memory typical of UAF read primitives.\nI:H - Corrupt SRCU list traversal over freed eventfs_inode objects is classic kernel UAF memory corruption that can be combined with heap grooming from repeated kprobe create/delete to obtain arbitrary kernel writes and local privilege escalation, not merely a bounded crash.\nA:H - Following a child's list.next after the list/rcu union is switched during free_ei() readily causes invalid pointer dereferences, kernel oops, or panic; the race can be retriggered at will by alternating getdents with dynamic event teardown."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/tracefs/event_inode.c", "fs/tracefs/internal.h"], "versions": [{"version": "f3f41f444b321ec393edbc251e024fd62658ce55", "lessThan": "25d27d5fa8645ab61018c3efec5c69f49280ca7d", "status": "affected", "versionType": "git"}, {"version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "lessThan": "1b95382da85cff3bf0f922ff0275f186abdadfce", "status": "affected", "versionType": "git"}, {"version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "lessThan": "2b80707b9e27671e10840d17c6f8f774c4ad9847", "status": "affected", "versionType": "git"}, {"version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "lessThan": "004f7232e49730448f91665e76bdd7dff8e0c638", "status": "affected", "versionType": "git"}, {"version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "lessThan": "f0ece16ffca7384787b692431961ce202907acf5", "status": "affected", "versionType": "git"}, {"version": "305c4e4d80aca2c2d9cf2ebdea56e2eca6d3a6aa", "status": "affected", "versionType": "git"}, {"version": "6.6.18", "lessThan": "6.6.160", "status": "affected", "versionType": "semver"}, {"version": "6.7.6", "lessThan": "6.8", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/tracefs/event_inode.c", "fs/tracefs/internal.h"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "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": "6.6.18", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/25d27d5fa8645ab61018c3efec5c69f49280ca7d"}, {"url": "https://git.kernel.org/stable/c/1b95382da85cff3bf0f922ff0275f186abdadfce"}, {"url": "https://git.kernel.org/stable/c/2b80707b9e27671e10840d17c6f8f774c4ad9847"}, {"url": "https://git.kernel.org/stable/c/004f7232e49730448f91665e76bdd7dff8e0c638"}, {"url": "https://git.kernel.org/stable/c/f0ece16ffca7384787b692431961ce202907acf5"}], "title": "eventfs: Use children field for rcu head and add memory barriers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/tracefs/event_inode.c", "fs/tracefs/internal.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "25d27d5fa8645ab61018c3efec5c69f49280ca7d", "status": "affected", "version": "f3f41f444b321ec393edbc251e024fd62658ce55", "versionType": "git"}, {"lessThan": "1b95382da85cff3bf0f922ff0275f186abdadfce", "status": "affected", "version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "versionType": "git"}, {"lessThan": "2b80707b9e27671e10840d17c6f8f774c4ad9847", "status": "affected", "version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "versionType": "git"}, {"lessThan": "004f7232e49730448f91665e76bdd7dff8e0c638", "status": "affected", "version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "versionType": "git"}, {"lessThan": "f0ece16ffca7384787b692431961ce202907acf5", "status": "affected", "version": "704f960dbee2f1634f4b4e16f208cb16eaf41c1e", "versionType": "git"}, {"status": "affected", "version": "305c4e4d80aca2c2d9cf2ebdea56e2eca6d3a6aa", "versionType": "git"}, {"lessThan": "6.6.160", "status": "affected", "version": "6.6.18", "versionType": "semver"}, {"lessThan": "6.8", "status": "affected", "version": "6.7.6", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/tracefs/event_inode.c", "fs/tracefs/internal.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Use children field for rcu head and add memory barriers\n\nWhen an eventfs inode is freed, it sets ei->is_freed and then uses its\nei->list to add it to the srcu link list as the list field is a union with\nthe rcu list head. As the ei->list is used to iterate over an SRCU\nprotected list without taking the eventfs_mutex, there's nothing stopping\nthe iteration over that list to see the ei->rcu instead of the ei->list\nand it will read a corrupt target.\n\nTo fix this, change the union of the rcu list head with the children list.\nOn freeing the eventfs inode, set the is_free and execute a smp_wmb()\nbefore adding the eventfs inode to the SRCU list.\n\nOn iteration of the ei->children list, at the start, execute a smp_rmb()\nand then read the is_freed of the ei to see if the children list is still\nvalid. If is_freed is set, then the ei_child read is not valid and the\nloop should exit immediately."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\neventfs: Usar el campo children para la cabecera rcu y a\u00f1adir barreras de memoria\n\nCuando un inodo eventfs es liberado, establece ei -> is_freed y luego usa su ei -> list para a\u00f1adirlo a la lista de enlaces srcu ya que el campo list es una uni\u00f3n con la cabecera de la lista rcu. Como el ei -> list se usa para iterar sobre una lista protegida por SRCU sin tomar el eventfs_mutex, no hay nada que impida que la iteraci\u00f3n sobre esa lista vea el ei -> rcu en lugar del ei -> list y leer\u00e1 un objetivo corrupto.\n\nPara solucionar esto, cambiar la uni\u00f3n de la cabecera de la lista rcu con la lista children. Al liberar el inodo eventfs, establecer el is_free y ejecutar un smp_wmb() antes de a\u00f1adir el inodo eventfs a la lista SRCU.\n\nEn la iteraci\u00f3n de la lista ei -> children, al inicio, ejecutar un smp_rmb() y luego leer el is_freed del ei para ver si la lista children sigue siendo v\u00e1lida. Si is_freed est\u00e1 establecido, entonces la lectura de ei_child no es v\u00e1lida y el bucle deber\u00eda salir inmediatamente."}], "id": "CVE-2026-74605", "lastModified": "2026-10-21T13:19:47.930", "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": "2026-08-22T16:16:32.977", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/004f7232e49730448f91665e76bdd7dff8e0c638"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b95382da85cff3bf0f922ff0275f186abdadfce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/25d27d5fa8645ab61018c3efec5c69f49280ca7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b80707b9e27671e10840d17c6f8f774c4ad9847"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0ece16ffca7384787b692431961ce202907acf5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: eventfs: Use children field for rcu head and add memory barriers", "id": "2521489", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521489"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\neventfs: Use children field for rcu head and add memory barriers\nWhen an eventfs inode is freed, it sets ei->is_freed and then uses its\nei->list to add it to the srcu link list as the list field is a union with\nthe rcu list head. As the ei->list is used to iterate over an SRCU\nprotected list without taking the eventfs_mutex, there's nothing stopping\nthe iteration over that list to see the ei->rcu instead of the ei->list\nand it will read a corrupt target.\nTo fix this, change the union of the rcu list head with the children list.\nOn freeing the eventfs inode, set the is_free and execute a smp_wmb()\nbefore adding the eventfs inode to the SRCU list.\nOn iteration of the ei->children list, at the start, execute a smp_rmb()\nand then read the is_freed of the ei to see if the children list is still\nvalid. If is_freed is set, then the ei_child read is not valid and the\nloop should exit immediately.", "A flaw was found in the Linux kernel's `eventfs` component. This vulnerability allows a local attacker to cause a system crash or other unpredictable behavior due to a race condition during the freeing of an `eventfs` inode. The issue stems from improper synchronization when iterating over a specific internal list, which can lead to reading corrupted memory."], "name": "CVE-2026-74605", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74605\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74605\nhttps://lore.kernel.org/linux-cve-announce/2026082216-CVE-2026-74605-94d2@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[704f960dbee2f1634f4b4e16f208cb16eaf41c1e,004f7232e49730448f91665e76bdd7dff8e0c638)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[704f960dbee2f1634f4b4e16f208cb16eaf41c1e,f0ece16ffca7384787b692431961ce202907acf5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f3f41f444b321ec393edbc251e024fd62658ce55,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[305c4e4d80aca2c2d9cf2ebdea56e2eca6d3a6aa,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.18,6.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.7.6,6.8)"}}], "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": "[6.8,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.9,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2,*]"}}], "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": "2026-08-22T17:30:02.703011+00:00", "updated": "2026-08-25T18:30:04.997499+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}