CVE-2024-27389

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Use d_invalidate()\nand update the code to not bother checking for error codes that can\nnever happen.\n\n---"}], "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 lives in the pstorefs VFS layer (fs/pstore/inode.c) and is reached only through local interfaces \u2014 an open file descriptor on a pstorefs record plus pstore backend teardown (module removal, driver unbind, or MTD device-removal notifier). No network or adjacent-network path exists.\nAC:L - The double-drop is deterministic, not a race: every record belonging to the unregistering backend takes the buggy path unconditionally, and keeping a record file open across teardown is fully under the attacker's control. No unpredictable memory layout or victim state is required to reach the underflow.\nPR:L - Consistent with this repo's scoring of driver-removal/rmmod-triggered UAFs, a local unprivileged process supplies the decisive half of the exploit \u2014 holding the fd, then driving slab reclaim of the freed pstore_private/dentry and consuming the primitives via read()/close(); backend unregistration also occurs on non-rmmod paths such as mtdpstore_notify_remove() and platform-driver removal during normal system operation.\nUI:N - No victim action is needed \u2014 the attacker performs the file open, the backend teardown, and the subsequent read()/close() that dereference the freed objects. Nothing requires a second user to interact with the system.\nS:U - The corruption is confined to kernel dcache and slab objects within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is standard in-kernel memory corruption.\nC:H - The premature dentry kill evicts the inode and frees pstore_private/pstore_record/record->buf while an open file still points at them via seq_file->private, so pstore_file_read() calls simple_read_from_buffer() with a freed, reclaimable source pointer and length \u2014 a controllable arbitrary kernel-memory read into userspace.\nI:H - The dentry refcount underflow frees the dentry while a file descriptor still holds it, so the later fput()/path_put()/dput() performs lockref decrements and d_child/d_subdirs list manipulation on reclaimed slab memory, yielding a write primitive suitable for heap-spray exploitation.\nA:H - At minimum the bug triggers WARNING at fs/dcache.c:762, which is fatal on the panic_on_warn configurations common in Android, hardened, and cloud kernels; with an open record file it produces a genuine dcache/slab use-after-free that reliably oopses or panics the kernel."}]}], "affected": [{"product": "Linux", 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/pstore/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d0ee2a8adb6673382cce8a4280e1ca0849b3b783", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}, {"lessThan": "db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}, {"lessThan": "4cdf9006fc095af71da80e9b5f48a32e991b9ed3", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}, {"lessThan": "cb9e802e49c24eeb3af35e9e8c04d526f35f112a", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}, {"lessThan": "340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}, {"lessThan": "a43e0fc5e9134a46515de2f2f8d4100b74e50de3", "status": "affected", "version": "609e28bb139e53621521130f0d4aea27a725d465", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/pstore/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.83", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.23", "versionType": "semver"}, {"lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.11", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E8D30B4C-D66E-4ECB-8103-8CD9DFE724AA", "versionEndExcluding": "6.1.83", "versionStartIncluding": "5.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E00814DC-0BA7-431A-9926-80FEB4A96C68", "versionEndExcluding": "6.6.23", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9B95D3A6-E162-47D5-ABFC-F3FA74FA7CFD", "versionEndExcluding": "6.7.11", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "543A75FF-25B8-4046-A514-1EA8EDD87AB1", "versionEndExcluding": "6.8.2", "versionStartIncluding": "6.8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npstore: inode: Only d_invalidate() is needed\n\nUnloading a modular pstore backend with records in pstorefs would\ntrigger the dput() double-drop warning:\n\n WARNING: CPU: 0 PID: 2569 at fs/dcache.c:762 dput.part.0+0x3f3/0x410\n\nUsing the combo of d_drop()/dput() (as mentioned in\nDocumentation/filesystems/vfs.rst) isn't the right approach here, and\nleads to the reference counting problem seen above. Use d_invalidate()\nand update the code to not bother checking for error codes that can\nnever happen.\n\n---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pstore: inode: solo se necesita d_invalidate(). La descarga de un backend modular de pstore con registros en pstorefs activar\u00eda la advertencia de doble ca\u00edda de dput(): ADVERTENCIA: CPU: 0 PID: 2569 en fs/dcache.c:762 dput.part.0+0x3f3/0x410 Usar la combinaci\u00f3n de d_drop()/dput() (como se menciona en Documentation/filesystems/vfs.rst) no es el enfoque correcto aqu\u00ed, y conduce al problema de recuento de referencias visto anteriormente. Utilice d_invalidate() y actualice el c\u00f3digo para no molestarse en buscar c\u00f3digos de error que nunca suceder\u00e1n. ---"}], "id": "CVE-2024-27389", "lastModified": "2026-08-04T11:17:41.550", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-27389", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-09T18:38:29.598548Z", "version": "2.0.3"}}]}, "published": "2024-05-01T13:15:51.653", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cdf9006fc095af71da80e9b5f48a32e991b9ed3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a43e0fc5e9134a46515de2f2f8d4100b74e50de3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cb9e802e49c24eeb3af35e9e8c04d526f35f112a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0ee2a8adb6673382cce8a4280e1ca0849b3b783"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cdf9006fc095af71da80e9b5f48a32e991b9ed3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a43e0fc5e9134a46515de2f2f8d4100b74e50de3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cb9e802e49c24eeb3af35e9e8c04d526f35f112a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: pstore: inode: Only d_invalidate() is needed", "id": "2278532", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2278532"}, "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": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\npstore: inode: Only d_invalidate() is needed\nUnloading a modular pstore backend with records in pstorefs would\ntrigger the dput() double-drop warning:\nWARNING: CPU: 0 PID: 2569 at fs/dcache.c:762 dput.part.0+0x3f3/0x410\nUsing the combo of d_drop()/dput() (as mentioned in\nDocumentation/filesystems/vfs.rst) isn't the right approach here, and\nleads to the reference counting problem seen above. Use d_invalidate()\nand update the code to not bother checking for error codes that can\nnever happen.\n---"], "name": "CVE-2024-27389", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-27389\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27389\nhttps://lore.kernel.org/linux-cve-announce/2024050135-CVE-2024-27389-fb3a@gregkh/T"], "threat_severity": "Low"}

{}