{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27389", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:47:42.676Z", "datePublished": "2024-05-01T13:05:09.224Z", "dateUpdated": "2026-08-05T11:29:24.931Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:24.931Z" }, "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---" } ], "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 — 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 — 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 — 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 — 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", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/pstore/inode.c" ], "versions": [ { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "d0ee2a8adb6673382cce8a4280e1ca0849b3b783", "status": "affected", "versionType": "git" }, { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e", "status": "affected", "versionType": "git" }, { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "4cdf9006fc095af71da80e9b5f48a32e991b9ed3", "status": "affected", "versionType": "git" }, { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "cb9e802e49c24eeb3af35e9e8c04d526f35f112a", "status": "affected", "versionType": "git" }, { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6", "status": "affected", "versionType": "git" }, { "version": "609e28bb139e53621521130f0d4aea27a725d465", "lessThan": "a43e0fc5e9134a46515de2f2f8d4100b74e50de3", "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/pstore/inode.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.8", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": 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