{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-27389", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-27389" ], "published": "2024-05-01T13:06:43Z", "summary": "pstore: inode: Only d_invalidate() is needed", "details": "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---", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7", 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"binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v8", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-2712", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v6", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v7", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v7l", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v8", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-2712", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v6", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v7", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v7l", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v8", 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"linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed", "upstream_version": "6.1.21", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.83" }, "1:6.1.47-1+rpt2": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.83" }, "1:6.1.47-1+rpt4": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.83", "compiled_filter": false }, "1:6.1.54-1+rpt2": { "linux_commit": "2906f7abdc03d4a92b6b0e2e0c87ea2a9dffe8f7", "upstream_version": "6.1.54", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.83" }, "1:6.1.58-1+rpt2": { "linux_commit": "ccf1586ad0663fa91238ac56abf6340d6d740d18", "upstream_version": "6.1.58", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.83" }, "1:6.1.63-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.63", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.83" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.83" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.23" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-27389" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d0ee2a8adb6673382cce8a4280e1ca0849b3b783" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4cdf9006fc095af71da80e9b5f48a32e991b9ed3" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/cb9e802e49c24eeb3af35e9e8c04d526f35f112a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a43e0fc5e9134a46515de2f2f8d4100b74e50de3" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "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." } } }