{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-41012", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-41012" ], "published": "2024-07-23T08:06:47Z", "summary": "filelock: Remove locks reliably when fcntl/close race is detected", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilelock: Remove locks reliably when fcntl/close race is detected\n\nWhen fcntl_setlk() races with close(), it removes the created lock with\ndo_lock_file_wait().\nHowever, LSMs can allow the first do_lock_file_wait() that created the lock\nwhile denying the second do_lock_file_wait() that tries to remove the lock.\nSeparately, posix_lock_file() could also fail to\nremove a lock due to GFP_KERNEL allocation failure (when splitting a range\nin the middle).\n\nAfter the bug has been triggered, use-after-free reads will occur in\nlock_get_status() when userspace reads /proc/locks. This can likely be used\nto read arbitrary kernel memory, but can't corrupt kernel memory.\n\nFix it by calling locks_remove_posix() instead, which is designed to\nreliably get rid of POSIX locks associated with the given file and\nfiles_struct and is also used by filp_flush().", "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", "1:6.6.28-1+rpt1", "1:6.6.31-1+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": 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"type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-41012" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9" } ], "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 is reached only through the local `fcntl(F_SETLK/F_SETLKW)` syscall path in `fcntl_setlk()`, with the resulting use-after-free read triggered by reading the local `/proc/locks` file. Network file-lock consumers (nfsd, lockd, ksmbd) call `vfs_lock_file()` directly and never traverse the buggy recovery branch.\nAC:L - The attacker controls both sides of the fcntl/close race and can make it fully deterministic by blocking a second thread in `F_SETLKW` behind a conflicting lock it owns, closing the fd, then releasing the blocker. The failure of the recovery unlock is likewise attacker-inducible, either via an LSM policy asymmetry or by forcing the `GFP_KERNEL` allocation failure in the mid-range split path under attacker-generated memory pressure.\nPR:L - Any unprivileged local user can call `fcntl()` on a file it can open and read the world-readable `/proc/locks` (confirmed mode `-r--r--r--`); no capability, user-namespace, or mount privilege is checked anywhere along the path.\nUI:N - The attacker performs every step itself \u2014 creating the lock, racing the close, and reading `/proc/locks` \u2014 with no action required from any other user or process.\nS:U - The dangling `file_lock` and the resulting reads stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `lock_get_status()` dereferences the freed `struct file` (`flc->flc_file->f_inode`) and prints `inode->i_sb->s_dev` and `inode->i_ino` to userspace, giving a chosen-address read primitive once the freed slot is groomed \u2014 the fix author states this \"can likely be used to read arbitrary kernel memory.\"\nI:H - The use-after-free leaves permanently corrupted kernel lock state \u2014 a `file_lock` with dangling `flc_file` and `flc_owner` that can never be released, so a recycled `files_struct` at the same address grants an unrelated (possibly higher-privileged) process spurious ownership of the stale lock. Combined with the arbitrary-read primitive that defeats KASLR and exposes credentials/keys, the condition is leverageable toward privilege escalation.\nA:H - Reading `/proc/locks` after the freed page is reclaimed oopses the kernel, and the pre-fix `WARN_ON_ONCE()` panics outright on the `panic_on_warn` configurations common in hardened and Android deployments. The permanently un-releasable stale lock also blocks any other process waiting via `F_SETLKW` on that inode indefinitely." } } }