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vuln-cve/data/2024/41xxx/CVE-2024-41012.json
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"cveId": "CVE-2024-41012",
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"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-07-12T12:17:45.611Z",
"datePublished": "2024-07-23T08:06:02.579Z",
"dateUpdated": "2026-08-05T11:34:38.897Z"
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"value": "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()."
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"value": "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 — creating the lock, racing the close, and reading `/proc/locks` — 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 — 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 — 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."
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