386 lines
19 KiB
JSON
386 lines
19 KiB
JSON
{
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"cveId": "CVE-2024-41020",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.613Z",
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"datePublished": "2024-07-29T13:34:21.617Z",
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"dateUpdated": "2026-08-05T11:34:46.395Z"
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilelock: Fix fcntl/close race recovery compat path\n\nWhen I wrote commit 3cad1bc01041 (\"filelock: Remove locks reliably when\nfcntl/close race is detected\"), I missed that there are two copies of the\ncode I was patching: The normal version, and the version for 64-bit offsets\non 32-bit kernels.\nThanks to Greg KH for stumbling over this while doing the stable\nbackport...\n\nApply exactly the same fix to the compat path for 32-bit kernels."
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached only through the local `fcntl64(F_SETLK64/F_SETLKW64)` syscall racing a local `close()`; there is no remote or adjacent-network entry point into `fcntl_setlk64()`.\nAC:L - The attacker owns both sides of the race (one thread calling fcntl64, another calling close on the same fd) and can retry indefinitely, needing only one win to plant a permanent stale lock; the extra condition that makes the recovery unlock fail is also attacker-driven (concurrent relabel under SELinux/Smack enforcing, a killable signal during `nfs_iocounter_wait()` on an NFS mount, or a co-thread creating the merged range that forces an allocating split).\nPR:L - Any unprivileged local user can call fcntl64/close on a file it may open, and can read the world-readable `/proc/locks` to drive the use-after-free; no capability, LSM privilege, or namespace access is required.\nUI:N - The attacker performs every step itself — planting the stale lock and reading `/proc/locks` — with no victim action needed; unrelated tooling (`lslocks`, `lsof`, systemd, monitoring agents) reading `/proc/locks` merely widens the blast radius.\nS:U - The dangling `file_lock` and the resulting reads stay within the kernel's own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - After the leak, `lock_get_status()` dereferences the freed `struct file` and then the pointer it yields, printing `s_dev` and `i_ino` from attacker-groomed memory to userspace — a repeatable arbitrary kernel-memory read oracle, as the reporter states it \"can likely be used to read arbitrary kernel memory.\"\nI:H - This is a use-after-free on `flc_file`/`flc_owner`; the freed `files_struct` slot can be reoccupied by another (possibly privileged) process, which then owns and mutates the stale lock, and the attacker leaves a permanent, unremovable POSIX lock corrupting kernel-managed lock state relied on by other principals.\nA:H - Dereferencing the wild `flc_file`/`i_sb` pointers oopses inside `lock_get_status()` while `blocked_lock_lock` and `file_rwsem` are held for write, hanging or panicking the entire system, and the stale lock persists so the crash is triggerable by any `/proc/locks` reader."
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}
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