297 lines
15 KiB
JSON
297 lines
15 KiB
JSON
{
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"cveId": "CVE-2025-21830",
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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": "2024-12-29T08:45:45.776Z",
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"datePublished": "2025-03-06T16:08:09.894Z",
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"dateUpdated": "2026-10-15T21:51:53.705Z"
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},
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"dateUpdated": "2026-08-05T11:54:47.539Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Handle weird files\n\nA corrupted filesystem (e.g. bcachefs) might return weird files.\nInstead of throwing a warning and allowing access to such file, treat\nthem as regular files."
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}
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H",
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"baseScore": 7.3,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached only via local `renameat2(2)`/`linkat(2)` on an inode backed by a mounted crafted filesystem image, plus local Landlock syscalls to establish the domain. No network-facing consumer exists — NFS, SMB and FUSE clients all normalize or reject the invalid `S_IFMT` values before they reach an inode.\nAC:L - The attacker crafts the bcachefs/JFS/HFS+ image containing the weird-mode inode and drives the rename himself from a self-created Landlock domain, so the trigger is deterministic with no race, timing, or memory-layout dependency.\nPR:L - `landlock_create_ruleset()`/`landlock_restrict_self()` require no capability at all, and an ordinary desktop/kiosk console user can get an attacker-supplied image mounted through udisks2 removable-media automount without root; only a local unprivileged account is needed.\nUI:N - The attacker performs the entire sequence — supply the image, self-sandbox with Landlock, issue the rename or link — with no action required from another user.\nS:C - The fail-open `return 0` bypasses the Landlock sandbox boundary, letting a confined process act on filesystem resources that the sandbox policy placed under a separate security authority, consistent with the `S:C` treatment of the analogous Landlock refer-path bypass in CVE-2025-68736.\nC:N - No memory is read out of bounds and no kernel data is exposed; the anti-right-widening logic in `collect_domain_accesses()` uses the full `LANDLOCK_MASK_ACCESS_FS` and is unaffected, so no read rights are gained.\nI:L - Dropping the `LANDLOCK_ACCESS_FS_MAKE_*` requirement lets a sandboxed process create, link, or relocate weird-typed files into directories the policy protects, but the bypass is confined to same-mount operations on corrupt inodes and DAC still applies, so the unauthorized modification is limited.\nA:H - The path hits `WARN_ON_ONCE(1)`, which panics the kernel outright when `panic_on_warn` is set — the configuration under which syzbot reported this — giving a full denial of service."
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}
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