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        "cveId": "CVE-2024-35798",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-17T12:19:12.341Z",
        "datePublished": "2024-05-17T13:23:08.868Z",
        "dateUpdated": "2026-08-05T11:30:01.532Z"
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                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix race in read_extent_buffer_pages()\n\nThere are reports from tree-checker that detects corrupted nodes,\nwithout any obvious pattern so possibly an overwrite in memory.\nAfter some debugging it turns out there's a race when reading an extent\nbuffer the uptodate status can be missed.\n\nTo prevent concurrent reads for the same extent buffer,\nread_extent_buffer_pages() performs these checks:\n\n    /* (1) */\n    if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))\n        return 0;\n\n    /* (2) */\n    if (test_and_set_bit(EXTENT_BUFFER_READING, &eb->bflags))\n        goto done;\n\nAt this point, it seems safe to start the actual read operation. Once\nthat completes, end_bbio_meta_read() does\n\n    /* (3) */\n    set_extent_buffer_uptodate(eb);\n\n    /* (4) */\n    clear_bit(EXTENT_BUFFER_READING, &eb->bflags);\n\nNormally, this is enough to ensure only one read happens, and all other\ncallers wait for it to finish before returning.  Unfortunately, there is\na racey interleaving:\n\n    Thread A | Thread B | Thread C\n    ---------+----------+---------\n       (1)   |          |\n             |    (1)   |\n       (2)   |          |\n       (3)   |          |\n       (4)   |          |\n             |    (2)   |\n             |          |    (1)\n\nWhen this happens, thread B kicks of an unnecessary read. Worse, thread\nC will see UPTODATE set and return immediately, while the read from\nthread B is still in progress.  This race could result in tree-checker\nerrors like this as the extent buffer is concurrently modified:\n\n    BTRFS critical (device dm-0): corrupted node, root=256\n    block=8550954455682405139 owner mismatch, have 11858205567642294356\n    expect [256, 18446744073709551360]\n\nFix it by testing UPTODATE again after setting the READING bit, and if\nit's been set, skip the unnecessary read.\n\n[ minor update of changelog ]"
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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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                            "value": "AV:L - The vulnerable code is reached through ordinary filesystem syscalls (open/stat/read/readdir/write) against a locally mounted btrfs filesystem. No network protocol handler is involved, so this requires local system access.\nAC:L - The attacker controls every side of the race — multiple threads performing concurrent lookups of the same cold metadata block, with readahead supplying the WAIT_NONE submitter — and can retry indefinitely while adding memory and CPU pressure to widen the window. The race is known to trigger spontaneously in production without any attacker.\nPR:L - Any unprivileged local user with read access to a mounted btrfs filesystem can drive concurrent metadata reads of the same extent buffer; btrfs is the default root filesystem on several major distributions. No capability, ioctl, mount privilege, or namespace trick is needed.\nUI:N - The attacker triggers the race entirely with its own file I/O against an already-mounted filesystem. No victim action or cooperation is required.\nS:U - The corruption occurs within kernel memory and on-disk metadata managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Threads consume extent-buffer contents while DMA concurrently overwrites them, yielding torn header/item fields; garbage node blockptrs and nritems drive reads of arbitrary logical addresses, and the resulting heap out-of-bounds access on struct btrfs_path is leverageable for kernel memory disclosure.\nI:H - btrfs_search_slot() writes p->nodes[level] and p->slots[level] with an unvalidated 8-bit level taken from the racing memory, giving an out-of-bounds write of a kernel pointer past a kmalloc'd btrfs_path; separately, a leaf modified under an in-flight overwrite is checksummed and written back, causing persistent on-disk metadata corruption.\nA:H - The documented outcome is tree-checker \"corrupted node\" reports leading to -EUCLEAN and transaction abort with the filesystem forced read-only, and the out-of-bounds writes and garbage tree traversal readily produce ASSERT/BUG_ON hits and kernel oopses."
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