{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-58089", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-58089" ], "published": "2025-03-12T09:43:14Z", "summary": "btrfs: fix double accounting race when btrfs_run_delalloc_range() failed", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double accounting race when btrfs_run_delalloc_range() failed\n\n[BUG]\nWhen running btrfs with block size (4K) smaller than page size (64K,\naarch64), there is a very high chance to crash the kernel at\ngeneric/750, with the following messages:\n(before the call traces, there are 3 extra debug messages added)\n\n BTRFS warning (device dm-3): read-write for sector size 4096 with page size 65536 is experimental\n BTRFS info (device dm-3): checking UUID tree\n hrtimer: interrupt took 5451385 ns\n BTRFS error (device dm-3): cow_file_range failed, root=4957 inode=257 start=1605632 len=69632: -28\n BTRFS error (device dm-3): run_delalloc_nocow failed, root=4957 inode=257 start=1605632 len=69632: -28\n BTRFS error (device dm-3): failed to run delalloc range, root=4957 ino=257 folio=1572864 submit_bitmap=8-15 start=1605632 len=69632: -28\n ------------[ cut here ]------------\n WARNING: CPU: 2 PID: 3020984 at ordered-data.c:360 can_finish_ordered_extent+0x370/0x3b8 [btrfs]\n CPU: 2 UID: 0 PID: 3020984 Comm: kworker/u24:1 Tainted: G OE 6.13.0-rc1-custom+ #89\n Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022\n Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs]\n pc : can_finish_ordered_extent+0x370/0x3b8 [btrfs]\n lr : can_finish_ordered_extent+0x1ec/0x3b8 [btrfs]\n Call trace:\n can_finish_ordered_extent+0x370/0x3b8 [btrfs] (P)\n can_finish_ordered_extent+0x1ec/0x3b8 [btrfs] (L)\n btrfs_mark_ordered_io_finished+0x130/0x2b8 [btrfs]\n extent_writepage+0x10c/0x3b8 [btrfs]\n extent_write_cache_pages+0x21c/0x4e8 [btrfs]\n btrfs_writepages+0x94/0x160 [btrfs]\n do_writepages+0x74/0x190\n filemap_fdatawrite_wbc+0x74/0xa0\n start_delalloc_inodes+0x17c/0x3b0 [btrfs]\n btrfs_start_delalloc_roots+0x17c/0x288 [btrfs]\n shrink_delalloc+0x11c/0x280 [btrfs]\n flush_space+0x288/0x328 [btrfs]\n btrfs_async_reclaim_data_space+0x180/0x228 [btrfs]\n process_one_work+0x228/0x680\n worker_thread+0x1bc/0x360\n kthread+0x100/0x118\n ret_from_fork+0x10/0x20\n ---[ end trace 0000000000000000 ]---\n BTRFS critical (device dm-3): bad ordered extent accounting, root=4957 ino=257 OE offset=1605632 OE len=16384 to_dec=16384 left=0\n BTRFS critical (device dm-3): bad ordered extent accounting, root=4957 ino=257 OE offset=1622016 OE len=12288 to_dec=12288 left=0\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008\n BTRFS critical (device dm-3): bad ordered extent accounting, root=4957 ino=257 OE offset=1634304 OE len=8192 to_dec=4096 left=0\n CPU: 1 UID: 0 PID: 3286940 Comm: kworker/u24:3 Tainted: G W OE 6.13.0-rc1-custom+ #89\n Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022\n Workqueue: btrfs_work_helper [btrfs] (btrfs-endio-write)\n pstate: 404000c5 (nZcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : process_one_work+0x110/0x680\n lr : worker_thread+0x1bc/0x360\n Call trace:\n process_one_work+0x110/0x680 (P)\n worker_thread+0x1bc/0x360 (L)\n worker_thread+0x1bc/0x360\n kthread+0x100/0x118\n ret_from_fork+0x10/0x20\n Code: f84086a1 f9000fe1 53041c21 b9003361 (f9400661)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Oops: Fatal exception\n SMP: stopping secondary CPUs\n SMP: failed to stop secondary CPUs 2-3\n Dumping ftrace buffer:\n (ftrace buffer empty)\n Kernel Offset: 0x275bb9540000 from 0xffff800080000000\n PHYS_OFFSET: 0xffff8fbba0000000\n CPU features: 0x100,00000070,00801250,8201720b\n\n[CAUSE]\nThe above warning is triggered immediately after the delalloc range\nfailure, this happens in the following sequence:\n\n- Range [1568K, 1636K) is dirty\n\n 1536K 1568K 1600K 1636K 1664K\n | |/////////|////////| |\n\n Where 1536K, 1600K and 1664K are page boundaries (64K page size)\n\n- Enter extent_writepage() for page 1536K\n\n- Enter run_delalloc_nocow() with locke\n---truncated---", "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", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1", "1:6.6.74-1+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", 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"https://git.kernel.org/stable/c/21333148b5c9e52f41fafcedec3810b56a5e0e40" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0283ee1912c8e243c931f4ee5b3672e954fe0384" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/72dad8e377afa50435940adfb697e070d3556670" } ], "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 vulnerable path is reached through ordinary filesystem syscalls (buffered write/fallocate on a mounted btrfs) with writeback executed by a kernel worker; no network or remote peer data is involved.\nAC:L - The attacker controls both sides of the race \u2014 they fill the filesystem to force the `btrfs_reserve_extent()` ENOSPC failure and issue the concurrent dirtying/writeback that leaves the ordered extent still in the io tree \u2014 and the upstream reproducer (generic/750) crashes with \"very high chance\"; subpage btrfs needs no kernel CONFIG, only a 4K-sector filesystem on a 64K/16K-page kernel, and the compressed-writeback variant exists on all page sizes.\nPR:L - Any unprivileged local user with write access to a btrfs filesystem (e.g. /home, /var/tmp) can create prealloc extents, drive the filesystem to ENOSPC, and dirty pages; no capabilities and no mount privileges are required.\nUI:N - Exploitation needs only the attacker's own writes on an already-mounted filesystem; writeback is initiated by the kernel (shrink_delalloc/reclaim worker) with no victim action.\nS:U - The corruption is confined to kernel memory and the btrfs filesystem within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The double `btrfs_remove_ordered_extent()`/`btrfs_put_ordered_extent()` frees the ordered-extent slab object while its embedded `btrfs_work` remains linked, giving a use-after-free on a sprayable kmem_cache object, and the duplicated extent/metadata accounting can hand the same on-disk extent to two files, exposing other users' data.\nI:H - The bug yields workqueue and rb-tree list corruption (re-INIT of a linked node plus double `list_add_tail`, `rb_erase` on a cleared node) and a UAF write primitive, plus doubled delalloc metadata release and `nr_ordered_extents` underflow that corrupt on-disk space accounting.\nA:H - The upstream report shows a WARNING followed by a NULL pointer dereference in `process_one_work` and \"Kernel panic - not syncing: Oops: Fatal exception\"; the reachable `BUG_ON(list_empty(&root->ordered_root))` gives a second guaranteed-crash path." } } }