{"id":"DEBIAN-CVE-2022-49068","details":"In the Linux kernel, the following vulnerability has been resolved:  btrfs: release correct delalloc amount in direct IO write path  Running generic/406 causes the following WARNING in btrfs_destroy_inode() which tells there are outstanding extents left.  In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding extents with btrfs_delalloc_reserve_metadata() (or indirectly from btrfs_delalloc_reserve_space(()). We then release the outstanding extents with btrfs_delalloc_release_extents(). However, the \"len\" can be modified in the COW case, which releases fewer outstanding extents than expected.  Fix it by calling btrfs_delalloc_release_extents() for the original length.  To reproduce the warning, the filesystem should be 1 GiB.  It's triggering a short-write, due to not being able to allocate a large extent and instead allocating a smaller one.    WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs]   Modules linked in: btrfs blake2b_generic xor lzo_compress   lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram   zsmalloc   CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014   RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs]   RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206   RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000   RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78   RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8   R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800   R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68   FS:  00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400   Call Trace:    \u003cTASK\u003e    destroy_inode+0x33/0x70    dispose_list+0x43/0x60    evict_inodes+0x161/0x1b0    generic_shutdown_super+0x2d/0x110    kill_anon_super+0xf/0x20    btrfs_kill_super+0xd/0x20 [btrfs]    deactivate_locked_super+0x27/0x90    cleanup_mnt+0x12c/0x180    task_work_run+0x54/0x80    exit_to_user_mode_prepare+0x152/0x160    syscall_exit_to_user_mode+0x12/0x30    do_syscall_64+0x42/0x80    entry_SYSCALL_64_after_hwframe+0x44/0xae    RIP: 0033:0x7f854a000fb7","modified":"2026-09-01T20:04:51.986189961Z","published":"2025-02-26T07:00:44.027Z","upstream":["CVE-2022-49068"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49068"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49068.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49068.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49068.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}