CVE-2022-49880
ext4: fix warning in 'ext4_da_release_space'
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix warning in 'ext4_da_release_space' Syzkaller report issue as follows: EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=0 EXT4-fs (loop0): dirty_blocks=0 EXT4-fs (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=0 EXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with only 0 reserved data blocks ------------[ cut here ]------------ WARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524 Modules linked in: CPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528 RSP: 0018:ffffc900015f6c90 EFLAGS: 00010296 RAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00 RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000 RBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5 R10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000 R13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461 mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589 ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852 do_writepages+0x3c3/0x680 mm/page-writeback.c:2469 __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587 writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870 wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044 wb_do_writeback fs/fs-writeback.c:2187 [inline] wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Above issue may happens as follows: ext4_da_write_begin ext4_create_inline_data ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); __ext4_ioctl ext4_ext_migrate -> will lead to eh->eh_entries not zero, and set extent flag ext4_da_write_begin ext4_da_convert_inline_data_to_extent ext4_da_write_inline_data_begin ext4_da_map_blocks ext4_insert_delayed_block if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk)) if (!ext4_es_scan_clu(inode, &ext4_es_is_mapped, lblk)) ext4_clu_mapped(inode, EXT4_B2C(sbi, lblk)); -> will return 1 allocated = true; ext4_es_insert_delayed_block(inode, lblk, allocated); ext4_writepages mpage_map_and_submit_extent(handle, &mpd, &give_up_on_write); -> return -ENOSPC mpage_release_unused_pages(&mpd, give_up_on_write); -> give_up_on_write == 1 ext4_es_remove_extent ext4_da_release_space(inode, reserved); if (unlikely(to_free > ei->i_reserved_data_blocks)) -> to_free == 1 but ei->i_reserved_data_blocks == 0 -> then trigger warning as above To solve above issue, forbid inode do migrate which has inline data.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
- CWE-noinfo Not enough information
Affected products
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 0de5ee103747fd3a24f1c010c79caabe35e8f0bb
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < c3bf1e95cfa7d950dc3c064d0c2e3d06b427bc63
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 890d738f569fa9412b70ba09f15407f17a52da20
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 72743d5598b9096950bbfd6a9b7f173d156eea97
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 5370b965b7a945bb8f48b9ee23d83a76a947902e
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 0a43c015e98121c91a76154edf42280ce1a8a883
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 89bee03d2fb8c54119b38ac6c24e7d60fae036b6
- affected 67cf5b09a46f72e048501b84996f2f77bc42e947 – < 1b8f787ef547230a3249bcf897221ef0cc78481b
- affected 3.8
- unaffected < 3.8
- unaffected 4.9.333 – ≤ 4.9.*
- unaffected 4.14.299 – ≤ 4.14.*
- unaffected 4.19.265 – ≤ 4.19.*
- unaffected 5.4.224 – ≤ 5.4.*
- unaffected 5.10.154 – ≤ 5.10.*
- unaffected 5.15.78 – ≤ 5.15.*
- unaffected 6.0.8 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (8)
- https://git.kernel.org/stable/c/0de5ee103747fd3a24f1c010c79caabe35e8f0bb (opens in a new tab)
- https://git.kernel.org/stable/c/c3bf1e95cfa7d950dc3c064d0c2e3d06b427bc63 (opens in a new tab)
- https://git.kernel.org/stable/c/890d738f569fa9412b70ba09f15407f17a52da20 (opens in a new tab)
- https://git.kernel.org/stable/c/72743d5598b9096950bbfd6a9b7f173d156eea97 (opens in a new tab)
- https://git.kernel.org/stable/c/5370b965b7a945bb8f48b9ee23d83a76a947902e (opens in a new tab)
- https://git.kernel.org/stable/c/0a43c015e98121c91a76154edf42280ce1a8a883 (opens in a new tab)
- https://git.kernel.org/stable/c/89bee03d2fb8c54119b38ac6c24e7d60fae036b6 (opens in a new tab)
- https://git.kernel.org/stable/c/1b8f787ef547230a3249bcf897221ef0cc78481b (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-49880)Record last updated .