Medium 5.5Published May 27, 2026

CVE-2026-46061jbd2: fix deadlock in jbd2_journal_cancel_revoke()

Updated under an hour ago (Oct 27, 2026, 9:23 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: jbd2: fix deadlock in jbd2_journal_cancel_revoke() Commit f76d4c28a46a ("fs/jbd2: use sleeping version of __find_get_block()") changed jbd2_journal_cancel_revoke() to use __find_get_block_nonatomic() which holds the folio lock instead of i_private_lock. This breaks the lock ordering (folio -> buffer) and causes an ABBA deadlock when the filesystem blocksize < pagesize: T1 T2 ext4_mkdir() ext4_init_new_dir() ext4_append() ext4_getblk() lock_buffer() <- A sync_blockdev() blkdev_writepages() writeback_iter() writeback_get_folio() folio_lock() <- B ext4_journal_get_create_access() jbd2_journal_cancel_revoke() __find_get_block_nonatomic() folio_lock() <- B block_write_full_folio() lock_buffer() <- A This can occasionally cause generic/013 to hang. Fix by only calling __find_get_block_nonatomic() when the passed buffer_head doesn't belong to the bdev, which is the only case that we need to look up its bdev alias. Otherwise, the lookup is redundant since the found buffer_head is equal to the one we passed in.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f1c5aa614b5c251f93a6a4c8c26001d5e9e53fd6 before dff07cc98fdf6af57a7c054dc09b2050a9d5c287; from f76d4c28a46a9260d85e00dafc8f46d369365d33 before 2b2fee890250ab647a601124471a334bb01a0790; from f76d4c28a46a9260d85e00dafc8f46d369365d33 before bbd943d6a2d566428324b516a37f98328dfb802d; from f76d4c28a46a9260d85e00dafc8f46d369365d33 before 981fcc5674e67158d24d23e841523eccba19d0e7; 1bb7a4b6b3d7dd8da6f5a9d0529d42c22a359e71; from 6.12.31 before 6.12.86; from 6.14.9 before 6.15	CNA record
linux linux_kernel linux:linux_kernel	from 6.12.31 before 6.12.86; from 6.14.9 before 6.15; from 6.15.1 before 6.18.27; from 6.19 before 7.0.4; 6.15; 6.15; 6.15; 6.15; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/dff07cc98fdf6af57a7c054dc09b2050a9d5c287	patch
https://git.kernel.org/stable/c/2b2fee890250ab647a601124471a334bb01a0790	patch
https://git.kernel.org/stable/c/bbd943d6a2d566428324b516a37f98328dfb802d	patch
https://git.kernel.org/stable/c/981fcc5674e67158d24d23e841523eccba19d0e7	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.