Bug 2490544 (CVE-2026-55392) - CVE-2026-55392 nilfs-utils: NILFS utilities: Denial of Service via crafted NILFS2 images
Summary: CVE-2026-55392 nilfs-utils: NILFS utilities: Denial of Service via crafted NI...
Keywords:
Status: NEW
Alias: CVE-2026-55392
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On: 2491296 2491298
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-18 19:01 UTC by OSIDB Bzimport
Modified: 2026-06-22 09:47 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-06-18 19:01:19 UTC 
NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.
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