CVE-2025-38709None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: loop: Avoid updating block size under exclusive owner Syzbot came up with a reproducer where a loop device block size is changed underneath a mounted filesystem. This …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
0.1% → 0.2%
In the Linux kernel, the following vulnerability has been resolved:
loop: Avoid updating block size under exclusive owner
Syzbot came up with a reproducer where a loop device block size is changed underneath a mounted filesystem. This causes a mismatch between the block device block size and the block size stored in the superblock causing confusion in various places such as fs/buffer.c. The particular issue triggered by syzbot was a warning in __getblk_slow() due to requested buffer size not matching block device block size.
Fix the problem by getting exclusive hold of the loop device to change its block size. This fails if somebody (such as filesystem) has already an exclusive ownership of the block device and thus prevents modifying the loop device under some exclusive owner which doesn't expect it.
Linux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < 46034518cae95db4abfde990c9ca1a0751855072Linux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < 457d2c5e112fd08dc1039b1ae39a83ec1782360dLinux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < 139a000d20f2f38ce34296feddd641d730fe1c08Linux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < b928438cc87c0bf7ae078e4b7b6e14261e84c5c5Linux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < 5d67b30aefeb7a949040bbb1b4e3b84c5d29a624Linux >= 89e4fdecb51cf5535867026274bc97de9480ade5 < 7e49538288e523427beedd26993d446afef1a6fbLinux 4.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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