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Vulnerability record · CVE-2026-53272 · published 25 June 2026

CVE-2026-53272: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: erofs: fix use-after-free on sbi->sync_decompress z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress. When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress. Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!

7.8 CVSS 3.1 High EPSS 0.12% · top 98.5% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
8 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix use-after-free on sbi->sync_decompress z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress. When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress. Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/00bf6868df65fa95b3854996246d15759fdc7070 Patch
https://git.kernel.org/stable/c/1aee05e814d292064bf5fa15733741040cdc48ba Patch
https://git.kernel.org/stable/c/86ab00cf81d44b675bb23db62b88fd76c8ac8cea Patch
https://git.kernel.org/stable/c/95caf60da33d87ed26c28993620f0d92487b0296 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53272), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.