CVE-2026-53272
N/A
Summary
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!!
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 < 86ab00cf81d44b675bb23db62b88fd76c8ac8cea | affected |
| Linux | Linux | 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 < 00bf6868df65fa95b3854996246d15759fdc7070 | affected |
| Linux | Linux | 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 < 95caf60da33d87ed26c28993620f0d92487b0296 | affected |
| Linux | Linux | 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 < 1aee05e814d292064bf5fa15733741040cdc48ba | affected |
| Linux | Linux | 5.17 | affected |
| Linux | Linux | 0 < 5.17 | unaffected |
| Linux | Linux | 6.12.94 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.36 <= 6.18.* | unaffected |
| Linux | Linux | 7.0.13 <= 7.0.* | unaffected |
| Linux | Linux | 7.1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/86ab00cf81d44b675bb23db62b88fd76c8ac8cea
- https://git.kernel.org/stable/c/00bf6868df65fa95b3854996246d15759fdc7070
- https://git.kernel.org/stable/c/95caf60da33d87ed26c28993620f0d92487b0296
- https://git.kernel.org/stable/c/1aee05e814d292064bf5fa15733741040cdc48ba
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