Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 before 59db5d8bcc65e04d8598afd81ec3a18edb407470; affected 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 before 86ab00cf81d44b675bb23db62b88fd76c8ac8cea; affected 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 before 00bf6868df65fa95b3854996246d15759fdc7070; affected 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 before 95caf60da33d87ed26c28993620f0d92487b0296; affected 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 before 1aee05e814d292064bf5fa15733741040cdc48ba |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 6.6.160 through 6.6.*; unaffected 6.12.94 through 6.12.*; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/59db5d8bcc65e04d8598afd81ec3a18edb407470
- 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