linux: In the Linux kernel, the following vulnerability has been resolved: ubi: Fix UAF wear-leveling entry in eraseblk_cou...
CVE-2023-53826 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53826, released December 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.
In the Linux kernel, the following vulnerability has been resolved: ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example: __erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF! Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show(). Fetch a reproducer in [Link].
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.20-1 | DEBIAN-CVE-2023-53826 | Dec 9, 2025 |
| linux · Debian 13.5 (trixie) | 6.1.20-1 | DEBIAN-CVE-2023-53826 | Dec 9, 2025 |
| linux · Debian 14 | 6.1.20-1 | DEBIAN-CVE-2023-53826 | Dec 9, 2025 |
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