Description (CNA)
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].
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 3f9b63dfce44a7c3c095dd93d910408e07ab1845; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 1cb14c06d6035539ef4215c4ba0871aea71d7c38; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 9d448dd6bcb61a508204b57ea1f454ba9bac2f24; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 79548ccdd992707879b4b683b7251c58ddf26f12; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before 84253f3c2dad6be10d30c92626c763d9a9f512ad; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before a100de2974d208cfca032179b02ed4d1a0a7f143; affected 801c135ce73d5df1caf3eca35b66a10824ae0707 before a240bc5c43130c6aa50831d7caaa02a1d84e1bce |
| Linux / Linux | affected 2.6.22; unaffected 0 before 2.6.22; unaffected 4.14.308 through 4.14.*; unaffected 4.19.276 through 4.19.*; unaffected 5.4.235 through 5.4.*; unaffected 5.10.173 through 5.10.*; unaffected 5.15.100 through 5.15.*; unaffected 6.1.18 through 6.1.*; unaffected 6.2.5 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845
- https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1
- https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38
- https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24
- https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12
- https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad
- https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143
- https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce