CVE-2023-53826

ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()

State: Published
Severity: Not scored
Published: Dec 9, 2025
Updated: May 11, 2026
Reserved: Dec 9, 2025

Description

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].

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	801c135ce73d5df1caf3eca35b66a10824ae0707 to before 3f9b63dfce44a7c3c095dd93d910408e07ab1845Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before 1cb14c06d6035539ef4215c4ba0871aea71d7c38Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before 9d448dd6bcb61a508204b57ea1f454ba9bac2f24Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before 79548ccdd992707879b4b683b7251c58ddf26f12Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before 84253f3c2dad6be10d30c92626c763d9a9f512adAffected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before a100de2974d208cfca032179b02ed4d1a0a7f143Affected 801c135ce73d5df1caf3eca35b66a10824ae0707 to before a240bc5c43130c6aa50831d7caaa02a1d84e1bceAffected
LinuxLinux	2.6.22Affected before 2.6.22Not affected 4.14.308 through 4.14.Not affected 4.19.276 through 4.19.Not affected 5.4.235 through 5.4.Not affected 5.10.173 through 5.10.Not affected 5.15.100 through 5.15.Not affected 6.1.18 through 6.1.Not affected 6.2.5 through 6.2.*Not affected 6.3 and laterNot affected

Product

Versions

LinuxLinux

801c135ce73d5df1caf3eca35b66a10824ae0707 to before 3f9b63dfce44a7c3c095dd93d910408e07ab1845Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before 1cb14c06d6035539ef4215c4ba0871aea71d7c38Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before 9d448dd6bcb61a508204b57ea1f454ba9bac2f24Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before 79548ccdd992707879b4b683b7251c58ddf26f12Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before 84253f3c2dad6be10d30c92626c763d9a9f512adAffected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before a100de2974d208cfca032179b02ed4d1a0a7f143Affected
801c135ce73d5df1caf3eca35b66a10824ae0707 to before a240bc5c43130c6aa50831d7caaa02a1d84e1bceAffected

LinuxLinux

2.6.22Affected
before 2.6.22Not affected
4.14.308 through 4.14.*Not affected
4.19.276 through 4.19.*Not affected
5.4.235 through 5.4.*Not affected
5.10.173 through 5.10.*Not affected
5.15.100 through 5.15.*Not affected
6.1.18 through 6.1.*Not affected
6.2.5 through 6.2.*Not affected
6.3 and laterNot affected

References

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