Not yet scoredPublished Dec 8, 2025

CVE-2023-53826ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()

Updated under an hour ago (Oct 27, 2026, 10:23 AM ET)

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Exploited in the last 30 days

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].

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	801c135ce73d5df1caf3eca35b66a10824ae0707 builds before 3f9b63dfce44a7c3c095dd93d910408e07ab1845; from 801c135ce73d5df1caf3eca35b66a10824ae0707 before 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1; 801c135ce73d5df1caf3eca35b66a10824ae0707 builds before 1cb14c06d6035539ef4215c4ba0871aea71d7c38; 801c135ce73d5df1caf3eca35b66a10824ae0707 builds before 9d448dd6bcb61a508204b57ea1f454ba9bac2f24; from 801c135ce73d5df1caf3eca35b66a10824ae0707 before 79548ccdd992707879b4b683b7251c58ddf26f12; from 801c135ce73d5df1caf3eca35b66a10824ae0707 before 84253f3c2dad6be10d30c92626c763d9a9f512ad; from 801c135ce73d5df1caf3eca35b66a10824ae0707 before a100de2974d208cfca032179b02ed4d1a0a7f143; from 801c135ce73d5df1caf3eca35b66a10824ae0707 before a240bc5c43130c6aa50831d7caaa02a1d84e1bce	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.