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].

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00036.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 3f9b63dfce44a7c3c095dd93d910408e07ab1845
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 1cb14c06d6035539ef4215c4ba0871aea71d7c38
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 9d448dd6bcb61a508204b57ea1f454ba9bac2f24
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 79548ccdd992707879b4b683b7251c58ddf26f12
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < 84253f3c2dad6be10d30c92626c763d9a9f512ad
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < a100de2974d208cfca032179b02ed4d1a0a7f143
801c135ce73d5df1caf3eca35b66a10824ae0707 affected < a240bc5c43130c6aa50831d7caaa02a1d84e1bce
Linux Linux affected
Version Status Constraints
2.6.22 affected —
0 unaffected < 2.6.22
4.14.308 unaffected ≤ 4.14.*
4.19.276 unaffected ≤ 4.19.*
5.4.235 unaffected ≤ 5.4.*
5.10.173 unaffected ≤ 5.10.*
5.15.100 unaffected ≤ 5.15.*
6.1.18 unaffected ≤ 6.1.*
6.2.5 unaffected ≤ 6.2.*
6.3 unaffected ≤ *

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Linux Subscribe
Linux Kernel Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38 cve-icon cve-icon
https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845 cve-icon cve-icon
https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12 cve-icon cve-icon
https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1 cve-icon cve-icon
https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad cve-icon cve-icon
https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24 cve-icon cve-icon
https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143 cve-icon cve-icon
https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025120951-CVE-2023-53826-26a2@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-53826 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-53826 cve-icon
History

Wed, 10 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 09 Dec 2025 02:00:00 +0000

Type Values Removed Values Added
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].
Title ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-09T01:29:39.679Z

Reserved: 2025-12-09T01:27:17.824Z

Link: CVE-2023-53826

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-09T16:17:21.457

Modified: 2025-12-09T18:37:13.640

Link: CVE-2023-53826

cve-icon Redhat

Severity : Low

Publid Date: 2025-12-09T00:00:00Z

Links: CVE-2023-53826 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.