ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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].
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.22 and later | 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.22 and later Fixed in 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2023-53826
- 2026-10-03 Alias added: GHSA-39w7-pr2v-3x67
References
Other 8
- 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
More Linux vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
Sources
- CVE-2023-53826 · CVE Program
- CVE-2023-53826 · NVD
- FIRST EPSS
- GHSA-39w7-pr2v-3x67 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-53826 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences