---
cve: "CVE-2026-53174"
severity: "HIGH"
cvss: 7.8
epss: "12%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-06-25 09:16:34"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T09:14:13+02:00"
---

# CVE-2026-53174

> 7.8 HIGH

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

ovl: keep err zero after successful ovl_cache_get()

ovl_iterate_merged() stores PTR_ERR(cache) in err before checking
IS_ERR(cache). On success err holds the truncated cache pointer and
can be returned as a bogus non-zero error.

The syzbot reproducer reaches this through overlay-on-overlay readdir:

  getdents64
    iterate_dir(outer overlay file)
      ovl_iterate_merged()
        ovl_cache_get()
          ovl_dir_read_merged()
            ovl_dir_read()
              iterate_dir(inner overlay file)
                ovl_iterate_merged()

Only compute PTR_ERR(cache) on the error path.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 7.0.13

## Referenzen

- <https://git.kernel.org/stable/c/e7051909a01bfb883bfa78b27514854068ac4b85>
- <https://git.kernel.org/stable/c/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-53174) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_