---
cve: "CVE-2026-46300"
severity: "HIGH"
cvss: 7.8
epss: "7%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-23 12:17:02"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T23:06:03+02:00"
---

# CVE-2026-46300

> 7.8 HIGH

## Beschreibung

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

net: skbuff: preserve shared-frag marker during coalescing

skb_try_coalesce() can attach paged frags from @from to @to.  If @from
has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same
externally-owned or page-cache-backed frags, but the shared-frag marker
is currently lost.

That breaks the invariant relied on by later in-place writers.  In
particular, ESP input checks skb_has_shared_frag() before deciding
whether an uncloned nonlinear skb can skip skb_cow_data().  If TCP
receive coalescing has moved shared frags into an unmarked skb, ESP can
see skb_has_shared_frag() as false and decrypt in place over page-cache
backed frags.

Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged
frags.  The tailroom copy path does not need the marker because it copies
bytes into @to's linear data rather than transferring frag descriptors.

## 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 |

## Exploit-Evidenz

- [EDB-52591 — Linux Kernel -  Local Privilege Escalation](https://www.exploit-db.com/exploits/52591)

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.257
- Kernel ≥ 5.15.208
- Kernel ≥ 6.1.174
- Kernel ≥ 6.6.141
- Kernel ≥ 6.12.91
- Kernel ≥ 6.18.33
- Kernel ≥ 7.0.10

## Referenzen

- <https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987>
- <https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c>
- <https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5>
- <https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0>
- <https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e>
- <https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a>
- <https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111>
- <https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3>
- <http://www.openwall.com/lists/oss-security/2026/05/13/5>
- <http://www.openwall.com/lists/oss-security/2026/05/21/11>
- <http://www.openwall.com/lists/oss-security/2026/05/21/12>
- <http://www.openwall.com/lists/oss-security/2026/05/21/13>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-46300) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_