---
cve: "CVE-2022-48819"
severity: "LOW"
cvss: 3.1
epss: "23%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-07-16 12:15:05"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T05:26:48+02:00"
---

# CVE-2022-48819

> 3.1 LOW

## Beschreibung

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

tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case

syzbot found that mixing sendpage() and sendmsg(MSG_ZEROCOPY)
calls over the same TCP socket would again trigger the
infamous warning in inet_sock_destruct()

	WARN_ON(sk_forward_alloc_get(sk));

While Talal took into account a mix of regular copied data
and MSG_ZEROCOPY one in the same skb, the sendpage() path
has been forgotten.

We want the charging to happen for sendpage(), because
pages could be coming from a pipe. What is missing is the
downgrading of pure zerocopy status to make sure
sk_forward_alloc will stay synced.

Add tcp_downgrade_zcopy_pure() helper so that we can
use it from the two callers.

## Patch verfügbar (OSV)

- Kernel ≥ 5.16.10

## Referenzen

- <https://git.kernel.org/stable/c/47f3860c4931175f112f28dcac66eacca9b1040f>
- <https://git.kernel.org/stable/c/f8d9d938514f46c4892aff6bfe32f425e84d81cc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2022-48819) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_