$ cve CVE-2026-43500 JSON

CVE-2026-43500 EXPLOIT

7.8

HIGH · CVSS 3.1 · EPSS 2.3% (pctl 82)

Patch early

A public exploit exists.

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

Scoring

CVSS	7.8 (HIGH, v3.1)
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS	2.26% — more likely to be exploited than 82% of all CVEs
Weakness	CWE-787
On CISA KEV	no
Public exploit	yes
Published	2026-05-11
Last modified	2026-08-24

Affected (1)

Vendor	Product
linux	linux kernel

Public exploits

Source	Title	Date
exploit-db	Linux Kernel - Local Privilege Escalation	2026-05-29
exploit-db	Linux Kernel - Local Privilege Escalation	2026-05-27

References

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