CVE-2026-43500

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.

From the Tenable Blog

Dirty Frag (CVE-2026-43284,CVE-2026-43500): Linux Kernel Privilege Escalation FAQ | Tenable®

Published: 2026-05-08

Dirty Frag (CVE-2026-43284, CVE-2026-43500) is a Linux kernel local privilege escalation exploit chain with a public PoC affecting major Linux distributions.

References

• Exploits
• References
• Tenable Blogs
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Details

Source: Mitre, NVD

Named Vulnerability: DirtyFragNamed Vulnerability: Dirty FragNamed Vulnerability: Copy Fail 2

Risk Information

CVSS v2

CVSS v3

EPSS

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest