CVE-2026-43500

Advisory lineage Upstream: 0 Downstream: 13
Modified
Published: 11 May 2026, 06:26
Last modified:14 Jun 2026, 17:45

Vulnerability Summary

Overall Risk (default)
high
60/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
93.99% CRITICAL
94% probability +60.34%
KEV
Not listed
Ransomware
No reports
Public exploits
4 found
Dark Web
Not detected

Timeline

11 May 2026, 06:26
Published
Vulnerability first disclosed
14 Jun 2026, 17:45
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 93.99%• Percentile: 100%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ d0d5c0cd1e711c98703f3544c1e6fc1372898de5, < 7c504ffab3efce8f7e4f463b314ae31030bdf18b | ≥ d0d5c0cd1e711c98703f3544c1e6fc1372898de5, < 3711382a77342a9a1c3d2e7330dcfc7ea927f568 | ≥ d0d5c0cd1e711c98703f3544c1e6fc1372898de5, < 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c | ≥ d0d5c0cd1e711c98703f3544c1e6fc1372898de5, < d45179f8795222ce858770dc619abe51f9d24411 | ≥ d0d5c0cd1e711c98703f3544c1e6fc1372898de5, < aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 | 5.3

  • linux•linux_kernel

    > 5.3, < 6.18.29 | ≥ 6.19, < 7.0.6 | 5.3 | 5.3:rc7 | 5.3:rc8 | 7.1:rc1 | 7.1:rc2

References (6)