CVE-2026-43500: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present
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.
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Status incidents that name it
- · Minor · names this CVE
“…Linux Privilege Escalation Vulnerability We have completed our investigation and response to the "DirtyFrag" (CVE-2026-43500, CVE-2026-43284) and "Fragnesia" (CVE-2026-46300) vulnerabilities. We have published documentation articles with…”
- · Minor · names this CVE
“…Linux Privilege Escalation Vulnerability We have completed our investigation and response to the "DirtyFrag" (CVE-2026-43500, CVE-2026-43284) and "Fragnesia" (CVE-2026-46300) vulnerabilities. We have published documentation articles with…”
Affected vendors and products
Linux: LinuxRed Hat: Red Hat Enterprise Linux 10Red Hat: Red Hat Enterprise Linux 6Red Hat: Red Hat Enterprise Linux 7Red Hat: Red Hat Enterprise Linux 8Red Hat: Red Hat Enterprise Linux 9Red Hat: Red Hat OpenShift Container Platform 4
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568 (opens in new tab)
- git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c (opens in new tab)
- git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b (opens in new tab)
- git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 (opens in new tab)
- git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)