Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 7c504ffab3efce8f7e4f463b314ae31030bdf18b; affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 3711382a77342a9a1c3d2e7330dcfc7ea927f568; affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c; affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before d45179f8795222ce858770dc619abe51f9d24411; affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 |
| Linux / Linux | affected 5.3; unaffected 0 before 5.3; unaffected 6.6.140 through 6.6.*; unaffected 6.12.88 through 6.12.*; unaffected 6.18.29 through 6.18.*; unaffected 7.0.6 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b
- https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568
- https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c
- https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411
- https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71
ADP enrichment
No English description supplied.
A flaw was found in the Linux kernel's RxRPC networking subsystem. When a socket buffer carrying a page-cache reference reaches the RxRPC authentication verification path, the kernel performs an in-place decryption directly on the referenced page without first isolating the buffer. A low-privileged local attacker can exploit this behavior to corrupt the page-cache contents of readable files, including sensitive system files such as /etc/passwd, and obtain root privileges. Exploitation does not require unprivileged user or network namespaces, but depends on the RxRPC protocol stack being available on the target system.