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High severity7.8NVD Advisory· Published May 11, 2026· Updated May 14, 2026

CVE-2026-43500

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.

Affected products

7
  • Torvalds/Linuxinferred
  • Linux/Kernel6 versions
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 5 more
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >5.3,<6.18.29
    • cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

News mentions

50