{"id":"CVE-2026-43500","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-43500","summary":"rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Also unshare DATA/RESPONSE packets when paged frags are present\n\nThe DATA-packet handler in rxrpc_input_call_event() and the RESPONSE\nhandler in rxrpc_verify_response() copy the skb to a linear one before\ncalling into the security ops only when skb_cloned() is true.  An skb\nthat is not cloned but still carries externally-owned paged fragments\n(e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via\n__ip_append_data, or a chained skb_has_frag_list()) falls through to\nthe in-place decryption path, which binds the frag pages directly into\nthe AEAD/skcipher SGL via skb_to_sgvec().\n\nExtend the gate to also unshare when skb_has_frag_list() or\nskb_has_shared_frag() is true.  This catches the splice-loopback vector\nand other externally-shared frag sources while preserving the\nzero-copy fast path for skbs whose frags are kernel-private (e.g. NIC\npage_pool RX, GRO).  The OOM/trace handling already in place is reused.","published":"2026-05-11T06:26:45.838Z","modified":"2026-09-02T03:30:54.440554127Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.92855,"percentile":0.99824,"asOf":"2026-09-13"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.140"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43500.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-43500"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43500.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43500"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2468273"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"EVIDENCE","url":"https://github.com/V4bel/dirtyfrag"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-02T03:30:54.440554127Z"}}