{"id":"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.","modified":"2026-07-09T18:31:32.703557193Z","published":"2026-05-11T06:26:45.838Z","related":["CGA-5hw3-vrqw-q7j4","SUSE-SU-2026:1778-1","SUSE-SU-2026:1840-1","SUSE-SU-2026:1840-2","SUSE-SU-2026:1899-1","SUSE-SU-2026:1900-1","SUSE-SU-2026:1907-1","SUSE-SU-2026:1959-1","SUSE-SU-2026:2111-1","SUSE-SU-2026:21590-1","SUSE-SU-2026:21594-1","SUSE-SU-2026:21610-1","SUSE-SU-2026:21616-1","SUSE-SU-2026:21622-1","SUSE-SU-2026:21625-1","SUSE-SU-2026:21632-1","SUSE-SU-2026:21636-1","SUSE-SU-2026:21684-1","SUSE-SU-2026:21690-1","SUSE-SU-2026:2202-1","SUSE-SU-2026:2215-1","SUSE-SU-2026:2216-1","openSUSE-SU-2026:10793-1","openSUSE-SU-2026:20743-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43500.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d0d5c0cd1e711c98703f3544c1e6fc1372898de5"},{"fixed":"7c504ffab3efce8f7e4f463b314ae31030bdf18b"},{"fixed":"3711382a77342a9a1c3d2e7330dcfc7ea927f568"},{"fixed":"3eae0f4f9f7206a4801efa5e0235c25bbd5a412c"},{"fixed":"d45179f8795222ce858770dc619abe51f9d24411"},{"fixed":"aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43500.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.88"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.29"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43500.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}