{"id":"CVE-2026-43465","revision":null,"records":[{"revision":"6dac2bdf77b34536a7dde134925349f7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43465","aliases":[],"title":"net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ\n\nXDP multi-buf programs can modify the layout of the XDP buffer when the\nprogram calls bpf_xdp_pull_data() or bpf_xdp_adjust_tail(). The\nreferenced commit in the fixes tag corrected the assumption in the mlx5\ndriver that the XDP buffer layout doesn't change during a program\nexecution. However, this fix introduced another issue: the dropped\nfragments still need to be counted on the driver side to avoid page\nfragment reference counting issues.\n\nThe issue was discovered by the drivers/net/xdp.py selftest,\nmore specifically the test_xdp_native_tx_mb:\n- The mlx5 driver allocates a page_pool page and initializes it with\n  a frag counter of 64 (pp_ref_count=64) and the internal frag counter\n  to 0.\n- The test sends one packet with no payload.\n- On RX (mlx5e_skb_from_cqe_mpwrq_nonlinear()), mlx5 configures the XDP\n  buffer with the packet data starting in the first fragment which is the\n  page mentioned above.\n- The XDP program runs and calls bpf_xdp_pull_data() which moves the\n  header into the linear part of the XDP buffer. As the packet doesn't\n  contain more data, the program drops the tail fragment since it no\n  longer contains any payload (pp_ref_count=63).\n- mlx5 device skips counting this fragment. Internal frag counter\n  remains 0.\n- mlx5 releases all 64 fragments of the page but page pp_ref_count is\n  63 => negative reference counting error.\n\nResulting splat during the test:\n\n  WARNING: CPU: 0 PID: 188225 at ./include/net/page_pool/helpers.h:297 mlx5e_page_release_fragmented.isra.0+0xbd/0xe0 [mlx5_core]\n  Modules linked in: [...]\n  CPU: 0 UID: 0 PID: 188225 Comm: ip Not tainted 6.18.0-rc7_for_upstream_min_debug_2025_12_08_11_44 #1 NONE\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n  RIP: 0010:mlx5e_page_release_fragmented.isra.0+0xbd/0xe0 [mlx5_core]\n  [...]\n  Call Trace:\n   <TASK>\n   mlx5e_free_rx_mpwqe+0x20a/0x250 [mlx5_core]\n   mlx5e_dealloc_rx_mpwqe+0x37/0xb0 [mlx5_core]\n   mlx5e_free_rx_descs+0x11a/0x170 [mlx5_core]\n   mlx5e_close_rq+0x78/0xa0 [mlx5_core]\n   mlx5e_close_queues+0x46/0x2a0 [mlx5_core]\n   mlx5e_close_channel+0x24/0x90 [mlx5_core]\n   mlx5e_close_channels+0x5d/0xf0 [mlx5_core]\n   mlx5e_safe_switch_params+0x2ec/0x380 [mlx5_core]\n   mlx5e_change_mtu+0x11d/0x490 [mlx5_core]\n   mlx5e_change_nic_mtu+0x19/0x30 [mlx5_core]\n   netif_set_mtu_ext+0xfc/0x240\n   do_setlink.isra.0+0x226/0x1100\n   rtnl_newlink+0x7a9/0xba0\n   rtnetlink_rcv_msg+0x220/0x3c0\n   netlink_rcv_skb+0x4b/0xf0\n   netlink_unicast+0x255/0x380\n   netlink_sendmsg+0x1f3/0x420\n   __sock_sendmsg+0x38/0x60\n   ____sys_sendmsg+0x1e8/0x240\n   ___sys_sendmsg+0x7c/0xb0\n   [...]\n   __sys_sendmsg+0x5f/0xb0\n   do_syscall_64+0x55/0xc70\n\nThe problem applies for XDP_PASS as well which is handled in a different\ncode path in the driver.\n\nThis patch fixes the issue by doing page frag counting on all the\noriginal XDP buffer fragments for all relevant XDP actions (XDP_TX ,\nXDP_REDIRECT and XDP_PASS). This is basically reverting to the original\ncounting before the commit in the fixes tag.\n\nAs frag_page is still pointing to the original tail, the nr_frags\nparameter to xdp_update_skb_frags_info() needs to be calculated\nin a different way to reflect the new nr_frags.","state":0,"publishedAt":"2026-05-08T14:22:26.822+00:00","modifiedAt":"2026-10-21T12:40:50.278+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/mellanox/mlx5/core/en_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8b051d7f530e8a5237da242fbeafef02fec6b813\",\n                            \"lessThan\": \"6451ea47d60a8ca3524dfe370c013cd01063c7d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cb9edd583e23979ee546981be963ad5f217e8b18\",\n                            \"lessThan\": \"f0a850677a7b7589208ce11480e6958f516c8386\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"87bcef158ac1faca1bd7e0104588e8e2956d10be\",\n                            \"lessThan\": \"7d7342a18fadcdb70a63b3c930dc63528ce51832\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"87bcef158ac1faca1bd7e0104588e8e2956d10be\",\n                            \"lessThan\": \"043bd62f748bc9fd98154037aa598cffbd3c667c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"87bcef158ac1faca1bd7e0104588e8e2956d10be\",\n                            \"lessThan\": \"db25c42c2e1f9c0d136420fff5e5700f7e771a6f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f2557d7fa38e9475b38588f5c124476091480f53\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.6.115\",\n                            \"lessThan\": \"6.6.160\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.56\",\n                            \"lessThan\": \"6.12.114\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17.6\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/mellanox/mlx5/core/en_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.19\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.9\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/6451ea47d60a8ca3524dfe370c013cd01063c7d3","https://git.kernel.org/stable/c/f0a850677a7b7589208ce11480e6958f516c8386","https://git.kernel.org/stable/c/7d7342a18fadcdb70a63b3c930dc63528ce51832","https://git.kernel.org/stable/c/043bd62f748bc9fd98154037aa598cffbd3c667c","https://git.kernel.org/stable/c/db25c42c2e1f9c0d136420fff5e5700f7e771a6f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43465","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43465","identifiers":["CVE-2026-43465"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-ce0df89a405747cda5b7c61ae0b48fb2","complete":true,"records":13633,"lastAttemptAt":"2026-11-08T10:04:58.8018093+00:00","lastSuccessAt":"2026-11-08T05:08:40.263+00:00","error":null,"lastVerifiedAt":"2026-11-08T05:08:40.263+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-08T10:04:32.7352320+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T10:04:32.735232+00:00","lastSuccessAt":"2026-11-08T10:04:32.958305+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.9583056+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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