{"id":"CVE-2026-43464","summary":"net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: RX, Fix XDP multi-buf frag counting for legacy 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\nSuch issue can be observed with the\ntest_xdp_native_adjst_tail_shrnk_data selftest when using a payload of\n3600 and shrinking by 256 bytes (an upcoming selftest patch): the last\nfragment gets released by the XDP code but doesn't get tracked by the\ndriver. This results in a negative pp_ref_count during page release and\nthe following splat:\n\n  WARNING: include/net/page_pool/helpers.h:297 at mlx5e_page_release_fragmented.isra.0+0x4a/0x50 [mlx5_core], CPU#12: ip/3137\n  Modules linked in: [...]\n  CPU: 12 UID: 0 PID: 3137 Comm: ip Not tainted 6.19.0-rc3+ #12 NONE\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n  RIP: 0010:mlx5e_page_release_fragmented.isra.0+0x4a/0x50 [mlx5_core]\n  [...]\n  Call Trace:\n   \u003cTASK\u003e\n   mlx5e_dealloc_rx_wqe+0xcb/0x1a0 [mlx5_core]\n   mlx5e_free_rx_descs+0x7f/0x110 [mlx5_core]\n   mlx5e_close_rq+0x50/0x60 [mlx5_core]\n   mlx5e_close_queues+0x36/0x2c0 [mlx5_core]\n   mlx5e_close_channel+0x1c/0x50 [mlx5_core]\n   mlx5e_close_channels+0x45/0x80 [mlx5_core]\n   mlx5e_safe_switch_params+0x1a5/0x230 [mlx5_core]\n   mlx5e_change_mtu+0xf3/0x2f0 [mlx5_core]\n   netif_set_mtu_ext+0xf1/0x230\n   do_setlink.isra.0+0x219/0x1180\n   rtnl_newlink+0x79f/0xb60\n   rtnetlink_rcv_msg+0x213/0x3a0\n   netlink_rcv_skb+0x48/0xf0\n   netlink_unicast+0x24a/0x350\n   netlink_sendmsg+0x1ee/0x410\n   __sock_sendmsg+0x38/0x60\n   ____sys_sendmsg+0x232/0x280\n   ___sys_sendmsg+0x78/0xb0\n   __sys_sendmsg+0x5f/0xb0\n   [...]\n   do_syscall_64+0x57/0xc50\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.","modified":"2026-07-08T08:13:36.162012294Z","published":"2026-05-08T14:22:26.039Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43464.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03cb50e5b74fce8bf6d92b860371b66253cf0f8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c74557495efb4bd0adefdfc8678ecdbc82a06da3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43464.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43464"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"afd5ba577c10639f62e8120df67dc70ea4b61176"},{"fixed":"c74557495efb4bd0adefdfc8678ecdbc82a06da3"},{"fixed":"03cb50e5b74fce8bf6d92b860371b66253cf0f8d"},{"fixed":"a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"72328f25755ee966724f46e3a0e8e59bef2091ba"},{"last_affected":"0049fd63881505566824e88cfa624638f921c808"},{"last_affected":"d969645b9b7810289bf3c353ea06957373756b8e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.115"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.56"},{"fixed":"6.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.17.6"},{"fixed":"6.18"}]}],"versions":["v6.17.5","v6.12.55","v6.6.114","v6.17.4","v6.12.54","v6.6.113","v6.17.3","v6.12.53","v6.6.112","v6.17.2","v6.12.52","v6.6.111","v6.17.1","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.12.47","v6.6.106","v6.12.46","v6.6.105","v6.12.45","v6.6.104","v6.12.44","v6.6.103","v6.12.43","v6.6.102","v6.12.42","v6.12.41","v6.6.101","v6.16-rc6","v6.12.40","v6.6.100","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.6.99","v6.14-rc3","v6.12.38","v6.6.98","v6.12.37","v6.6.97","v6.12.36","v6.6.96","v6.12.35","v6.6.95","v6.12.34","v6.6.94","v6.12.33","v6.6.93","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.6.92","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.6.91","v6.12.28","v6.6.90","v6.15-rc5","v6.12.27","v6.6.89","v6.12.26","v6.14","v6.12.25","v6.6.88","v6.12.24","v6.6.87","v6.12.23","v6.12.22","v6.6.86","v6.12.21","v6.6.85","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.6.84","v6.14-rc4","v6.14-rc5","v6.12.19","v6.6.83","v6.14-rc2","v6.12.18","v6.6.82","v6.6.81","v6.12.17","v6.6.80","v6.12.16","v6.6.79","v6.12.15","v6.6.78","v6.13","v6.12.14","v6.13-rc1","v6.12.13","v6.6.77","v6.6.76","v6.12.12","v6.6.75","v6.12.11","v6.6.74","v6.13-rc6","v6.12.10","v6.6.73","v6.6.72","v6.13-rc7","v6.13-rc2","v6.12.9","v6.6.71","v6.13-rc5","v6.13-rc3","v6.6.70","v6.12.8","v6.6.69","v6.12-rc1","v6.13-rc4","v6.12.7","v6.6.68","v6.12.6","v6.6.67","v6.12.5","v6.6.66","v6.12.4","v6.6.65","v6.6.64","v6.12","v6.12.3","v6.6.63","v6.12.2","v6.12.1","v6.12-rc7","v6.6.62","v6.6.61","v6.12-rc3","v6.6.60","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.6.59","v6.12-rc2","v6.6.58","v6.6.57","v6.11-rc1","v6.6.56","v6.11-rc5","v6.6.55","v6.6.54","v6.11","v6.6.53","v6.6.52","v6.11-rc7","v6.6.51","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.6.50","v6.11-rc4","v6.6.49","v6.11-rc2","v6.6.48","v6.6.47","v6.10","v6.6.46","v6.6.45","v6.6.44","v6.6.43","v6.6.42","v6.6.41","v6.10-rc6","v6.6.40","v6.10-rc7","v6.6.39","v6.10-rc3","v6.9-rc1","v6.6.38","v6.10-rc5","v6.10-rc2","v6.6.37","v6.6.36","v6.10-rc4","v6.6.35","v6.9","v6.6.34","v6.6.33","v6.6.32","v6.6.31","v6.6.30","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.6.29","v6.6.28","v6.8-rc1","v6.6.27","v6.6.26","v6.6.25","v6.6.24","v6.6.23","v6.6.22","v6.7-rc1","v6.8-rc7","v6.6.21","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.6.20","v6.6.19","v6.6.18","v6.6.17","v6.6.16","v6.6.15","v6.6.14","v6.6.13","v6.7","v6.6.12","v6.7-rc3","v6.7-rc8","v6.6.11","v6.7-rc7","v6.6.10","v6.6.9","v6.7-rc6","v6.6.8","v6.7-rc2","v6.6.7","v6.7-rc4","v6.7-rc5","v6.6.6","v6.6.5","v6.6.4","v6.6","v6.6.3","v6.6.2","v6.6.1","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3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