{"id":"CVE-2026-31419","summary":"net: bonding: fix use-after-free in bond_xmit_broadcast()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix use-after-free in bond_xmit_broadcast()\n\nbond_xmit_broadcast() reuses the original skb for the last slave\n(determined by bond_is_last_slave()) and clones it for others.\nConcurrent slave enslave/release can mutate the slave list during\nRCU-protected iteration, changing which slave is \"last\" mid-loop.\nThis causes the original skb to be double-consumed (double-freed).\n\nReplace the racy bond_is_last_slave() check with a simple index\ncomparison (i + 1 == slaves_count) against the pre-snapshot slave\ncount taken via READ_ONCE() before the loop.  This preserves the\nzero-copy optimization for the last slave while making the \"last\"\ndetermination stable against concurrent list mutations.\n\nThe UAF can trigger the following crash:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in skb_clone\nRead of size 8 at addr ffff888100ef8d40 by task exploit/147\n\nCPU: 1 UID: 0 PID: 147 Comm: exploit Not tainted 7.0.0-rc3+ #4 PREEMPTLAZY\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:123)\n print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)\n kasan_report (mm/kasan/report.c:597)\n skb_clone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108)\n bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5334)\n bond_start_xmit (drivers/net/bonding/bond_main.c:5567 drivers/net/bonding/bond_main.c:5593)\n dev_hard_start_xmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887)\n __dev_queue_xmit (include/linux/netdevice.h:3601 net/core/dev.c:4838)\n ip6_finish_output2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6_output.c:136)\n ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)\n ip6_output (net/ipv6/ip6_output.c:250)\n ip6_send_skb (net/ipv6/ip6_output.c:1985)\n udp_v6_send_skb (net/ipv6/udp.c:1442)\n udpv6_sendmsg (net/ipv6/udp.c:1733)\n __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206)\n __x64_sys_sendto (net/socket.c:2209)\n do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n \u003c/TASK\u003e\n\nAllocated by task 147:\n\nFreed by task 147:\n\nThe buggy address belongs to the object at ffff888100ef8c80\n which belongs to the cache skbuff_head_cache of size 224\nThe buggy address is located 192 bytes inside of\n freed 224-byte region [ffff888100ef8c80, ffff888100ef8d60)\n\nMemory state around the buggy address:\n ffff888100ef8c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc\n ffff888100ef8c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\u003effff888100ef8d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc\n                                                    ^\n ffff888100ef8d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb\n ffff888100ef8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================","modified":"2026-06-22T12:14:14.698089900Z","published":"2026-04-13T13:40:23.279Z","related":["ALSA-2026:13566","ALSA-2026:25191","ALSA-2026:25217","ALSA-2026:27353","ALSA-2026:27354"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31419.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3453882f36c40d2339267093676585a89808a73d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31419.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31419"},{"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":"4e5bd03ae34652cd932ab4c91c71c511793df75c"},{"fixed":"3453882f36c40d2339267093676585a89808a73d"},{"fixed":"d4cc7e4c80b1634c7b1497574a2fdb18df6c026c"},{"fixed":"f5b94654a4a19891a8108d66ef166de6c028c6cd"},{"fixed":"2884bf72fb8f03409e423397319205de48adca16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"20949c3816463e97c6f8fe84c0280c7e5ae83a8d"},{"last_affected":"f1d206181f19b00b275b258fea1418718a2f4173"},{"last_affected":"c1f1691ef84fa6d38fa5e5148eca073145e97ffa"}]}],"versions":["v5.16","v5.16.2","v5.15.16","v5.10.93","v5.10.92","v5.15.15","v5.16.1","v5.16-rc1","v5.10.91","v5.15.14","v5.16-rc8","v5.15.13","v5.10.90","v5.16-rc5","v5.16-rc6","v5.15.12","v5.10.89","v5.16-rc7","v5.15.11","v5.10.88","v5.16-rc3","v5.16-rc2","v5.15.10","v5.10.87","v5.15.9","v5.10.86","v5.16-rc4","v5.10.85","v5.15.8","v5.10.84","v5.15.7","v5.15","v5.15.6","v5.10.83","v5.10.82","v5.15.5","v5.10.81","v5.15.4","v5.10.80","v5.15.3","v5.15.2","v5.10.79","v5.15.1","v5.10.78","v5.10.77","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.10.76","v5.15-rc3","v5.15-rc5","v5.10.75","v5.15-rc6","v5.10.74","v5.14","v5.14-rc3","v5.10.73","v5.10.72","v5.10.71","v5.14-rc1","v5.10.70","v5.10.69","v5.10.68","v5.10.67","v5.10.66","v5.10.65","v5.10.64","v5.10.63","v5.10.62","v5.10.61","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.10.60","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.10.59","v5.10.58","v5.10.57","v5.10.56","v5.10.55","v5.13","v5.10.54","v5.10.53","v5.10.52","v5.10.51","v5.10.50","v5.10.49","v5.10.48","v5.13-rc6","v5.10.47","v5.13-rc7","v5.10.46","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.10.45","v5.10.44","v5.13-rc5","v5.10.43","v5.10.42","v5.10.41","v5.10.40","v5.10.39","v5.12","v5.10.38","v5.10.37","v5.10.36","v5.10.35","v5.10.34","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.10.33","v5.10.32","v5.12-rc8","v5.12-rc3","v5.10.31","v5.12-rc7","v5.12-rc5","v5.10.30","v5.12-rc6","v5.10.29","v5.10.28","v5.10.27","v5.12-rc4","v5.10","v5.10.26","v5.10.25","v5.11","v5.10.24","v5.10.23","v5.10.22","v5.10.21","v5.10.20","v5.10.19","v5.10.18","v5.11-rc3","v5.10.17","v5.11-rc7","v5.11-rc6","v5.10.16","v5.11-rc5","v5.11-rc1","v5.10.15","v5.11-rc4","v5.10.14","v5.11-rc2","v5.10.13","v5.10.12","v5.10.11","v5.10.10","v5.10.9","v5.10-rc1","v5.10.8","v5.10.7","v5.10.6","v5.10.5","v5.10.4","v5.10.3","v5.10.2","v5.10.1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4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