{"id":"CVE-2026-31546","summary":"net: bonding: fix NULL deref in bond_debug_rlb_hash_show","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL deref in bond_debug_rlb_hash_show\n\nrlb_clear_slave intentionally keeps RLB hash-table entries on\nthe rx_hashtbl_used_head list with slave set to NULL when no\nreplacement slave is available. However, bond_debug_rlb_hash_show\nvisites client_info-\u003eslave without checking if it's NULL.\n\nOther used-list iterators in bond_alb.c already handle this NULL-slave\nstate safely:\n\n- rlb_update_client returns early on !client_info-\u003eslave\n- rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance\ncompare slave values before visiting\n- lb_req_update_subnet_clients continues if slave is NULL\n\nThe following NULL deref crash can be trigger in\nbond_debug_rlb_hash_show:\n\n[    1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[    1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41)\n[    1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286\n[    1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204\n[    1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078\n[    1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000\n[    1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0\n[    1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8\n[    1.294864] FS:  0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000\n[    1.295239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0\n[    1.295897] Call Trace:\n[    1.296134]  seq_read_iter (fs/seq_file.c:231)\n[    1.296341]  seq_read (fs/seq_file.c:164)\n[    1.296493]  full_proxy_read (fs/debugfs/file.c:378 (discriminator 1))\n[    1.296658]  vfs_read (fs/read_write.c:572)\n[    1.296981]  ksys_read (fs/read_write.c:717)\n[    1.297132]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n[    1.297325]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd a NULL check and print \"(none)\" for entries with no assigned slave.","modified":"2026-05-28T03:52:57.123677737Z","published":"2026-04-24T14:33:14.572Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31546.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76"},{"type":"WEB","url":"https://git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31546.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31546"},{"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":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3"},{"fixed":"19f0fd87df0e5746b24f5caa465a66a8c6e6e241"},{"fixed":"edacf1613f7b26423ebfa8b2892e7453c4235354"},{"fixed":"2ec2c777f357a83c3d503d8d9370c90b60f0ae63"},{"fixed":"0a3f8cd3f370247ded14d38d216b49dd30eade76"},{"fixed":"6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4"},{"fixed":"017d674cf6930e9586a29ee808c7ca09d1396d07"},{"fixed":"ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c"},{"fixed":"605b52497bf89b3b154674deb135da98f916e390"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31546.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.38"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31546.json"}}],"schema_version":"1.7.5"}