{"id":"CVE-2026-31546","state":"PUBLISHED","title":"net: bonding: fix NULL deref in bond_debug_rlb_hash_show","description":"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->slave 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->slave\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.","publishedAt":"2026-04-24T14:33:14.572Z","updatedAt":"2026-10-15T01:16:58.231Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"19f0fd87df0e5746b24f5caa465a66a8c6e6e241","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"edacf1613f7b26423ebfa8b2892e7453c4235354","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"2ec2c777f357a83c3d503d8d9370c90b60f0ae63","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"0a3f8cd3f370247ded14d38d216b49dd30eade76","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"017d674cf6930e9586a29ee808c7ca09d1396d07","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"605b52497bf89b3b154674deb135da98f916e390","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_debugfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_debugfs.c"]}],"references":["https://git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241","https://git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354","https://git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63","https://git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76","https://git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4","https://git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07","https://git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c","https://git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31546.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31546","state":"PUBLISHED","datePublished":"2026-04-24T14:33:14.572Z","dateUpdated":"2026-10-15T01:16:58.231Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.114Z"},"containers":{"cna":{"title":"net: bonding: fix NULL deref in bond_debug_rlb_hash_show","descriptions":[{"lang":"en","value":"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->slave 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->slave\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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"19f0fd87df0e5746b24f5caa465a66a8c6e6e241","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"edacf1613f7b26423ebfa8b2892e7453c4235354","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"2ec2c777f357a83c3d503d8d9370c90b60f0ae63","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"0a3f8cd3f370247ded14d38d216b49dd30eade76","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"017d674cf6930e9586a29ee808c7ca09d1396d07","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c","versionType":"git"},{"version":"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3","status":"affected","lessThan":"605b52497bf89b3b154674deb135da98f916e390","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_debugfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_debugfs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241"},{"url":"https://git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354"},{"url":"https://git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63"},{"url":"https://git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76"},{"url":"https://git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4"},{"url":"https://git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07"},{"url":"https://git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c"},{"url":"https://git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:10:52.103Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC 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