CVE-2026-31546 (GCVE-0-2026-31546)
Vulnerability from cvelistv5
Published
2026-04-24 14:33
Modified
2026-04-24 14:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix NULL deref in bond_debug_rlb_hash_show rlb_clear_slave intentionally keeps RLB hash-table entries on the rx_hashtbl_used_head list with slave set to NULL when no replacement slave is available. However, bond_debug_rlb_hash_show visites client_info->slave without checking if it's NULL. Other used-list iterators in bond_alb.c already handle this NULL-slave state safely: - rlb_update_client returns early on !client_info->slave - rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance compare slave values before visiting - lb_req_update_subnet_clients continues if slave is NULL The following NULL deref crash can be trigger in bond_debug_rlb_hash_show: [ 1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41) [ 1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286 [ 1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204 [ 1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078 [ 1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000 [ 1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0 [ 1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8 [ 1.294864] FS: 0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000 [ 1.295239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0 [ 1.295897] Call Trace: [ 1.296134] seq_read_iter (fs/seq_file.c:231) [ 1.296341] seq_read (fs/seq_file.c:164) [ 1.296493] full_proxy_read (fs/debugfs/file.c:378 (discriminator 1)) [ 1.296658] vfs_read (fs/read_write.c:572) [ 1.296981] ksys_read (fs/read_write.c:717) [ 1.297132] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) [ 1.297325] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Add a NULL check and print "(none)" for entries with no assigned slave.
References
Impacted products
Vendor Product Version
Linux Linux Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
Version: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_debugfs.c"
          ],
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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-\u003eslave without checking if it\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:33:14.572Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "net: bonding: fix NULL deref in bond_debug_rlb_hash_show",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31546",
    "datePublished": "2026-04-24T14:33:14.572Z",
    "dateReserved": "2026-03-09T15:48:24.114Z",
    "dateUpdated": "2026-04-24T14:33:14.572Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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