CVE-2026-31508 (GCVE-0-2026-31508)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-04-27 14:03
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: Avoid releasing netdev before teardown completes The patch cited in the Fixes tag below changed the teardown code for OVS ports to no longer unconditionally take the RTNL. After this change, the netdev_destroy() callback can proceed immediately to the call_rcu() invocation if the IFF_OVS_DATAPATH flag is already cleared on the netdev. The ovs_netdev_detach_dev() function clears the flag before completing the unregistration, and if it gets preempted after clearing the flag (as can happen on an -rt kernel), netdev_destroy() can complete and the device can be freed before the unregistration completes. This leads to a splat like: [ 998.393867] Oops: general protection fault, probably for non-canonical address 0xff00000001000239: 0000 [#1] SMP PTI [ 998.393877] CPU: 42 UID: 0 PID: 55177 Comm: ip Kdump: loaded Not tainted 6.12.0-211.1.1.el10_2.x86_64+rt #1 PREEMPT_RT [ 998.393886] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS 2.24.0 03/27/2025 [ 998.393889] RIP: 0010:dev_set_promiscuity+0x8d/0xa0 [ 998.393901] Code: 00 00 75 d8 48 8b 53 08 48 83 ba b0 02 00 00 00 75 ca 48 83 c4 08 5b c3 cc cc cc cc 48 83 bf 48 09 00 00 00 75 91 48 8b 47 08 <48> 83 b8 b0 02 00 00 00 74 97 eb 81 0f 1f 80 00 00 00 00 90 90 90 [ 998.393906] RSP: 0018:ffffce5864a5f6a0 EFLAGS: 00010246 [ 998.393912] RAX: ff00000000ffff89 RBX: ffff894d0adf5a05 RCX: 0000000000000000 [ 998.393917] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff894d0adf5a05 [ 998.393921] RBP: ffff894d19252000 R08: ffff894d19252000 R09: 0000000000000000 [ 998.393924] R10: ffff894d19252000 R11: ffff894d192521b8 R12: 0000000000000006 [ 998.393927] R13: ffffce5864a5f738 R14: 00000000ffffffe2 R15: 0000000000000000 [ 998.393931] FS: 00007fad61971800(0000) GS:ffff894cc0140000(0000) knlGS:0000000000000000 [ 998.393936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 998.393940] CR2: 000055df0a2a6e40 CR3: 000000011c7fe003 CR4: 00000000007726f0 [ 998.393944] PKRU: 55555554 [ 998.393946] Call Trace: [ 998.393949] <TASK> [ 998.393952] ? show_trace_log_lvl+0x1b0/0x2f0 [ 998.393961] ? show_trace_log_lvl+0x1b0/0x2f0 [ 998.393975] ? dp_device_event+0x41/0x80 [openvswitch] [ 998.394009] ? __die_body.cold+0x8/0x12 [ 998.394016] ? die_addr+0x3c/0x60 [ 998.394027] ? exc_general_protection+0x16d/0x390 [ 998.394042] ? asm_exc_general_protection+0x26/0x30 [ 998.394058] ? dev_set_promiscuity+0x8d/0xa0 [ 998.394066] ? ovs_netdev_detach_dev+0x3a/0x80 [openvswitch] [ 998.394092] dp_device_event+0x41/0x80 [openvswitch] [ 998.394102] notifier_call_chain+0x5a/0xd0 [ 998.394106] unregister_netdevice_many_notify+0x51b/0xa60 [ 998.394110] rtnl_dellink+0x169/0x3e0 [ 998.394121] ? rt_mutex_slowlock.constprop.0+0x95/0xd0 [ 998.394125] rtnetlink_rcv_msg+0x142/0x3f0 [ 998.394128] ? avc_has_perm_noaudit+0x69/0xf0 [ 998.394130] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 998.394132] netlink_rcv_skb+0x50/0x100 [ 998.394138] netlink_unicast+0x292/0x3f0 [ 998.394141] netlink_sendmsg+0x21b/0x470 [ 998.394145] ____sys_sendmsg+0x39d/0x3d0 [ 998.394149] ___sys_sendmsg+0x9a/0xe0 [ 998.394156] __sys_sendmsg+0x7a/0xd0 [ 998.394160] do_syscall_64+0x7f/0x170 [ 998.394162] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 998.394165] RIP: 0033:0x7fad61bf4724 [ 998.394188] Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d c5 e9 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89 [ 998.394189] RSP: 002b:00007ffd7e2f7cb8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 998.394191] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fad61bf4724 [ 998.394193] RDX: 0000000000000000 RSI: 00007ffd7e2f7d20 RDI: 0000000000000003 [ 998.394194] RBP: 00007ffd7e2f7d90 R08: 0000000000000010 R09: 000000000000003f [ 998.394195] R10: 000055df11558010 R11: 0000000000000202 R12: 00007ffd7e2 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: b823c3344d5446b720227ba561df10a4f0add515
Version: 052e5db5be4576e0a8ef1460b210da5f328f4cd1
Version: c98263d5ace597c096a7a60aeef790da7b54979e
Version: 0fc642f011cb7a7eff41109e66d3b552e9f4d795
Version: 5116f61ab11846844585c9082c547c4ccd97ff1a
Version: f31557fb1b35332cca9994aa196cef284bcf3807
Version: 5498227676303e3ffa9a3a46214af96bc3e81314
Version: 5498227676303e3ffa9a3a46214af96bc3e81314
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/vport-netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "5.10.248",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.15.198",
                  "vulnerable": true
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                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "6.1.160",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.131",
                  "versionStartIncluding": "6.6.120",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "6.12.64",
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                },
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                  "versionEndExcluding": "6.18.21",
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                },
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                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: Avoid releasing netdev before teardown completes\n\nThe patch cited in the Fixes tag below changed the teardown code for\nOVS ports to no longer unconditionally take the RTNL. After this change,\nthe netdev_destroy() callback can proceed immediately to the call_rcu()\ninvocation if the IFF_OVS_DATAPATH flag is already cleared on the\nnetdev.\n\nThe ovs_netdev_detach_dev() function clears the flag before completing\nthe unregistration, and if it gets preempted after clearing the flag (as\ncan happen on an -rt kernel), netdev_destroy() can complete and the\ndevice can be freed before the unregistration completes. This leads to a\nsplat like:\n\n[  998.393867] Oops: general protection fault, probably for non-canonical address 0xff00000001000239: 0000 [#1] SMP PTI\n[  998.393877] CPU: 42 UID: 0 PID: 55177 Comm: ip Kdump: loaded Not tainted 6.12.0-211.1.1.el10_2.x86_64+rt #1 PREEMPT_RT\n[  998.393886] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS 2.24.0 03/27/2025\n[  998.393889] RIP: 0010:dev_set_promiscuity+0x8d/0xa0\n[  998.393901] Code: 00 00 75 d8 48 8b 53 08 48 83 ba b0 02 00 00 00 75 ca 48 83 c4 08 5b c3 cc cc cc cc 48 83 bf 48 09 00 00 00 75 91 48 8b 47 08 \u003c48\u003e 83 b8 b0 02 00 00 00 74 97 eb 81 0f 1f 80 00 00 00 00 90 90 90\n[  998.393906] RSP: 0018:ffffce5864a5f6a0 EFLAGS: 00010246\n[  998.393912] RAX: ff00000000ffff89 RBX: ffff894d0adf5a05 RCX: 0000000000000000\n[  998.393917] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff894d0adf5a05\n[  998.393921] RBP: ffff894d19252000 R08: ffff894d19252000 R09: 0000000000000000\n[  998.393924] R10: ffff894d19252000 R11: ffff894d192521b8 R12: 0000000000000006\n[  998.393927] R13: ffffce5864a5f738 R14: 00000000ffffffe2 R15: 0000000000000000\n[  998.393931] FS:  00007fad61971800(0000) GS:ffff894cc0140000(0000) knlGS:0000000000000000\n[  998.393936] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  998.393940] CR2: 000055df0a2a6e40 CR3: 000000011c7fe003 CR4: 00000000007726f0\n[  998.393944] PKRU: 55555554\n[  998.393946] Call Trace:\n[  998.393949]  \u003cTASK\u003e\n[  998.393952]  ? show_trace_log_lvl+0x1b0/0x2f0\n[  998.393961]  ? show_trace_log_lvl+0x1b0/0x2f0\n[  998.393975]  ? dp_device_event+0x41/0x80 [openvswitch]\n[  998.394009]  ? __die_body.cold+0x8/0x12\n[  998.394016]  ? die_addr+0x3c/0x60\n[  998.394027]  ? exc_general_protection+0x16d/0x390\n[  998.394042]  ? asm_exc_general_protection+0x26/0x30\n[  998.394058]  ? dev_set_promiscuity+0x8d/0xa0\n[  998.394066]  ? ovs_netdev_detach_dev+0x3a/0x80 [openvswitch]\n[  998.394092]  dp_device_event+0x41/0x80 [openvswitch]\n[  998.394102]  notifier_call_chain+0x5a/0xd0\n[  998.394106]  unregister_netdevice_many_notify+0x51b/0xa60\n[  998.394110]  rtnl_dellink+0x169/0x3e0\n[  998.394121]  ? rt_mutex_slowlock.constprop.0+0x95/0xd0\n[  998.394125]  rtnetlink_rcv_msg+0x142/0x3f0\n[  998.394128]  ? avc_has_perm_noaudit+0x69/0xf0\n[  998.394130]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n[  998.394132]  netlink_rcv_skb+0x50/0x100\n[  998.394138]  netlink_unicast+0x292/0x3f0\n[  998.394141]  netlink_sendmsg+0x21b/0x470\n[  998.394145]  ____sys_sendmsg+0x39d/0x3d0\n[  998.394149]  ___sys_sendmsg+0x9a/0xe0\n[  998.394156]  __sys_sendmsg+0x7a/0xd0\n[  998.394160]  do_syscall_64+0x7f/0x170\n[  998.394162]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  998.394165] RIP: 0033:0x7fad61bf4724\n[  998.394188] Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d c5 e9 0c 00 00 74 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\n[  998.394189] RSP: 002b:00007ffd7e2f7cb8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e\n[  998.394191] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fad61bf4724\n[  998.394193] RDX: 0000000000000000 RSI: 00007ffd7e2f7d20 RDI: 0000000000000003\n[  998.394194] RBP: 00007ffd7e2f7d90 R08: 0000000000000010 R09: 000000000000003f\n[  998.394195] R10: 000055df11558010 R11: 0000000000000202 R12: 00007ffd7e2\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:03:46.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/df3c95be76103604e752131d9495a24814915ece"
        },
        {
          "url": "https://git.kernel.org/stable/c/33609454be4f582e686a4bf13d4482a5ca0f6c4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fdeaf591a0942772c2d18ff3563697a49ad01c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/43579baa17270aa51f93eb09b6e4af6e047b7f6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/95265232b49765a4d00f4d028c100bb7185600f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/755a6300afbd743cda4b102f24f343380ec0e0ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c770dadfda5cbbde6aa3c4363ed513f1d212bf8"
        }
      ],
      "title": "net: openvswitch: Avoid releasing netdev before teardown completes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31508",
    "datePublished": "2026-04-22T13:54:26.599Z",
    "dateReserved": "2026-03-09T15:48:24.106Z",
    "dateUpdated": "2026-04-27T14:03:46.048Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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