CVE-2022-49904 (GCVE-0-2022-49904)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-05-23 15:23
VLAI
Title
net, neigh: Fix null-ptr-deref in neigh_table_clear()
Summary
In the Linux kernel, the following vulnerability has been resolved: net, neigh: Fix null-ptr-deref in neigh_table_clear() When IPv6 module gets initialized but hits an error in the middle, kenel panic with: KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 16:01 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9bbaed571c4bf1b62ac8703cb359dc090efc3455 , < 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 (git)
Affected: 05fdce1ae744dee43c9181fd063c9c0db4f777f2 , < b736592de2aa53aee2d48d6b129bc0c892007bbe (git)
Affected: 51be9dd391fd25872b95708a0250f2f7722d2d8e , < b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c (git)
Affected: c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 , < 1c89642e7f2b7ecc9635610653f5c2f0276c0051 (git)
Affected: db6fa03d80ab076238fc806c9925d1f8b9639d1b , < 2b45d6d0c41cb9593868e476681efb1aae5078a1 (git)
Affected: 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 , < a99a8ec4c62180c889482a2ff6465033e0743458 (git)
Affected: 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 , < f8017317cb0b279b8ab98b0f3901a2e0ac880dad (git)
Affected: 2dd5ed474115150d8175825bc3b56c6385c3a83b (git)
Affected: 4.14.292 , < 4.14.299 (semver)
Affected: 4.19.257 , < 4.19.265 (semver)
Affected: 5.4.212 , < 5.4.224 (semver)
Affected: 5.10.141 , < 5.10.154 (semver)
Affected: 5.15.65 , < 5.15.78 (semver)
Affected: 5.19.7 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 4.14.299 , ≤ 4.14.* (semver)
Unaffected: 4.19.265 , ≤ 4.19.* (semver)
Unaffected: 5.4.224 , ≤ 5.4.* (semver)
Unaffected: 5.10.154 , ≤ 5.10.* (semver)
Unaffected: 5.15.78 , ≤ 5.15.* (semver)
Unaffected: 6.0.8 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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                  },
                  {
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, neigh: Fix null-ptr-deref in neigh_table_clear()\n\nWhen IPv6 module gets initialized but hits an error in the middle,\nkenel panic with:\n\nKASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f]\nCPU: 1 PID: 361 Comm: insmod\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nRIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370\nRSP: 0018:ffff888012677908 EFLAGS: 00000202\n...\nCall Trace:\n \u003cTASK\u003e\n neigh_table_clear+0x94/0x2d0\n ndisc_cleanup+0x27/0x40 [ipv6]\n inet6_init+0x21c/0x2cb [ipv6]\n do_one_initcall+0xd3/0x4d0\n do_init_module+0x1ae/0x670\n...\nKernel panic - not syncing: Fatal exception\n\nWhen ipv6 initialization fails, it will try to cleanup and calls:\n\nneigh_table_clear()\n  neigh_ifdown(tbl, NULL)\n    pneigh_queue_purge(\u0026tbl-\u003eproxy_queue, dev_net(dev == NULL))\n    # dev_net(NULL) triggers null-ptr-deref.\n\nFix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev\nis NULL, to make kernel not panic immediately."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net, neigh: Fix null-ptr-deref en neigh_table_clear() Cuando se inicializa un m\u00f3dulo IPv6 pero se produce un error en el medio, kenel entra en p\u00e1nico con: KASAN: null-ptr-deref en el rango [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Seguimiento de llamadas:  neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... P\u00e1nico del kernel - no sincroniza: Excepci\u00f3n fatal Cuando falla la inicializaci\u00f3n de ipv6, intentar\u00e1 limpiar y llamar\u00e1 a: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(\u0026amp;tbl-\u0026gt;proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) activa null-ptr-deref. Corr\u00edjalo pasando NULL a pneigh_queue_purge() en neigh_ifdown() si dev es NULL, para que el kernel no entre en p\u00e1nico inmediatamente."
          }
        ],
        "id": "CVE-2022-49904",
        "lastModified": "2026-06-17T05:19:28.487",
        "metrics": {
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              "cvssData": {
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    "redhat_vex": {
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      "current_release_date": "2026-06-29T21:29:59+00:00",
      "cve": "CVE-2022-49904",
      "id": "CVE-2022-49904",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "232",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net, neigh: Fix null-ptr-deref in neigh_table_clear()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49904.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:24:49Z",
      "cve": "CVE-2022-49904",
      "id": "CVE-2022-49904",
      "initial_release_date": "2025-05-09T04:54:21Z",
      "product_status:known_not_affected": "505",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49904",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49904.json",
      "version": "9"
    },
    "vulnrichment": {
      "containers": {
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                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
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                  "content": {
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                    "options": [
                      {
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                    "version": "2.0.3"
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            ],
            "problemTypes": [
              {
                "descriptions": [
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                    "description": "CWE-476 NULL Pointer Dereference",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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              ]
            },
            {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "6.0"
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                  "status": "unaffected",
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                  "status": "unaffected",
                  "version": "6.0.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.1",
                  "versionType": "original_commit_for_fix"
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              ]
            }
          ],
          "cpeApplicability": [
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              "nodes": [
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, neigh: Fix null-ptr-deref in neigh_table_clear()\n\nWhen IPv6 module gets initialized but hits an error in the middle,\nkenel panic with:\n\nKASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f]\nCPU: 1 PID: 361 Comm: insmod\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nRIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370\nRSP: 0018:ffff888012677908 EFLAGS: 00000202\n...\nCall Trace:\n \u003cTASK\u003e\n neigh_table_clear+0x94/0x2d0\n ndisc_cleanup+0x27/0x40 [ipv6]\n inet6_init+0x21c/0x2cb [ipv6]\n do_one_initcall+0xd3/0x4d0\n do_init_module+0x1ae/0x670\n...\nKernel panic - not syncing: Fatal exception\n\nWhen ipv6 initialization fails, it will try to cleanup and calls:\n\nneigh_table_clear()\n  neigh_ifdown(tbl, NULL)\n    pneigh_queue_purge(\u0026tbl-\u003eproxy_queue, dev_net(dev == NULL))\n    # dev_net(NULL) triggers null-ptr-deref.\n\nFix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev\nis NULL, to make kernel not panic immediately."
            }
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            "dateUpdated": "2026-05-23T15:23:11.729Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "dateReserved": "2025-05-01T14:05:17.245Z",
        "dateUpdated": "2026-05-23T15:23:11.729Z",
        "state": "PUBLISHED"
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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