Vulnerability-Lookup

FKIE_CVE-2026-23293

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-05-29 15:04

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. If an IPv6 packet is injected into the interface, route_shortcircuit() is called and a NULL pointer dereference happens on neigh_lookup(). BUG: kernel NULL pointer dereference, address: 0000000000000380 Oops: Oops: 0000 [#1] SMP NOPTI [...] RIP: 0010:neigh_lookup+0x20/0x270 [...] Call Trace: <TASK> vxlan_xmit+0x638/0x1ef0 [vxlan] dev_hard_start_xmit+0x9e/0x2e0 __dev_queue_xmit+0xbee/0x14e0 packet_sendmsg+0x116f/0x1930 __sys_sendto+0x1f5/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x12f/0x1590 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fix this by adding an early check on route_shortcircuit() when protocol is ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because VXLAN can be built-in even when IPv6 is built as a module.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "configurations": [
    {
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n  \u003cTASK\u003e\n  vxlan_xmit+0x638/0x1ef0 [vxlan]\n  dev_hard_start_xmit+0x9e/0x2e0\n  __dev_queue_xmit+0xbee/0x14e0\n  packet_sendmsg+0x116f/0x1930\n  __sys_sendto+0x1f5/0x200\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x12f/0x1590\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: vxlan: corrige la desreferencia de puntero NULL de nd_tbl cuando IPv6 est\u00e1 deshabilitado\n\nAl arrancar con el par\u00e1metro \u0027ipv6.disable=1\u0027, nd_tbl nunca se inicializa porque inet6_init() sale antes de que se llame a ndisc_init(), que es la funci\u00f3n que lo inicializa. Si se inyecta un paquete IPv6 en la interfaz, se llama a route_shortcircuit() y ocurre una desreferencia de puntero NULL en neigh_lookup().\n\nBUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000380\nOops: Oops: 0000 [#1] SMP NOPTI\n[...]\nRIP: 0010:neigh_lookup+0x20/0x270\n[...]\nTraza de Llamadas:\n \n vxlan_xmit+0x638/0x1ef0 [vxlan]\n dev_hard_start_xmit+0x9e/0x2e0\n __dev_queue_xmit+0xbee/0x14e0\n packet_sendmsg+0x116f/0x1930\n __sys_sendto+0x1f5/0x200\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x12f/0x1590\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nEsto se corrige a\u00f1adiendo una verificaci\u00f3n temprana en route_shortcircuit() cuando el protocolo es ETH_P_IPV6. Tenga en cuenta que ipv6_mod_enabled() no se puede usar aqu\u00ed porque VXLAN puede estar integrado incluso cuando IPv6 se compila como un m\u00f3dulo."
    }
  ],
  "id": "CVE-2026-23293",
  "lastModified": "2026-05-29T15:04:45.067",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2026-03-25T11:16:24.520",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-476"
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      "source": "nvd@nist.gov",
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  ]
}

CVE-2026-23293 (GCVE-0-2026-23293)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-05-11 22:04

Title

net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/649e2bb74da54c96c…
https://git.kernel.org/stable/c/dc3e62cf3bbf66280…
https://git.kernel.org/stable/c/b5190fcd75a1f1785…
https://git.kernel.org/stable/c/5f93e6b4d12bd3a45…
https://git.kernel.org/stable/c/f0373e9317bc904e7…
https://git.kernel.org/stable/c/fbbd2118982c55fb9…
https://git.kernel.org/stable/c/abcd48ecdeb2e12ec…
https://git.kernel.org/stable/c/168ff39e4758897d2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < 649e2bb74da54c96cf20729001e283626a2fefa0 (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < b5190fcd75a1f1785c766a8d1e44d3938e168f45 (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < 5f93e6b4d12bd3a4517a6d447ea675f448f21434 (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < fbbd2118982c55fb9b0a753ae0cf7194e77149fb (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < abcd48ecdeb2e12eccb8339a35534c757782afcd (git) Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < 168ff39e4758897d2eee4756977d036d52884c7e (git)
Linux	Linux	Affected: 3.12 Unaffected: 0 , < 3.12 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.77 , ≤ 6.12.* (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "649e2bb74da54c96cf20729001e283626a2fefa0",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n  \u003cTASK\u003e\n  vxlan_xmit+0x638/0x1ef0 [vxlan]\n  dev_hard_start_xmit+0x9e/0x2e0\n  __dev_queue_xmit+0xbee/0x14e0\n  packet_sendmsg+0x116f/0x1930\n  __sys_sendto+0x1f5/0x200\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x12f/0x1590\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:04:04.903Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"
        }
      ],
      "title": "net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23293",
    "datePublished": "2026-03-25T10:26:51.160Z",
    "dateReserved": "2026-01-13T15:37:45.993Z",
    "dateUpdated": "2026-05-11T22:04:04.903Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-23293

CVE-2026-23293 (GCVE-0-2026-23293)

Tags

Sightings

Nomenclature