Vulnerability-Lookup

FKIE_CVE-2026-23083

Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-03-18 13:40

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: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03	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	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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  "cveTags": [],
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don\u0027t allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou_udp_recv() nor \"resubmit\"-ted in ip_protocol_deliver_rcu().\n\nLet\u0027s forbid 0 for FOU_ATTR_IPPROTO."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfou: No permitir 0 para FOU_ATTR_IPPROTO.\n\nfou_udp_recv() tiene el mismo problema mencionado en el parche anterior.\n\nSi FOU_ATTR_IPPROTO se establece en 0, skb no es liberado por fou_udp_recv() ni \u0027reenviado\u0027 en ip_protocol_deliver_rcu().\n\nProhibamos 0 para FOU_ATTR_IPPROTO."
    }
  ],
  "id": "CVE-2026-23083",
  "lastModified": "2026-03-18T13:40:23.277",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-02-04T17:16:19.163",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

CVE-2026-23083 (GCVE-0-2026-23083)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-09 08:38

Title

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/c7498f9bc390479cc…
	https://git.kernel.org/stable/c/611ef4bd9c73d9e6d…
	https://git.kernel.org/stable/c/6e983789b7588ee59…
	https://git.kernel.org/stable/c/1cc98b8887cabb180…
	https://git.kernel.org/stable/c/b7db31a52c3862a1a…
	https://git.kernel.org/stable/c/9b75dff8446ec8710…
	https://git.kernel.org/stable/c/7a9bc9e3f42391e4c…

Impacted products

Vendor

Product

Version

Linux

Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < c7498f9bc390479ccfad7c7f2332237ff4945b03 (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < 611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < 6e983789b7588ee59cbf303583546c043bad8e19 (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < 1cc98b8887cabb1808d2f4a37cd10a7be7574771 (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < b7db31a52c3862a1a32202a273a4c32e7f5f4823 (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < 9b75dff8446ec871030d8daf5a69e74f5fe8b956 (git)
Affected: 23461551c00628c3f3fe9cf837bf53cf8f212b63 , < 7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5 (git)

Linux

Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "Documentation/netlink/specs/fou.yaml",
            "net/ipv4/fou_nl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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      "providerMetadata": {
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          "url": "https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5"
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      "title": "fou: Don\u0027t allow 0 for FOU_ATTR_IPPROTO.",
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    "datePublished": "2026-02-04T16:08:07.561Z",
    "dateReserved": "2026-01-13T15:37:45.960Z",
    "dateUpdated": "2026-02-09T08:38:23.034Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-2026-23083

CVE-2026-23083 (GCVE-0-2026-23083)

Tags

Sightings

Nomenclature