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CVE-2026-23442 (GCVE-0-2026-23442)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-06-01 16:11
VLAI
Title
ipv6: add NULL checks for idev in SRv6 paths
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: add NULL checks for idev in SRv6 paths __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4 (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < 83d705d35e583cb1b1eacf196dfe7b77d442018e (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < d1bd8b9edc6752d10f84d28ff64f842401ce336d (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < 50352fc103928e10e8729abc79a0d05abef26c4d (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < bc9843c39f9932a8b36efd1d362ea00bb88e4e78 (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < c5cedee5d97382176573bbe21e1724e737a5eb64 (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < a25853c9feea7bbf31d157ff6e004d2d3b4f7f13 (git)
Affected: 1ababeba4a21f3dba3da3523c670b207fb2feb62 , < 06413793526251870e20402c39930804f14d59c0 (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: add NULL checks for idev in SRv6 paths\n\n__in6_dev_get() can return NULL when the device has no IPv6 configuration\n(e.g. MTU \u003c IPV6_MIN_MTU or after NETDEV_UNREGISTER).\n\nAdd NULL checks for idev returned by __in6_dev_get() in both\nseg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL\npointer dereferences."
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            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv6: a\u00f1adir comprobaciones de NULL para idev en las rutas SRv6\n\n__in6_dev_get() puede devolver NULL cuando el dispositivo no tiene configuraci\u00f3n IPv6 (p. ej., MTU \u003c IPV6_MIN_MTU o despu\u00e9s de NETDEV_UNREGISTER).\n\nA\u00f1adir comprobaciones de NULL para idev devuelto por __in6_dev_get() tanto en seg6_hmac_validate_skb() como en ipv6_srh_rcv() para prevenir posibles desreferencias de puntero NULL."
          }
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        "id": "CVE-2026-23442",
        "lastModified": "2026-07-24T21:10:00.143",
        "metrics": {
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                "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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        "published": "2026-04-03T16:16:28.423",
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            "url": "https://git.kernel.org/stable/c/83d705d35e583cb1b1eacf196dfe7b77d442018e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a25853c9feea7bbf31d157ff6e004d2d3b4f7f13"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bc9843c39f9932a8b36efd1d362ea00bb88e4e78"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c5cedee5d97382176573bbe21e1724e737a5eb64"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d1bd8b9edc6752d10f84d28ff64f842401ce336d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-11T10:33:47+00:00",
      "cve": "CVE-2026-23442",
      "id": "CVE-2026-23442",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_affected": "170",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: add NULL checks for idev in SRv6 paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23442.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T16:43:19Z",
      "cve": "CVE-2026-23442",
      "id": "CVE-2026-23442",
      "initial_release_date": "2026-04-03T23:27:43Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "270",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "345",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23442",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23442.json",
      "version": "21"
    }
  }
}



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Taxonomy of the tags.





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.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.