Vulnerability-Lookup

RHSA-2026:74442

Vulnerability from csaf_redhat - Published: 2026-10-01 11:32 - Updated: 2026-10-02 04:51

Summary

Red Hat Security Advisory: libpcap security update

Severity

Important

Notes

Topic: An update for libpcap is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The libpcap packages provide a portable framework for low-level network monitoring. The libpcap library provides network statistics collection, security monitoring, and network debugging. Security Fix(es): * libpcap: libpcap: Out-of-bounds read and write vulnerability allows arbitrary memory access (CVE-2026-0799) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-0799

A flaw was found in libpcap. The Berkeley Packet Filter (BPF) interpreter in libpcap does not properly validate register indexes in BPF instructions. A local attacker could craft a malicious filter program to trigger an out-of-bounds read and write vulnerability. This could allow the attacker to read and write arbitrary operating system process memory, potentially leading to information disclosure or arbitrary code execution.

8.7 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

CWE-125 - Out-of-bounds Read

Affected products

Fixed 25 products

Product	Version	Remediation
Unresolved product id: BaseOS-10.2.Z:libpcap-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-14:1.10.4-7.el10_2.1.src	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debuginfo-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-debugsource-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.x86_64	—	Vendor Fix fix

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:74442	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2529093	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-0799	self
https://bugzilla.redhat.com/show_bug.cgi?id=2529093	external
https://www.cve.org/CVERecord?id=CVE-2026-0799	external
https://nvd.nist.gov/vuln/detail/CVE-2026-0799	external
https://github.com/the-tcpdump-group/libpcap/comm…	external

JSON

To clipboard

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            "CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.ppc64le",
            "CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.s390x",
            "CRB-10.2.Z:libpcap-devel-14:1.10.4-7.el10_2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libpcap: libpcap: Out-of-bounds read and write vulnerability allows arbitrary memory access"
    }
  ]
}

CVE-2026-0799 (GCVE-0-2026-0799)

Vulnerability from cvelistv5 – Published: 2026-09-05 18:48 – Updated: 2026-09-08 18:20

Title

OOBR and OOBW in libpcap before 1.10.7

Summary

In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

Severity

8.7 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 18:20 UTC

CWE

CWE-129 - Improper Validation of Array Index
CWE-125 - Out-of-bounds Read
CWE-787 - Out-of-bounds Write

Assigner

Tcpdump mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/the-tcpdump-group/libpcap/comm…	patch

Impacted products

1 product

Vendor	Product	Version
The Tcpdump Group	libpcap	Affected: 0 , < 1.10.7 (semver)

Credits

Mozilla via the Secure Open Source program Include Security Denis Ovsienko

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-0799",
                "options": [
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T18:20:35.280967Z",
                "version": "2.0.3"
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          ],
          "programRoutines": [
            {
              "name": "pcapint_filter_with_aux_data()"
            }
          ],
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          "vendor": "The Tcpdump Group",
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              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
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          "lang": "en",
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        }
      ],
      "credits": [
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          "lang": "en",
          "type": "sponsor",
          "value": "Mozilla via the Secure Open Source program"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Include Security"
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        {
          "lang": "en",
          "type": "analyst",
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      "descriptions": [
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          "lang": "en",
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        }
      ],
      "exploits": [
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          "value": "A functional exploit exists."
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      ],
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
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          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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          "descriptions": [
            {
              "cweId": "CWE-129",
              "description": "CWE-129 Improper Validation of Array Index",
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          ]
        },
        {
          "descriptions": [
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          ]
        },
        {
          "descriptions": [
            {
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              "lang": "en",
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-05T18:48:39.126Z",
        "orgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896",
        "shortName": "Tcpdump"
      },
      "references": [
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          "tags": [
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          "url": "https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to libpcap 1.10.7."
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      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "OOBR and OOBW in libpcap before 1.10.7",
      "workarounds": [
        {
          "lang": "en",
          "value": "Validate every filter program that has not been produced by a local call to pcap_compile()."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
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  },
  "cveMetadata": {
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    "assignerShortName": "Tcpdump",
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    "dateReserved": "2026-01-08T23:19:31.855Z",
    "dateUpdated": "2026-09-08T18:20:50.106Z",
    "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.
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

RHSA-2026:74442

CVE-2026-0799 (GCVE-0-2026-0799)

Tags

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Nomenclature

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