CVE-2026-98627 (GCVE-0-2026-98627)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
bpf: Preserve packet pointer class displacement in regsafe()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve packet pointer class displacement in regsafe() regsafe() maps packet pointer IDs between states and checks that each current register range is a subset of the corresponding explored register range. It does not, however, preserve the displacement between registers that share a packet pointer ID. This is unsound because packet range is shared by ID. A bounds check on one class member updates every member, and a later access can consume the range through another member. Commit 022ac0750883 ("bpf: use reg->var_off instead of reg->off for pointers") folded the fixed pointer offset into r64 and removed the old off equality check, so two individually narrower registers can prune even when their displacement has changed. The explored path can then license an out-of-bounds packet access on the pruned path. Require matching range bases for packet pointers with an ID. Together with the existing ID mapping, this preserves the displacement between members of each packet-pointer class without adding per-ID state. Packet pointers without an ID remain unaffected.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 022ac075088366b62e130da5e1b200bc93a47191 , < 091b40845bd3cf96791171ca95113e9184ccb596 (git)
Affected: 022ac075088366b62e130da5e1b200bc93a47191 , < fd16449a9b3b31a8f18944c2f0e29e4e218ca2cf (git)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/states.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "091b40845bd3cf96791171ca95113e9184ccb596",
              "status": "affected",
              "version": "022ac075088366b62e130da5e1b200bc93a47191",
              "versionType": "git"
            },
            {
              "lessThan": "fd16449a9b3b31a8f18944c2f0e29e4e218ca2cf",
              "status": "affected",
              "version": "022ac075088366b62e130da5e1b200bc93a47191",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/states.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve packet pointer class displacement in regsafe()\n\nregsafe() maps packet pointer IDs between states and checks that each\ncurrent register range is a subset of the corresponding explored\nregister range. It does not, however, preserve the displacement between\nregisters that share a packet pointer ID.\n\nThis is unsound because packet range is shared by ID. A bounds check on\none class member updates every member, and a later access can consume the\nrange through another member. Commit 022ac0750883 (\"bpf: use reg-\u003evar_off\ninstead of reg-\u003eoff for pointers\") folded the fixed pointer offset into\nr64 and removed the old off equality check, so two individually narrower\nregisters can prune even when their displacement has changed. The\nexplored path can then license an out-of-bounds packet access on the\npruned path.\n\nRequire matching range bases for packet pointers with an ID. Together\nwith the existing ID mapping, this preserves the displacement between\nmembers of each packet-pointer class without adding per-ID state.\nPacket pointers without an ID remain unaffected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:55.260Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/091b40845bd3cf96791171ca95113e9184ccb596"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd16449a9b3b31a8f18944c2f0e29e4e218ca2cf"
        }
      ],
      "title": "bpf: Preserve packet pointer class displacement in regsafe()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98627",
    "datePublished": "2026-10-18T15:19:48.952Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:22:55.260Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98627",
      "date": "2026-10-27",
      "epss": "0.00156",
      "percentile": "0.0469"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/bpf/states.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "091b40845bd3cf96791171ca95113e9184ccb596",
                    "status": "affected",
                    "version": "022ac075088366b62e130da5e1b200bc93a47191",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "fd16449a9b3b31a8f18944c2f0e29e4e218ca2cf",
                    "status": "affected",
                    "version": "022ac075088366b62e130da5e1b200bc93a47191",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "kernel/bpf/states.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.1"
                  },
                  {
                    "lessThan": "7.1",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.9",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve packet pointer class displacement in regsafe()\n\nregsafe() maps packet pointer IDs between states and checks that each\ncurrent register range is a subset of the corresponding explored\nregister range. It does not, however, preserve the displacement between\nregisters that share a packet pointer ID.\n\nThis is unsound because packet range is shared by ID. A bounds check on\none class member updates every member, and a later access can consume the\nrange through another member. Commit 022ac0750883 (\"bpf: use reg-\u003evar_off\ninstead of reg-\u003eoff for pointers\") folded the fixed pointer offset into\nr64 and removed the old off equality check, so two individually narrower\nregisters can prune even when their displacement has changed. The\nexplored path can then license an out-of-bounds packet access on the\npruned path.\n\nRequire matching range bases for packet pointers with an ID. Together\nwith the existing ID mapping, this preserves the displacement between\nmembers of each packet-pointer class without adding per-ID state.\nPacket pointers without an ID remain unaffected."
          }
        ],
        "id": "CVE-2026-98627",
        "lastModified": "2026-10-19T10:19:26.953",
        "metrics": {},
        "published": "2026-10-18T16:17:15.760",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/091b40845bd3cf96791171ca95113e9184ccb596"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fd16449a9b3b31a8f18944c2f0e29e4e218ca2cf"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-21T14:32:04+00:00",
      "cve": "CVE-2026-98627",
      "id": "CVE-2026-98627",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Preserve packet pointer class displacement in regsafe()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98627.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-22T16:36:23Z",
      "cve": "CVE-2026-98627",
      "id": "CVE-2026-98627",
      "initial_release_date": "2026-10-18T23:44:29Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98627",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98627.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.