bpf: Fix linked reg delta tracking when src_reg == dst_reg

{
  "id": "e95dcf0bfeb01cd32ec6317514278096584eeac1fb1b18dc41fd4c416aad34f7",
  "url": "https://osv.dev/vulnerability/CVE-2026-53092",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix linked reg delta tracking when src_reg == dst_reg",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix linked reg delta tracking when src_reg == dst_reg Consider the case of rX += rX where src_reg and dst_reg are pointers to the same bpf_reg_state in adjust_reg_min_max_vals(). The latter first modifies the dst_reg in-place, and later in the delta tracking, the subsequent is_reg_const(src_reg)/reg_const_value(src_reg) reads the post-{add,sub} value instead of the original source. This is problematic since it sets an incorrect delta, which sync_linked_regs() then propagates to linked registers, thus creating a verifier-vs-runtime mismatch. Fix it by just skipping this corner case.",
    "evidence": "osv:CVE-2026-53092",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.105",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53092",
      "aliases": [
        "CVE-2026-53092"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "98d7ca374ba4b39e7535613d40e159f09ca14da2"
                },
                {
                  "fixed": "1509c1ae9185ec7103899967ed788b6eebab3fcc"
                },
                {
                  "fixed": "d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066"
                },
                {
                  "fixed": "cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de"
                },
                {
                  "fixed": "d7f14173c0d5866c3cae759dee560ad1bed10d2e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53092.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.12.105"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.33"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53092.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.634686834Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1509c1ae9185ec7103899967ed788b6eebab3fcc",
        "https://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de",
        "https://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e",
        "https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53092.json",
        "https://access.redhat.com/security/cve/CVE-2026-53092",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53092.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53092",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492362",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53092.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53092",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518114,
  "published_at": "2026-06-24T16:30:31.168+00:00"
}