{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a11106544f33c104706ae42d27219a409b67478e"
            },
            {
              "fixed": "c0c7722308c5f303117d8bd555290fdf26b098da"
            },
            {
              "fixed": "67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28"
            },
            {
              "fixed": "9a515e00b00132b6fc3f1dd62dc5204bbda8cb10"
            },
            {
              "fixed": "5397142d60aa29dcf636f5459d960bfc4f97c42a"
            },
            {
              "fixed": "b89477077c834d94381c7bf07d81193bebefcff9"
            },
            {
              "fixed": "73711688479df333acc134e3730fff1acba1843e"
            },
            {
              "fixed": "b504fd953664c3f4d176ae8cb594adb3fda9d577"
            },
            {
              "fixed": "81e3a86030462824a67d697739cf3f387f4ba350"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.34"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80626.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/perf: fix preempt count underflow in fsl_emb_pmu_del\n\nfsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at\nthe 'out:' label, but only calls the matching get_cpu_var() after the\n'i \u003c 0' early-return check. When event-\u003ehw.idx is negative the\nfunction jumps to 'out:' without having taken get_cpu_var(), and the\ntrailing put_cpu_var() then issues an unmatched preempt_enable(),\nunderflowing preempt_count.\n\nOn a CONFIG_PREEMPT=y kernel preempt_count would underflow and\neventually present as a 'scheduling while atomic' BUG.\n\nMove put_cpu_var() to pair with get_cpu_var() so the percpu access is\ncorrectly bracketed and the 'out:' label only handles perf_pmu_enable.",
  "id": "CVE-2026-80626",
  "modified": "2026-08-30T03:30:59.152945634Z",
  "published": "2026-08-28T06:48:44.182Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5397142d60aa29dcf636f5459d960bfc4f97c42a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73711688479df333acc134e3730fff1acba1843e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81e3a86030462824a67d697739cf3f387f4ba350"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a515e00b00132b6fc3f1dd62dc5204bbda8cb10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b504fd953664c3f4d176ae8cb594adb3fda9d577"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b89477077c834d94381c7bf07d81193bebefcff9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0c7722308c5f303117d8bd555290fdf26b098da"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80626.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80626"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del"
}