futex/pi: Plug private futex exec() race

{
  "id": "d858bc0f7d5ed804e456f4c06bbb765074b025e1a6cff7c3d50ff2883220ae22",
  "url": "https://osv.dev/vulnerability/CVE-2026-80777",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "futex/pi: Plug private futex exec() race",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: futex/pi: Plug private futex exec() race The check for private futexes whether the waiter's mm, which is stored in the futex_key and copied into the pi_state, is the same as the owner's mm is not sufficient for exec(). exec() has a gap where the mm check fails to give the correct answer: exec() ... exec_release_mm() futex_exec_release() tsk::futex::exit_state = EXITING; cleanup_robust_list(); 1) tsk::futex::exit_state = OK; ... old_mm = tsk::mm; 2) tsk::mm = ->mm; Between #1 and #2 the check for the mm is wrong as that mm is about to be swapped out and eventually freed. Plug this gap by: 1) Setting tsk::futex::exit_state to FUTEX_STATE_DEAD in futex_exec_release() 2) Setting tsk::futex::exit_state to FUTEX_STATE_OK after the mm has been switched. From a futex point of view the task is dead after it finished the robust list cleanup up to the point where it sets the state to OK again.",
    "evidence": "osv:CVE-2026-80777",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80777",
      "aliases": [
        "CVE-2026-80777"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "80367ad01d93ac781b0e1df246edaf006928002f"
                },
                {
                  "fixed": "fdf538b2e69653ff740e84042245018e5680cd7b"
                },
                {
                  "fixed": "0478bc6bf197629fea0331d65b39eeea043c6cf0"
                },
                {
                  "fixed": "d7944cee62ec6cca1c90780a766960a57d3b4bb8"
                },
                {
                  "fixed": "c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80777.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.47"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.2.0"
                },
                {
                  "fixed": "7.2.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80777.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.592494289Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0478bc6bf197629fea0331d65b39eeea043c6cf0",
        "https://git.kernel.org/stable/c/c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc",
        "https://git.kernel.org/stable/c/d7944cee62ec6cca1c90780a766960a57d3b4bb8",
        "https://git.kernel.org/stable/c/fdf538b2e69653ff740e84042245018e5680cd7b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80777.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80777",
        "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/2026/80xxx/CVE-2026-80777.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80777",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503947,
  "published_at": "2026-09-04T15:12:49.215+00:00"
}