CVE-2026-80777 (GCVE-0-2026-80777)
Vulnerability from cvelistv5
Published
2026-09-04 15:12
Modified
2026-10-19 08:43
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 80367ad01d93ac781b0e1df246edaf006928002f
Version: 80367ad01d93ac781b0e1df246edaf006928002f
Version: 80367ad01d93ac781b0e1df246edaf006928002f
Version: 80367ad01d93ac781b0e1df246edaf006928002f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/exec.c",
            "include/linux/futex.h",
            "kernel/futex/core.c",
            "kernel/futex/pi.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
          "programFiles": [
            "fs/exec.c",
            "include/linux/futex.h",
            "kernel/futex/core.c",
            "kernel/futex/pi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "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": "6.18.47",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex/pi: Plug private futex exec() race\n\nThe check for private futexes whether the waiter\u0027s mm, which is stored in\nthe futex_key and copied into the pi_state, is the same as the owner\u0027s mm\nis not sufficient for exec(). exec() has a gap where the mm check fails to\ngive the correct answer:\n\n  exec()\n  ...\n    exec_release_mm()\n      futex_exec_release()\n        tsk::futex::exit_state = EXITING;\n        cleanup_robust_list();\n1)      tsk::futex::exit_state = OK;\n    ...\n    old_mm = tsk::mm;\n2)  tsk::mm = -\u003emm;\n\nBetween #1 and #2 the check for the mm is wrong as that mm is about to be\nswapped out and eventually freed.\n\nPlug this gap by:\n\n  1) Setting tsk::futex::exit_state to FUTEX_STATE_DEAD in\n     futex_exec_release()\n\n  2) Setting tsk::futex::exit_state to FUTEX_STATE_OK after\n     the mm has been switched.\n\nFrom a futex point of view the task is dead after it finished the robust\nlist cleanup up to the point where it sets the state to OK again."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:43:32.707Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fdf538b2e69653ff740e84042245018e5680cd7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0478bc6bf197629fea0331d65b39eeea043c6cf0"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7944cee62ec6cca1c90780a766960a57d3b4bb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc"
        }
      ],
      "title": "futex/pi: Plug private futex exec() race",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80777",
    "datePublished": "2026-09-04T15:12:49.215Z",
    "dateReserved": "2026-08-26T14:34:25.792Z",
    "dateUpdated": "2026-10-19T08:43:32.707Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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