CVE-2026-80777

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-04 16:18:03.373000

Last modified

2026-10-19 09:17:11.790000

View original CVE JSON

{
  "id": "CVE-2026-80777",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-04T16:18:03.373",
  "lastModified": "2026-10-19T09:17:11.790",
  "vulnStatus": "Received",
  "cveTags": [],
  "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's mm, which is stored in\nthe futex_key and copied into the pi_state, is the same as the owner's 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 = ->mm;\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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "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",
          "versions": [
            {
              "version": "80367ad01d93ac781b0e1df246edaf006928002f",
              "lessThan": "fdf538b2e69653ff740e84042245018e5680cd7b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "80367ad01d93ac781b0e1df246edaf006928002f",
              "lessThan": "0478bc6bf197629fea0331d65b39eeea043c6cf0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "80367ad01d93ac781b0e1df246edaf006928002f",
              "lessThan": "d7944cee62ec6cca1c90780a766960a57d3b4bb8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "80367ad01d93ac781b0e1df246edaf006928002f",
              "lessThan": "c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "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",
          "versions": [
            {
              "version": "6.16",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.47",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.11",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.1",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0478bc6bf197629fea0331d65b39eeea043c6cf0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d7944cee62ec6cca1c90780a766960a57d3b4bb8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fdf538b2e69653ff740e84042245018e5680cd7b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}