FKIE_CVE-2026-99244

Vulnerability from fkie_nvd - Published: 2026-11-03 12:17 - Updated: 2026-11-03 20:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper Since commit 7fea700e04bd ("zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING") zap_pid_ns_processes() clears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise kernel_wait4() doesn't sleep and returns -ERESTARTSYS if signal_pending() is true and the reaper busy-waits. But clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again. For example, klp_send_signals() sets it raw against any task that hasn't transitioned yet. And it keeps sending it until the livepatch finishes. The sleep loop waiting for pid_allocated to drop has the same problem and it doesn't even clear anything. So a schedule() in TASK_INTERRUPTIBLE returns immediately. Use a no_notify_signal guard. signal_pending() will ignore TIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child exits or free_pid() wakes it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/pid_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2c20ace1698d03a23467351be1d281e89b36ade3",
              "status": "affected",
              "version": "edd2754a62bee8d97b4808a15de024f66a1ddccf",
              "versionType": "git"
            },
            {
              "lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212",
              "status": "affected",
              "version": "3466abafa9f4f81a869da828e52a12f693175ec2",
              "versionType": "git"
            },
            {
              "lessThan": "30b274508c743f243c82904954c4e416d7143d4c",
              "status": "affected",
              "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
              "versionType": "git"
            },
            {
              "lessThan": "70178691c467c8f9f722765299fd8524c3121a35",
              "status": "affected",
              "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
              "versionType": "git"
            },
            {
              "lessThan": "3d15ac36ce174477efa5365e424dbd47950fd2b9",
              "status": "affected",
              "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
              "versionType": "git"
            },
            {
              "lessThan": "f46cd8241d9b83f2279cc0db3e9d3e181b548a59",
              "status": "affected",
              "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
              "versionType": "git"
            },
            {
              "lessThan": "5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2",
              "status": "affected",
              "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.191",
              "status": "affected",
              "version": "6.1.95",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.161",
              "status": "affected",
              "version": "6.6.35",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.221",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.162",
              "versionType": "semver"
            },
            {
              "lessThan": "6.10",
              "status": "affected",
              "version": "6.9.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/pid_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.3.*",
              "status": "unaffected",
              "version": "7.3.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.4-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper\n\nSince commit 7fea700e04bd (\"zap_pid_ns_processes: clear\nTIF_NOTIFY_SIGNAL along with TIF_SIGPENDING\") zap_pid_ns_processes()\nclears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise\nkernel_wait4() doesn\u0027t sleep and returns -ERESTARTSYS if\nsignal_pending() is true and the reaper busy-waits.\n\nBut clearing TIF_NOTIFY_SIGNAL doesn\u0027t fix it. It can get raised again.\nFor example, klp_send_signals() sets it raw against any task that hasn\u0027t\ntransitioned yet. And it keeps sending it until the livepatch finishes.\n\nThe sleep loop waiting for pid_allocated to drop has the same problem\nand it doesn\u0027t even clear anything. So a schedule() in\nTASK_INTERRUPTIBLE returns immediately.\n\nUse a no_notify_signal guard. signal_pending() will ignore\nTIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child\nexits or free_pid() wakes it."
    }
  ],
  "id": "CVE-2026-99244",
  "lastModified": "2026-11-03T20:18:30.743",
  "metrics": {},
  "published": "2026-11-03T12:17:30.710",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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