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GHSA-PFF6-G7WW-P3V3

Vulnerability from github – Published: 2026-03-29 15:30 – Updated: 2026-04-24 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

rust_binder: call set_notification_done() without proc lock

Consider the following sequence of events on a death listener: 1. The remote process dies and sends a BR_DEAD_BINDER message. 2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command. 3. The local process then invokes the BC_DEAD_BINDER_DONE. Then, the kernel will reply to the BC_DEAD_BINDER_DONE command with a BR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper().

However, this can result in a deadlock if the current thread is not a looper. This is because dead_binder_done() still holds the proc lock during set_notification_done(), which called push_work_if_looper(). Normally, push_work_if_looper() takes the thread lock, which is fine to take under the proc lock. But if the current thread is not a looper, then it falls back to delivering the reply to the process work queue, which involves taking the proc lock. Since the proc lock is already held, this is a deadlock.

Fix this by releasing the proc lock during set_notification_done(). It was not intentional that it was held during that function to begin with.

I don't think this ever happens in Android because BC_DEAD_BINDER_DONE is only invoked in response to BR_DEAD_BINDER messages, and the kernel always delivers BR_DEAD_BINDER to a looper. So there's no scenario where Android userspace will call BC_DEAD_BINDER_DONE on a non-looper thread.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23400"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-29T13:16:58Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: call set_notification_done() without proc lock\n\nConsider the following sequence of events on a death listener:\n1. The remote process dies and sends a BR_DEAD_BINDER message.\n2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command.\n3. The local process then invokes the BC_DEAD_BINDER_DONE.\nThen, the kernel will reply to the BC_DEAD_BINDER_DONE command with a\nBR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper().\n\nHowever, this can result in a deadlock if the current thread is not a\nlooper. This is because dead_binder_done() still holds the proc lock\nduring set_notification_done(), which called push_work_if_looper().\nNormally, push_work_if_looper() takes the thread lock, which is fine to\ntake under the proc lock. But if the current thread is not a looper,\nthen it falls back to delivering the reply to the process work queue,\nwhich involves taking the proc lock. Since the proc lock is already\nheld, this is a deadlock.\n\nFix this by releasing the proc lock during set_notification_done(). It\nwas not intentional that it was held during that function to begin with.\n\nI don\u0027t think this ever happens in Android because BC_DEAD_BINDER_DONE\nis only invoked in response to BR_DEAD_BINDER messages, and the kernel\nalways delivers BR_DEAD_BINDER to a looper. So there\u0027s no scenario where\nAndroid userspace will call BC_DEAD_BINDER_DONE on a non-looper thread.",
  "id": "GHSA-pff6-g7ww-p3v3",
  "modified": "2026-04-24T15:32:19Z",
  "published": "2026-03-29T15:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23400"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e303f0febb65a434040774b793ba8356698802b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3be72099067d2cd4a0e089696f19780f75b2b88a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd109e3442817bc03ad1f3ffd541092f8c428141"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-23400 (GCVE-0-2026-23400)

Vulnerability from cvelistv5 – Published: 2026-03-29 12:55 – Updated: 2026-05-11 22:06

Title

rust_binder: call set_notification_done() without proc lock

Summary

In the Linux kernel, the following vulnerability has been resolved: rust_binder: call set_notification_done() without proc lock Consider the following sequence of events on a death listener: 1. The remote process dies and sends a BR_DEAD_BINDER message. 2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command. 3. The local process then invokes the BC_DEAD_BINDER_DONE. Then, the kernel will reply to the BC_DEAD_BINDER_DONE command with a BR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper(). However, this can result in a deadlock if the current thread is not a looper. This is because dead_binder_done() still holds the proc lock during set_notification_done(), which called push_work_if_looper(). Normally, push_work_if_looper() takes the thread lock, which is fine to take under the proc lock. But if the current thread is not a looper, then it falls back to delivering the reply to the process work queue, which involves taking the proc lock. Since the proc lock is already held, this is a deadlock. Fix this by releasing the proc lock during set_notification_done(). It was not intentional that it was held during that function to begin with. I don't think this ever happens in Android because BC_DEAD_BINDER_DONE is only invoked in response to BR_DEAD_BINDER messages, and the kernel always delivers BR_DEAD_BINDER to a looper. So there's no scenario where Android userspace will call BC_DEAD_BINDER_DONE on a non-looper thread.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/dd109e3442817bc03…
https://git.kernel.org/stable/c/3be72099067d2cd4a…
https://git.kernel.org/stable/c/2e303f0febb65a434…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: eafedbc7c050c44744fbdf80bdf3315e860b7513 , < dd109e3442817bc03ad1f3ffd541092f8c428141 (git) Affected: eafedbc7c050c44744fbdf80bdf3315e860b7513 , < 3be72099067d2cd4a0e089696f19780f75b2b88a (git) Affected: eafedbc7c050c44744fbdf80bdf3315e860b7513 , < 2e303f0febb65a434040774b793ba8356698802b (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/binder/process.rs"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "lessThan": "3be72099067d2cd4a0e089696f19780f75b2b88a",
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              "versionType": "git"
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            }
          ]
        },
        {
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          "versions": [
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              "version": "6.18"
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              "version": "0",
              "versionType": "semver"
            },
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            },
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              "lessThanOrEqual": "6.19.*",
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              "versionType": "semver"
            },
            {
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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                }
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          ]
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: call set_notification_done() without proc lock\n\nConsider the following sequence of events on a death listener:\n1. The remote process dies and sends a BR_DEAD_BINDER message.\n2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command.\n3. The local process then invokes the BC_DEAD_BINDER_DONE.\nThen, the kernel will reply to the BC_DEAD_BINDER_DONE command with a\nBR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper().\n\nHowever, this can result in a deadlock if the current thread is not a\nlooper. This is because dead_binder_done() still holds the proc lock\nduring set_notification_done(), which called push_work_if_looper().\nNormally, push_work_if_looper() takes the thread lock, which is fine to\ntake under the proc lock. But if the current thread is not a looper,\nthen it falls back to delivering the reply to the process work queue,\nwhich involves taking the proc lock. Since the proc lock is already\nheld, this is a deadlock.\n\nFix this by releasing the proc lock during set_notification_done(). It\nwas not intentional that it was held during that function to begin with.\n\nI don\u0027t think this ever happens in Android because BC_DEAD_BINDER_DONE\nis only invoked in response to BR_DEAD_BINDER messages, and the kernel\nalways delivers BR_DEAD_BINDER to a looper. So there\u0027s no scenario where\nAndroid userspace will call BC_DEAD_BINDER_DONE on a non-looper thread."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:06:10.668Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2e303f0febb65a434040774b793ba8356698802b"
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      "title": "rust_binder: call set_notification_done() without proc lock",
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    "datePublished": "2026-03-29T12:55:50.660Z",
    "dateReserved": "2026-01-13T15:37:46.012Z",
    "dateUpdated": "2026-05-11T22:06:10.668Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-PFF6-G7WW-P3V3

CVE-2026-23400 (GCVE-0-2026-23400)

Tags

Sightings

Nomenclature