Vulnerability-Lookup

GHSA-VJ6F-V49F-R83X

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 18:31

Details

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

srcu: Use irq_work to start GP in tiny SRCU

Tiny SRCU's srcu_gp_start_if_needed() directly calls schedule_work(), which acquires the workqueue pool->lock.

This causes a lockdep splat when call_srcu() is called with a scheduler lock held, due to:

call_srcu() [holding pi_lock] srcu_gp_start_if_needed() schedule_work() -> pool->lock

workqueue_init() / create_worker() [holding pool->lock] wake_up_process() -> try_to_wake_up() -> pi_lock

Also add irq_work_sync() to cleanup_srcu_struct() to prevent a use-after-free if a queued irq_work fires after cleanup begins.

Tested with rcutorture SRCU-T and no lockdep warnings.

[ Thanks to Boqun for similar fix in patch "rcu: Use an intermediate irq_work to start process_srcu()" ]

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-2026-43115"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:25Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsrcu: Use irq_work to start GP in tiny SRCU\n\nTiny SRCU\u0027s srcu_gp_start_if_needed() directly calls schedule_work(),\nwhich acquires the workqueue pool-\u003elock.\n\nThis causes a lockdep splat when call_srcu() is called with a scheduler\nlock held, due to:\n\n  call_srcu() [holding pi_lock]\n    srcu_gp_start_if_needed()\n      schedule_work() -\u003e pool-\u003elock\n\n  workqueue_init() / create_worker() [holding pool-\u003elock]\n    wake_up_process() -\u003e try_to_wake_up() -\u003e pi_lock\n\nAlso add irq_work_sync() to cleanup_srcu_struct() to prevent a\nuse-after-free if a queued irq_work fires after cleanup begins.\n\nTested with rcutorture SRCU-T and no lockdep warnings.\n\n[ Thanks to Boqun for similar fix in patch \"rcu: Use an intermediate irq_work\nto start process_srcu()\" ]",
  "id": "GHSA-vj6f-v49f-r83x",
  "modified": "2026-05-08T18:31:26Z",
  "published": "2026-05-06T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43115"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6fc88b22bc8d12ad52e8412c667ec0f5bf055af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb37286db65368cb72ba8757ad86299c4e4a73fc"
    }
  ],
  "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-2026-43115 (GCVE-0-2026-43115)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:18

Title

srcu: Use irq_work to start GP in tiny SRCU

Summary

In the Linux kernel, the following vulnerability has been resolved: srcu: Use irq_work to start GP in tiny SRCU Tiny SRCU's srcu_gp_start_if_needed() directly calls schedule_work(), which acquires the workqueue pool->lock. This causes a lockdep splat when call_srcu() is called with a scheduler lock held, due to: call_srcu() [holding pi_lock] srcu_gp_start_if_needed() schedule_work() -> pool->lock workqueue_init() / create_worker() [holding pool->lock] wake_up_process() -> try_to_wake_up() -> pi_lock Also add irq_work_sync() to cleanup_srcu_struct() to prevent a use-after-free if a queued irq_work fires after cleanup begins. Tested with rcutorture SRCU-T and no lockdep warnings. [ Thanks to Boqun for similar fix in patch "rcu: Use an intermediate irq_work to start process_srcu()" ]

Severity ?

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/bb37286db65368cb7…
https://git.kernel.org/stable/c/a6fc88b22bc8d12ad…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d8be81735aa89413b333de488251f0e64e2be591 , < bb37286db65368cb72ba8757ad86299c4e4a73fc (git) Affected: d8be81735aa89413b333de488251f0e64e2be591 , < a6fc88b22bc8d12ad52e8412c667ec0f5bf055af (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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      "affected": [
        {
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          "programFiles": [
            "include/linux/srcutiny.h",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "d8be81735aa89413b333de488251f0e64e2be591",
              "versionType": "git"
            }
          ]
        },
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          "defaultStatus": "affected",
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            "include/linux/srcutiny.h",
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          "vendor": "Linux",
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              "versionType": "semver"
            },
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
        {
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                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsrcu: Use irq_work to start GP in tiny SRCU\n\nTiny SRCU\u0027s srcu_gp_start_if_needed() directly calls schedule_work(),\nwhich acquires the workqueue pool-\u003elock.\n\nThis causes a lockdep splat when call_srcu() is called with a scheduler\nlock held, due to:\n\n  call_srcu() [holding pi_lock]\n    srcu_gp_start_if_needed()\n      schedule_work() -\u003e pool-\u003elock\n\n  workqueue_init() / create_worker() [holding pool-\u003elock]\n    wake_up_process() -\u003e try_to_wake_up() -\u003e pi_lock\n\nAlso add irq_work_sync() to cleanup_srcu_struct() to prevent a\nuse-after-free if a queued irq_work fires after cleanup begins.\n\nTested with rcutorture SRCU-T and no lockdep warnings.\n\n[ Thanks to Boqun for similar fix in patch \"rcu: Use an intermediate irq_work\nto start process_srcu()\" ]"
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    "datePublished": "2026-05-06T07:40:40.541Z",
    "dateReserved": "2026-05-01T14:12:55.986Z",
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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-VJ6F-V49F-R83X

CVE-2026-43115 (GCVE-0-2026-43115)

Tags

Sightings

Nomenclature