CVE-2023-52638 (GCVE-0-2023-52638)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2026-05-11 19:30
VLAI
Title
can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock
Summary
In the Linux kernel, the following vulnerability has been resolved: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock The following 3 locks would race against each other, causing the deadlock situation in the Syzbot bug report: - j1939_socks_lock - active_session_list_lock - sk_session_queue_lock A reasonable fix is to change j1939_socks_lock to an rwlock, since in the rare situations where a write lock is required for the linked list that j1939_socks_lock is protecting, the code does not attempt to acquire any more locks. This would break the circular lock dependency, where, for example, the current thread already locks j1939_socks_lock and attempts to acquire sk_session_queue_lock, and at the same time, another thread attempts to acquire j1939_socks_lock while holding sk_session_queue_lock. NOTE: This patch along does not fix the unregister_netdevice bug reported by Syzbot; instead, it solves a deadlock situation to prepare for one or more further patches to actually fix the Syzbot bug, which appears to be a reference counting problem within the j1939 codebase. [mkl: remove unrelated newline change]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 03358aba991668d3bb2c65b3c82aa32c36851170 (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < aedda066d717a0b4335d7e0a00b2e3a61e40afcf (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 26dfe112ec2e95fe0099681f6aec33da13c2dd8e (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 559b6322f9480bff68cfa98d108991e945a4f284 (git)
Affected: 5b9272e93f2efe3f6cda60cc2c26817b2ce49386 , < 6cdedc18ba7b9dacc36466e27e3267d201948c8d (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-01-14T15:57:54+00:00",
      "cve": "CVE-2023-52638",
      "id": "CVE-2023-52638",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "1537",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "115",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52638.json",
      "version": "3"
    },
    "vulnrichment": {
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This would break the circular lock dependency,\\nwhere, for example, the current thread already locks j1939_socks_lock\\nand attempts to acquire sk_session_queue_lock, and at the same time,\\nanother thread attempts to acquire j1939_socks_lock while holding\\nsk_session_queue_lock.\\n\\nNOTE: This patch along does not fix the unregister_netdevice bug\\nreported by Syzbot; instead, it solves a deadlock situation to prepare\\nfor one or more further patches to actually fix the Syzbot bug, which\\nappears to be a reference counting problem within the j1939 codebase.\\n\\n[mkl: remove unrelated newline change]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.79\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.18\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.6\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:16:55.570Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52638\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:16:55.570Z\", \"dateReserved\": \"2024-03-06T09:52:12.093Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:54:41.271Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.