CVE-2025-68336 (GCVE-0-2025-68336)

Vulnerability from cvelistv5 – Published: 2025-12-22 16:14 – Updated: 2026-10-16 15:09
VLAI
Title
locking/spinlock/debug: Fix data-race in do_raw_write_lock
Summary
In the Linux kernel, the following vulnerability has been resolved: locking/spinlock/debug: Fix data-race in do_raw_write_lock KCSAN reports: BUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock write (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1: do_raw_write_lock+0x120/0x204 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork read to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0: do_raw_write_lock+0x88/0x204 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork value changed: 0xffffffff -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111 Commit 1a365e822372 ("locking/spinlock/debug: Fix various data races") has adressed most of these races, but seems to be not consistent/not complete. >From do_raw_write_lock() only debug_write_lock_after() part has been converted to WRITE_ONCE(), but not debug_write_lock_before() part. Do it now.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:04 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < 8e5b2cf10844402054b52b489b525dc30cc16908 (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < c228cb699a07a5f2d596d186bc5c314c99bb8bbf (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < 93bd23524d63deb80fb85beb2e43fafeb1043d0f (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < 39d2ef113416f1a4205b03fb0aa2e428d1412c77 (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < b163a5e8c703201c905d6ec7920ed79d167e8442 (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < 16b3590c0e1e615757dade098c8fbc0d4f040c76 (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < 396a9270a7b90886be501611b13aa636f2e8c703 (git)
Affected: 1a365e822372ba24c9da0822bc583894f6f3d821 , < c14ecb555c3ee80eeb030a4e46d00e679537f03a (git)
Affected: 3106fb78d3579c8e9c9b3040f7f7841981919624 (git)
Affected: c0911024ff927ba5c4786b507004cb615be1d776 (git)
Affected: 09226e5c38639437565af01e6009a9286a351d04 (git)
Affected: c7673f01604fa722b9d7c1e29e17cec1b8ae09c5 (git)
Affected: c120c3dbeb76305235c8e557f84d9e2d7d0f5933 (git)
Affected: 4.4.209 , < 4.5 (semver)
Affected: 4.9.209 , < 4.10 (semver)
Affected: 4.14.164 , < 4.15 (semver)
Affected: 4.19.95 , < 4.20 (semver)
Affected: 5.4.11 , < 5.5 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/spinlock/debug: Fix data-race in do_raw_write_lock\n\nKCSAN reports:\n\nBUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock\n\nwrite (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1:\n do_raw_write_lock+0x120/0x204\n _raw_write_lock_irq\n do_exit\n call_usermodehelper_exec_async\n ret_from_fork\n\nread to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0:\n do_raw_write_lock+0x88/0x204\n _raw_write_lock_irq\n do_exit\n call_usermodehelper_exec_async\n ret_from_fork\n\nvalue changed: 0xffffffff -\u003e 0x00000001\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111\n\nCommit 1a365e822372 (\"locking/spinlock/debug: Fix various data races\") has\nadressed most of these races, but seems to be not consistent/not complete.\n\n\u003eFrom do_raw_write_lock() only debug_write_lock_after() part has been\nconverted to WRITE_ONCE(), but not debug_write_lock_before() part.\nDo it now."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:N - An unauthenticated remote peer can open and terminate concurrent TCP/445 connections to an enabled ksmbd server; its per-connection kthreads exit through do_exit(), tasklist_lock, and do_raw_write_lock().\nAC:L - The attacker controls both sides of the race using simultaneous connections and can repeat attempts until it occurs, without requiring victim-controlled state.\nPR:N - Ksmbd creates connection-handler threads before SMB authentication, so the remote attacker requires neither an account nor kernel privileges.\nUI:N - Once the server is listening, remote connections trigger the complete vulnerable path without victim interaction.\nS:U - A resulting kernel panic or lockup affects the same host security authority and does not cross a virtualization or sandbox boundary.\nC:N - The race concerns in-bounds debug owner bookkeeping and provides no memory-disclosure or arbitrary-read primitive.\nI:N - The actual rwlock and protected data are not corrupted; the fix only annotates existing reads and does not address an overwrite, use-after-free, or control-flow primitive.\nA:H - On DEBUG_SPINLOCK and KCSAN builds, repeated races can generate reports that panic through panic_on_warn or deadlock the console, causing complete system unavailability."
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      "title": "locking/spinlock/debug: Fix data-race in do_raw_write_lock",
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    "cveId": "CVE-2025-68336",
    "datePublished": "2025-12-22T16:14:13.425Z",
    "dateReserved": "2025-12-16T14:48:05.297Z",
    "dateUpdated": "2026-10-16T15:09:43.012Z",
    "state": "PUBLISHED"
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      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-68336.json",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/spinlock/debug: Fix data-race in do_raw_write_lock\n\nKCSAN reports:\n\nBUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock\n\nwrite (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1:\n do_raw_write_lock+0x120/0x204\n _raw_write_lock_irq\n do_exit\n call_usermodehelper_exec_async\n ret_from_fork\n\nread to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0:\n do_raw_write_lock+0x88/0x204\n _raw_write_lock_irq\n do_exit\n call_usermodehelper_exec_async\n ret_from_fork\n\nvalue changed: 0xffffffff -\u003e 0x00000001\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111\n\nCommit 1a365e822372 (\"locking/spinlock/debug: Fix various data races\") has\nadressed most of these races, but seems to be not consistent/not complete.\n\n\u003eFrom do_raw_write_lock() only debug_write_lock_after() part has been\nconverted to WRITE_ONCE(), but not debug_write_lock_before() part.\nDo it now."
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            "value": "En el kernel de Linux, se ha corregido la siguiente vulnerabilidad:\\n\\nlocking/spinlock/debug: Fix data-race in do_raw_write_lock\\n\\nInformes de KCSAN:\\n\\nBUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock\\n\\nwrite (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1:\\n do_raw_write_lock+0x120/0x204\\n _raw_write_lock_irq\\n do_exit\\n call_usermodehelper_exec_async\\n ret_from_fork\\n\\nread to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0:\\n do_raw_write_lock+0x88/0x204\\n _raw_write_lock_irq\\n do_exit\\n call_usermodehelper_exec_async\\n ret_from_fork\\n\\nvalue changed: 0xffffffff  -mayor que 0x00000001\\n\\nReportado por Kernel Concurrency Sanitizer el:\\nCPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111\\n\\nEl commit 1a365e822372 (\\\u201clocking/spinlock/debug: Fix various data races\\\u201d) ha abordado la mayor parte de estas carreras, pero parece no ser consistente/no estar completo.\\n\\n\u003eDesde do_raw_write_lock() solo la parte debug_write_lock_after() se ha\\nconvertido a WRITE_ONCE(), pero la parte debug_write_lock_before() no.\\nHazlo ahora."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2025-68336",
        "datePublished": "2025-12-22T16:14:13.425Z",
        "dateReserved": "2025-12-16T14:48:05.297Z",
        "dateUpdated": "2026-10-16T15:09:43.012Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.