CVE-2025-68336 (GCVE-0-2025-68336)
Vulnerability from cvelistv5
Published
2025-12-22 16:14
Modified
2026-10-16 15:09
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 1a365e822372ba24c9da0822bc583894f6f3d821
Version: 3106fb78d3579c8e9c9b3040f7f7841981919624
Version: c0911024ff927ba5c4786b507004cb615be1d776
Version: 09226e5c38639437565af01e6009a9286a351d04
Version: c7673f01604fa722b9d7c1e29e17cec1b8ae09c5
Version: c120c3dbeb76305235c8e557f84d9e2d7d0f5933
Version: 4.4.209   ≤
Version: 4.9.209   ≤
Version: 4.14.164   ≤
Version: 4.19.95   ≤
Version: 5.4.11   ≤
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          "lang": "en",
          "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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/c228cb699a07a5f2d596d186bc5c314c99bb8bbf"
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          "url": "https://git.kernel.org/stable/c/c14ecb555c3ee80eeb030a4e46d00e679537f03a"
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      "title": "locking/spinlock/debug: Fix data-race in do_raw_write_lock",
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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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\"git\"}, {\"status\": \"affected\", \"version\": \"c7673f01604fa722b9d7c1e29e17cec1b8ae09c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c120c3dbeb76305235c8e557f84d9e2d7d0f5933\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.4.209\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.9.209\", \"lessThan\": \"4.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.164\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.95\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.11\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}], \"programFiles\": [\"kernel/locking/spinlock_debug.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.248\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.62\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/locking/spinlock_debug.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8e5b2cf10844402054b52b489b525dc30cc16908\"}, {\"url\": \"https://git.kernel.org/stable/c/c228cb699a07a5f2d596d186bc5c314c99bb8bbf\"}, {\"url\": \"https://git.kernel.org/stable/c/93bd23524d63deb80fb85beb2e43fafeb1043d0f\"}, {\"url\": \"https://git.kernel.org/stable/c/39d2ef113416f1a4205b03fb0aa2e428d1412c77\"}, {\"url\": \"https://git.kernel.org/stable/c/b163a5e8c703201c905d6ec7920ed79d167e8442\"}, {\"url\": \"https://git.kernel.org/stable/c/16b3590c0e1e615757dade098c8fbc0d4f040c76\"}, {\"url\": \"https://git.kernel.org/stable/c/396a9270a7b90886be501611b13aa636f2e8c703\"}, {\"url\": \"https://git.kernel.org/stable/c/c14ecb555c3ee80eeb030a4e46d00e679537f03a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.62\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.12\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.1\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.209\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.209\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.164\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.95\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:10:54.280Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-68336\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T15:09:43.012Z\", \"dateReserved\": \"2025-12-16T14:48:05.297Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-22T16:14:13.425Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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