CVE-2025-37949 (GCVE-0-2025-37949)

Vulnerability from cvelistv5 – Published: 2025-05-20 16:01 – Updated: 2026-05-11 21:18
VLAI
Title
xenbus: Use kref to track req lifetime
Summary
In the Linux kernel, the following vulnerability has been resolved: xenbus: Use kref to track req lifetime Marek reported seeing a NULL pointer fault in the xenbus_thread callstack: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Call Trace: <TASK> __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e is req->cb(req). req->cb is set to xs_wake_up(), a thin wrapper around wake_up(), or xenbus_dev_queue_reply(). It seems like it was xs_wake_up() in this case. It seems like req may have woken up the xs_wait_for_reply(), which kfree()ed the req. When xenbus_thread resumes, it faults on the zero-ed data. Linux Device Drivers 2nd edition states: "Normally, a wake_up call can cause an immediate reschedule to happen, meaning that other processes might run before wake_up returns." ... which would match the behaviour observed. Change to keeping two krefs on each request. One for the caller, and one for xenbus_thread. Each will kref_put() when finished, and the last will free it. This use of kref matches the description in Documentation/core-api/kref.rst
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 0e94a246bb6d9538010b6c02d2b1d4717a97b2e5 (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < f1bcac367bc95631afbb918348f30dec887d0e1b (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 4d260a5558df4650eb87bc41b2c9ac2d6b2ba447 (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 8b02f85e84dc6f7c150cef40ddb69af5a25659e5 (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < cbfaf46b88a4c01b64c4186cdccd766c19ae644c (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 8e9c8a0393b5f85f1820c565ab8105660f4e8f92 (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 2466b0f66795c3c426cacc8998499f38031dbb59 (git)
Affected: fd8aa9095a95c02dcc35540a263267c29b8fda9d , < 1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27 (git)
Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.4.294 , ≤ 5.4.* (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.183 , ≤ 5.15.* (semver)
Unaffected: 6.1.139 , ≤ 6.1.* (semver)
Unaffected: 6.6.91 , ≤ 6.6.* (semver)
Unaffected: 6.12.29 , ≤ 6.12.* (semver)
Unaffected: 6.14.7 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37949\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-20T16:15:32.920\",\"lastModified\":\"2025-12-17T20:05:13.020\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxenbus: Use kref to track req lifetime\\n\\nMarek reported seeing a NULL pointer fault in the xenbus_thread\\ncallstack:\\nBUG: kernel NULL pointer dereference, address: 0000000000000000\\nRIP: e030:__wake_up_common+0x4c/0x180\\nCall Trace:\\n \u003cTASK\u003e\\n __wake_up_common_lock+0x82/0xd0\\n process_msg+0x18e/0x2f0\\n xenbus_thread+0x165/0x1c0\\n\\nprocess_msg+0x18e is req-\u003ecb(req).  req-\u003ecb is set to xs_wake_up(), a\\nthin wrapper around wake_up(), or xenbus_dev_queue_reply().  It seems\\nlike it was xs_wake_up() in this case.\\n\\nIt seems like req may have woken up the xs_wait_for_reply(), which\\nkfree()ed the req.  When xenbus_thread resumes, it faults on the zero-ed\\ndata.\\n\\nLinux Device Drivers 2nd edition states:\\n\\\"Normally, a wake_up call can cause an immediate reschedule to happen,\\nmeaning that other processes might run before wake_up returns.\\\"\\n... which would match the behaviour observed.\\n\\nChange to keeping two krefs on each request.  One for the caller, and\\none for xenbus_thread.  Each will kref_put() when finished, and the last\\nwill free it.\\n\\nThis use of kref matches the description in\\nDocumentation/core-api/kref.rst\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xenbus: Usar kref para rastrear el tiempo de vida de req. Marek inform\u00f3 haber visto un fallo de puntero nulo en la pila de llamadas xenbus_thread: ERROR: desreferencia de puntero nulo del kernel, direcci\u00f3n: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Rastreo de llamadas:  __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e es req-\u0026gt;cb(req). req-\u0026gt;cb est\u00e1 configurado como xs_wake_up(), una envoltura ligera alrededor de wake_up(), o xenbus_dev_queue_reply(). Parece que en este caso era xs_wake_up(). Parece que req pudo haber despertado xs_wait_for_reply(), que liber\u00f3 la solicitud. Cuando xenbus_thread se reanuda, falla en los datos con ceros. La segunda edici\u00f3n de los controladores de dispositivos de Linux indica: \u00abNormalmente, una llamada wake_up puede provocar una reprogramaci\u00f3n inmediata, lo que significa que otros procesos podr\u00edan ejecutarse antes de que wake_up regrese\u00bb. ... lo cual coincidir\u00eda con el comportamiento observado. Se recomienda mantener dos krefs en cada solicitud: uno para el que realiza la llamada y otro para xenbus_thread. Cada uno ejecutar\u00e1 kref_put() al finalizar, y el \u00faltimo lo liberar\u00e1. Este uso de kref coincide con la descripci\u00f3n en Documentation/core-api/kref.rst.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"5.4.294\",\"matchCriteriaId\":\"52FE04D3-53CF-427A-9E0F-9F05797D36D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.238\",\"matchCriteriaId\":\"0DAAEF7F-D560-47FC-8B65-20404DB82432\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.183\",\"matchCriteriaId\":\"94D91ED4-346E-41EE-ACF5-F184C0A863D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.139\",\"matchCriteriaId\":\"70A2F216-574B-4B80-86BC-988928D5B83D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.91\",\"matchCriteriaId\":\"B6826C73-C5C9-430D-84C9-4045DFD72074\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.29\",\"matchCriteriaId\":\"7215ABCF-8EB1-46CD-8872-8BCE4890E579\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.14.7\",\"matchCriteriaId\":\"5715A6F5-A34A-4B27-8A64-82825E963995\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8D465631-2980-487A-8E65-40AE2B9F8ED1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4C9D071F-B28E-46EC-AC61-22B913390211\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"13FC0DDE-E513-465E-9E81-515702D49B74\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"8C7B5B0E-4EEB-48F5-B4CF-0935A7633845\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"2D240580-3048-49B2-9E27-F115A9DF8224\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e94a246bb6d9538010b6c02d2b1d4717a97b2e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2466b0f66795c3c426cacc8998499f38031dbb59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4d260a5558df4650eb87bc41b2c9ac2d6b2ba447\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8b02f85e84dc6f7c150cef40ddb69af5a25659e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8e9c8a0393b5f85f1820c565ab8105660f4e8f92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cbfaf46b88a4c01b64c4186cdccd766c19ae644c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1bcac367bc95631afbb918348f30dec887d0e1b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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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.