CVE-2024-38605 (GCVE-0-2024-38605)

Vulnerability from cvelistv5 – Published: 2024-06-19 13:48 – Updated: 2025-05-04 09:15
VLAI?
Title
ALSA: core: Fix NULL module pointer assignment at card init
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: core: Fix NULL module pointer assignment at card init The commit 81033c6b584b ("ALSA: core: Warn on empty module") introduced a WARN_ON() for a NULL module pointer passed at snd_card object creation, and it also wraps the code around it with '#ifdef MODULE'. This works in most cases, but the devils are always in details. "MODULE" is defined when the target code (i.e. the sound core) is built as a module; but this doesn't mean that the caller is also built-in or not. Namely, when only the sound core is built-in (CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m), the passed module pointer is ignored even if it's non-NULL, and card->module remains as NULL. This would result in the missing module reference up/down at the device open/close, leading to a race with the code execution after the module removal. For addressing the bug, move the assignment of card->module again out of ifdef. The WARN_ON() is still wrapped with ifdef because the module can be really NULL when all sound drivers are built-in. Note that we keep 'ifdef MODULE' for WARN_ON(), otherwise it would lead to a false-positive NULL module check. Admittedly it won't catch perfectly, i.e. no check is performed when CONFIG_SND=y. But, it's no real problem as it's only for debugging, and the condition is pretty rare.
Severity ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < d7ff29a429b56f04783152ad7bbd7233b740e434 (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < e7e0ca200772bdb2fdc6d43d32d341e87a36f811 (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < e007476725730c1a68387b54b7629486d8a8301e (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < e644036a3e2b2c9b3eee3c61b5d31c2ca8b5ba92 (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < c935e72139e6d523defd60fe875c01eb1f9ea5c5 (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < 6b8374ee2cabcf034faa34e69a855dc496a9ec12 (git)
Affected: 81033c6b584b44514cbb16fffc26ca29a0fa6270 , < 39381fe7394e5eafac76e7e9367e7351138a29c1 (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.219 , ≤ 5.10.* (semver)
Unaffected: 5.15.161 , ≤ 5.15.* (semver)
Unaffected: 6.1.93 , ≤ 6.1.* (semver)
Unaffected: 6.6.33 , ≤ 6.6.* (semver)
Unaffected: 6.8.12 , ≤ 6.8.* (semver)
Unaffected: 6.9.3 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"unaffected\", \"version\": \"6.8.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"sound/core/init.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d7ff29a429b56f04783152ad7bbd7233b740e434\"}, {\"url\": \"https://git.kernel.org/stable/c/e7e0ca200772bdb2fdc6d43d32d341e87a36f811\"}, {\"url\": \"https://git.kernel.org/stable/c/e007476725730c1a68387b54b7629486d8a8301e\"}, {\"url\": \"https://git.kernel.org/stable/c/e644036a3e2b2c9b3eee3c61b5d31c2ca8b5ba92\"}, {\"url\": \"https://git.kernel.org/stable/c/c935e72139e6d523defd60fe875c01eb1f9ea5c5\"}, {\"url\": \"https://git.kernel.org/stable/c/6b8374ee2cabcf034faa34e69a855dc496a9ec12\"}, {\"url\": \"https://git.kernel.org/stable/c/39381fe7394e5eafac76e7e9367e7351138a29c1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: core: Fix NULL module pointer assignment at card init\\n\\nThe commit 81033c6b584b (\\\"ALSA: core: Warn on empty module\\\")\\nintroduced a WARN_ON() for a NULL module pointer passed at snd_card\\nobject creation, and it also wraps the code around it with \u0027#ifdef\\nMODULE\u0027.  This works in most cases, but the devils are always in\\ndetails.  \\\"MODULE\\\" is defined when the target code (i.e. the sound\\ncore) is built as a module; but this doesn\u0027t mean that the caller is\\nalso built-in or not.  Namely, when only the sound core is built-in\\n(CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m),\\nthe passed module pointer is ignored even if it\u0027s non-NULL, and\\ncard-\u003emodule remains as NULL.  This would result in the missing module\\nreference up/down at the device open/close, leading to a race with the\\ncode execution after the module removal.\\n\\nFor addressing the bug, move the assignment of card-\u003emodule again out\\nof ifdef.  The WARN_ON() is still wrapped with ifdef because the\\nmodule can be really NULL when all sound drivers are built-in.\\n\\nNote that we keep \u0027ifdef MODULE\u0027 for WARN_ON(), otherwise it would\\nlead to a false-positive NULL module check.  Admittedly it won\u0027t catch\\nperfectly, i.e. no check is performed when CONFIG_SND=y.  But, it\u0027s no\\nreal problem as it\u0027s only for debugging, and the condition is pretty\\nrare.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.12\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.3\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:15:07.886Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-38605\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:15:07.886Z\", \"dateReserved\": \"2024-06-18T19:36:34.934Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T13:48:15.769Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.