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CVE-2024-40966 (GCVE-0-2024-40966)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:32 – Updated: 2026-05-11 20:23
VLAI
Title
tty: add the option to have a tty reject a new ldisc
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: add the option to have a tty reject a new ldisc ... and use it to limit the virtual terminals to just N_TTY. They are kind of special, and in particular, the "con_write()" routine violates the "writes cannot sleep" rule that some ldiscs rely on. This avoids the BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 when N_GSM has been attached to a virtual console, and gsmld_write() calls con_write() while holding a spinlock, and con_write() then tries to get the console lock.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:03 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e1eaea46bb4020b38a141b84f88565d4603f8dd0 , < 3c6332f3bb1578b5b10ac2561247b1d6272ae937 (git)
Affected: e1eaea46bb4020b38a141b84f88565d4603f8dd0 , < 287b569a5b914903ba7c438a3c0dbc3410ebb409 (git)
Affected: e1eaea46bb4020b38a141b84f88565d4603f8dd0 , < 5920ac19964f9e20181f63b410d9200ddbf8dc86 (git)
Affected: e1eaea46bb4020b38a141b84f88565d4603f8dd0 , < 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 6.1.96 , ≤ 6.1.* (semver)
Unaffected: 6.6.36 , ≤ 6.6.* (semver)
Unaffected: 6.9.7 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "title": "SUSE CVE CVE-2024-40966",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-40966.json",
      "version": "78"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T21:58:30.295Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-40966\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:03:10.358016Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:22.339Z\"}}], \"cna\": {\"title\": \"tty: add the option to have a tty reject a new ldisc\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e1eaea46bb4020b38a141b84f88565d4603f8dd0\", \"lessThan\": \"3c6332f3bb1578b5b10ac2561247b1d6272ae937\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e1eaea46bb4020b38a141b84f88565d4603f8dd0\", \"lessThan\": \"287b569a5b914903ba7c438a3c0dbc3410ebb409\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e1eaea46bb4020b38a141b84f88565d4603f8dd0\", \"lessThan\": \"5920ac19964f9e20181f63b410d9200ddbf8dc86\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e1eaea46bb4020b38a141b84f88565d4603f8dd0\", \"lessThan\": \"6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/tty/tty_ldisc.c\", \"drivers/tty/vt/vt.c\", \"include/linux/tty_driver.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.35\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.35\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/tty_ldisc.c\", \"drivers/tty/vt/vt.c\", \"include/linux/tty_driver.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937\"}, {\"url\": \"https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409\"}, {\"url\": \"https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86\"}, {\"url\": \"https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntty: add the option to have a tty reject a new ldisc\\n\\n... and use it to limit the virtual terminals to just N_TTY.  They are\\nkind of special, and in particular, the \\\"con_write()\\\" routine violates\\nthe \\\"writes cannot sleep\\\" rule that some ldiscs rely on.\\n\\nThis avoids the\\n\\n   BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659\\n\\nwhen N_GSM has been attached to a virtual console, and gsmld_write()\\ncalls con_write() while holding a spinlock, and con_write() then tries\\nto get the console lock.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.96\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.36\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.7\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"2.6.35\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:36:55.587Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40966\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:36:55.587Z\", \"dateReserved\": \"2024-07-12T12:17:45.602Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:32:06.122Z\", \"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.


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.