CVE-2021-47356 (GCVE-0-2021-47356)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:09
Severity ?
7.7 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible use-after-free in HFC_cleanup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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\"https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7\"}, {\"url\": \"https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5\"}, {\"url\": \"https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124\"}, {\"url\": \"https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0\"}, {\"url\": \"https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d\"}, {\"url\": \"https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020\"}, {\"url\": \"https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda\"}, {\"url\": \"https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmISDN: fix possible use-after-free in HFC_cleanup()\\n\\nThis module\u0027s remove path calls del_timer(). However, that function\\ndoes not wait until the timer handler finishes. This means that the\\ntimer handler may still be running after the driver\u0027s remove function\\nhas finished, which would result in a use-after-free.\\n\\nFix by calling del_timer_sync(), which makes sure the timer handler\\nhas finished, and unable to re-schedule itself.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:40:21.580Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47356\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-01-16T21:05:18.885Z\", \"dateReserved\": \"2024-05-21T14:28:16.987Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:59.097Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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