CVE-2021-47527 (GCVE-0-2021-47527)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-05-11 13:56
VLAI
Title
serial: core: fix transmit-buffer reset and memleak
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: core: fix transmit-buffer reset and memleak Commit 761ed4a94582 ("tty: serial_core: convert uart_close to use tty_port_close") converted serial core to use tty_port_close() but failed to notice that the transmit buffer still needs to be freed on final close. Not freeing the transmit buffer means that the buffer is no longer cleared on next open so that any ioctl() waiting for the buffer to drain might wait indefinitely (e.g. on termios changes) or that stale data can end up being transmitted in case tx is restarted. Furthermore, the buffer of any port that has been opened would leak on driver unbind. Note that the port lock is held when clearing the buffer pointer due to the ldisc race worked around by commit a5ba1d95e46e ("uart: fix race between uart_put_char() and uart_shutdown()"). Also note that the tty-port shutdown() callback is not called for console ports so it is not strictly necessary to free the buffer page after releasing the lock (cf. d72402145ace ("tty/serial: do not free trasnmit buffer page under port lock")).
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-10 18:53 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < 011f6c92b5bf6e1fbfdedc8b5232f64c1c493206 (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < e74d9663fd57640fc3394abb5c76fa95b9cc2f2e (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < 1179b168fa3f3a6aae3bd140000455a0e58457db (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < c5da8aa441053958594f94254592bb41264bdfbf (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < e1722acf4f0d4d67b60f57e08ce16f8b66cd4b8f (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < 64e491c1634b73d3bddc081d08620bdc92ab2c12 (git)
Affected: 761ed4a94582ab291aa24dcbea4e01e8936488c8 , < 00de977f9e0aa9760d9a79d1e41ff780f74e3424 (git)
Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.9.292 , ≤ 4.9.* (semver)
Unaffected: 4.14.257 , ≤ 4.14.* (semver)
Unaffected: 4.19.220 , ≤ 4.19.* (semver)
Unaffected: 5.4.164 , ≤ 5.4.* (semver)
Unaffected: 5.10.84 , ≤ 5.10.* (semver)
Unaffected: 5.15.7 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: fix transmit-buffer reset and memleak\n\nCommit 761ed4a94582 (\"tty: serial_core: convert uart_close to use\ntty_port_close\") converted serial core to use tty_port_close() but\nfailed to notice that the transmit buffer still needs to be freed on\nfinal close.\n\nNot freeing the transmit buffer means that the buffer is no longer\ncleared on next open so that any ioctl() waiting for the buffer to drain\nmight wait indefinitely (e.g. on termios changes) or that stale data can\nend up being transmitted in case tx is restarted.\n\nFurthermore, the buffer of any port that has been opened would leak on\ndriver unbind.\n\nNote that the port lock is held when clearing the buffer pointer due to\nthe ldisc race worked around by commit a5ba1d95e46e (\"uart: fix race\nbetween uart_put_char() and uart_shutdown()\").\n\nAlso note that the tty-port shutdown() callback is not called for\nconsole ports so it is not strictly necessary to free the buffer page\nafter releasing the lock (cf. d72402145ace (\"tty/serial: do not free\ntrasnmit buffer page under port lock\"))."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T13:56:23.332Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/011f6c92b5bf6e1fbfdedc8b5232f64c1c493206"
            },
            {
              "url": "https://git.kernel.org/stable/c/e74d9663fd57640fc3394abb5c76fa95b9cc2f2e"
            },
            {
              "url": "https://git.kernel.org/stable/c/1179b168fa3f3a6aae3bd140000455a0e58457db"
            },
            {
              "url": "https://git.kernel.org/stable/c/c5da8aa441053958594f94254592bb41264bdfbf"
            },
            {
              "url": "https://git.kernel.org/stable/c/e1722acf4f0d4d67b60f57e08ce16f8b66cd4b8f"
            },
            {
              "url": "https://git.kernel.org/stable/c/64e491c1634b73d3bddc081d08620bdc92ab2c12"
            },
            {
              "url": "https://git.kernel.org/stable/c/00de977f9e0aa9760d9a79d1e41ff780f74e3424"
            }
          ],
          "title": "serial: core: fix transmit-buffer reset and memleak",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47527",
        "datePublished": "2024-05-24T15:09:38.690Z",
        "dateReserved": "2024-05-24T15:02:54.825Z",
        "dateUpdated": "2026-05-11T13:56:23.332Z",
        "state": "PUBLISHED"
      },
      "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

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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.