gsd - gsd-2021-47527

GSD-2021-47527

Vulnerability from gsd

Aliases

CVE-2021-47527

{
  "GSD": {
    "alias": "CVE-2021-47527",
    "id": "GSD-2021-47527",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-47527.html"
    ]
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}

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

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2025-05-04 07:12

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.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/011f6c92b5bf6e1fb…
	https://git.kernel.org/stable/c/e74d9663fd57640fc…
	https://git.kernel.org/stable/c/1179b168fa3f3a6aa…
	https://git.kernel.org/stable/c/c5da8aa4410539585…
	https://git.kernel.org/stable/c/e1722acf4f0d4d67b…
	https://git.kernel.org/stable/c/64e491c1634b73d3b…
	https://git.kernel.org/stable/c/00de977f9e0aa9760…

Impacted products

Vendor

Product

Version

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)

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)

Show details on NVD website

JSON

To clipboard

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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.

Action not permitted

GSD-2021-47527

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

Tags

Sightings

Nomenclature