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gsd-2021-47527
Vulnerability from gsd
Aliases
{
"GSD": {
"alias": "CVE-2021-47527",
"id": "GSD-2021-47527",
"references": [
"https://www.suse.com/security/cve/CVE-2021-47527.html"
]
}
}
cve-2021-47527
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2024-12-19 07:44
Severity ?
EPSS score ?
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")).
References
Impacted products
| Vendor | Product | Version | |||||
|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 Version: 761ed4a94582ab291aa24dcbea4e01e8936488c8 |
||||
|
|||||||
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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\"))."
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.