fkie_cve-2021-47294
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-06-23 20:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().
Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 3.18.134 | |
| linux | linux_kernel | 4.20.7 | |
| linux | linux_kernel | 5.14 | |
| linux | linux_kernel | 5.14 |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: Decrease sock refcount when sock timers expire\n\nCommit 63346650c1a9 (\"netrom: switch to sock timer API\") switched to use\nsock timer API. It replaces mod_timer() by sk_reset_timer(), and\ndel_timer() by sk_stop_timer().\n\nFunction sk_reset_timer() will increase the refcount of sock if it is\ncalled on an inactive timer, hence, in case the timer expires, we need to\ndecrease the refcount ourselves in the handler, otherwise, the sock\nrefcount will be unbalanced and the sock will never be freed."
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}
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"id": "CVE-2021-47294",
"lastModified": "2025-06-23T20:19:04.490",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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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.
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