CVE-2021-47294
netrom: Decrease sock refcount when sock timers expire
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netrom: Disminuir el recuento de sock cuando caducan los temporizadores de sock. La confirmación 63346650c1a9 ("netrom: cambiar a API de temporizador de sock") cambió para usar la API de temporizador de sock. Reemplaza mod_timer() por sk_reset_timer() y del_timer() por sk_stop_timer(). La función sk_reset_timer() aumentará el recuento del sock si se llama en un temporizador inactivo, por lo tanto, en caso de que el temporizador expire, debemos disminuir el recuento nosotros mismos en el controlador; de lo contrario, el recuento del calcetín se desequilibrará y el sock nunca será liberado.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-21 CVE Reserved
- 2024-05-21 CVE Published
- 2024-05-22 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (15)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/ce29e8a259de767f7210d346ad2b031cb8ab2732 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f | Vuln. Introduced | |
| https://git.kernel.org/stable/c/0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb | Vuln. Introduced | |
| https://git.kernel.org/stable/c/2c6b572458a9127e8070df13fa7f115c29ab1d92 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/63346650c1a94a92be61a57416ac88c0a47c4327 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/f1d9a1f2ef6ff17293d21d5e6b80e04bea0cf508 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/519e8a22a454b1f1baa3a151b184fe51bc18e178 | Vuln. Introduced |
| URL | Date | SRC |
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| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.4.173 < 4.4.277 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.173 < 4.4.277" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.9.155 < 4.9.277 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.155 < 4.9.277" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14.98 < 4.14.241 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.98 < 4.14.241" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19.20 < 4.19.199 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.20 < 4.19.199" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.0 < 5.4.136 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.4.136" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.0 < 5.10.54 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.10.54" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.0 < 5.13.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.13.6" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.0 < 5.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.14" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 3.18.134 Search vendor "Linux" for product "Linux Kernel" and version "3.18.134" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.20.7 Search vendor "Linux" for product "Linux Kernel" and version "4.20.7" | en |
Affected
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