Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.4.173, < 4.4.277 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3Patch
- https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060efPatch
- https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8Patch
- https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8aPatch
- https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29Patch
- https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950Patch
- https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cfPatch
- https://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250Patch
- https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3Patch
- https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060efPatch
- https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8Patch
- https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8aPatch
- https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29Patch
- https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950Patch
- https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cfPatch
FAQ
What is CVE-2021-47294?
CVE-2021-47294 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 so...
How severe is CVE-2021-47294?
CVE-2021-47294 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47294?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.