CVE-2021-47295: net: sched: fix memory leak in tcindex_partial_destroy_work
First published: Tue May 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| Linux Kernel | >=3.18<5.4.136 | |
| Linux Kernel | >=5.5<5.10.54 | |
| Linux Kernel | >=5.11<5.13.6 | |
| Linux Kernel | =5.14-rc1 | |
| Linux Kernel | =5.14-rc2 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47295?
CVE-2021-47295 is classified as a medium severity vulnerability due to the memory leak it introduces in the Linux kernel.
How do I fix CVE-2021-47295?
To fix CVE-2021-47295, you should upgrade the Linux kernel to the latest patched version that includes the fix for this vulnerability.
What are the affected Linux kernel versions for CVE-2021-47295?
CVE-2021-47295 affects various Linux kernel versions from 3.18 to 5.14-rc2, as well as versions within specific ranges such as 5.4.136 to 5.10.54 and 5.11 to 5.13.6.
What type of vulnerability is CVE-2021-47295?
CVE-2021-47295 is a memory leak vulnerability identified in the tcindex_set_parms() function of the Linux kernel.
Who reported CVE-2021-47295?
CVE-2021-47295 was reported by the Syzbot automated testing tool.
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