Out-of-bounds Read Affecting kernel-debug package, versions *
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELDEBUG-7109898
- published 10 Jun 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2021-47243 Open this link in a new tabHow to fix?
There is no fixed version for Centos:8 kernel-debug.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
sch_cake: Fix out of bounds when parsing TCP options and header
The TCP option parser in cake qdisc (cake_get_tcpopt and cake_tcph_may_drop) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1.
This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options.").
v2 changes:
Added doff validation in cake_get_tcphdr to avoid parsing garbage as TCP header. Although it wasn't strictly an out-of-bounds access (memory was allocated), garbage values could be read where CAKE expected the TCP header if doff was smaller than 5.
References
- https://access.redhat.com/security/cve/CVE-2021-47243
- https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3f
- https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246
- https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335
- https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7
- https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548