CVE-2024-27414 Affecting kernel-rt-debug-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTDEBUGKVM-6879617
- published 18 May 2024
- disclosed 17 May 2024
Introduced: 17 May 2024
CVE-2024-27414 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt-debug-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back
In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks
IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic
in the function rtnl_bridge_setlink to enable the loop to also check
the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment
removed the break statement and led to an error logic of the flags
writing back at the end of this function.
if (have_flags) memcpy(nla_data(attr), &flags, sizeof(flags)); // attr should point to IFLA_BRIDGE_FLAGS NLA !!!
Before the mentioned commit, the attr is granted to be IFLA_BRIDGE_FLAGS.
However, this is not necessarily true fow now as the updated loop will let
the attr point to the last NLA, even an invalid NLA which could cause
overflow writes.
This patch introduces a new variable br_flag to save the NLA pointer
that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned
error logic.
References
- https://access.redhat.com/security/cve/CVE-2024-27414
- https://git.kernel.org/stable/c/167d8642daa6a44b51de17f8ff0f584e1e762db7
- https://git.kernel.org/stable/c/743ad091fb46e622f1b690385bb15e3cd3daf874
- https://git.kernel.org/stable/c/831bc2728fb48a8957a824cba8c264b30dca1425
- https://git.kernel.org/stable/c/882a51a10ecf24ce135d573afa0872aef02c5125
- https://git.kernel.org/stable/c/a1227b27fcccc99dc44f912b479e01a17e2d7d31
- https://git.kernel.org/stable/c/b9fbc44159dfc3e9a7073032752d9e03f5194a6f
- https://git.kernel.org/stable/c/f2261eb994aa5757c1da046b78e3229a3ece0ad9
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html