CVE-2024-49864: rxrpc: Fix a race between socket set up and I/O thread creation
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix a race between socket set up and I/O thread creation In rxrpc_open_socket(), it sets up the socket and then sets up the I/O thread that will handle it. This is a problem, however, as there's a gap between the two phases in which a packet may come into rxrpc_encap_rcv() from the UDP packet but we oops when trying to wake the not-yet created I/O thread. As a quick fix, just make rxrpc_encap_rcv() discard the packet if there's no I/O thread yet. A better, but more intrusive fix would perhaps be to rearrange things such that the socket creation is done by the I/O thread.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.2<=6.6.55 | |
| Linux Kernel | >=6.10<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/cdf4bbbdb956d7426f687f38757ebca2a2759a0f
- https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec
- https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2
- https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49864
- https://nvd.nist.gov/vuln/detail/CVE-2024-49864
- https://launchpad.net/bugs/cve/CVE-2024-49864
- https://security-tracker.debian.org/tracker/CVE-2024-49864
- https://ubuntu.com/security/CVE-2024-49864
- https://git.kernel.org/linus/bc212465326e8587325f520a052346f0b57360e6
Frequently Asked Questions
What is the severity of CVE-2024-49864?
CVE-2024-49864 is classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2024-49864?
To fix CVE-2024-49864, upgrade to patched versions of the Linux kernel such as 5.10.223-1 or later.
Which versions of the Linux kernel are affected by CVE-2024-49864?
CVE-2024-49864 affects Linux kernel versions from 6.2 up to 6.6.55, as well as certain 6.10 and 6.11 versions.
Is CVE-2024-49864 exploitable remotely?
CVE-2024-49864 may potentially be exploited remotely due to the socket setup race condition.
What are the potential impacts of CVE-2024-49864?
The impacts of CVE-2024-49864 include the possibility of a denial of service due to improper handling of socket connections.
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