CVE-2024-50094: sfc: Don't invoke xdp_do_flush() from netpoll.
First published: Tue Nov 05 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: sfc: Don't invoke xdp_do_flush() from netpoll. Yury reported a crash in the sfc driver originated from netpoll_send_udp(). The netconsole sends a message and then netpoll invokes the driver's NAPI function with a budget of zero. It is dedicated to allow driver to free TX resources, that it may have used while sending the packet. In the netpoll case the driver invokes xdp_do_flush() unconditionally, leading to crash because bpf_net_context was never assigned. Invoke xdp_do_flush() only if budget is not zero.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.11<6.11.4 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/65d4fc76d75c136744e67754d20feda609e7b793
- https://git.kernel.org/stable/c/55e802468e1d38dec8e25a2fdb6078d45b647e8c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50094
- https://nvd.nist.gov/vuln/detail/CVE-2024-50094
- https://launchpad.net/bugs/cve/CVE-2024-50094
- https://security-tracker.debian.org/tracker/CVE-2024-50094
- https://ubuntu.com/security/CVE-2024-50094
- https://git.kernel.org/linus/55e802468e1d38dec8e25a2fdb6078d45b647e8c
Frequently Asked Questions
What is the severity of CVE-2024-50094?
CVE-2024-50094 has been classified as a moderate severity vulnerability affecting the Linux kernel.
Which versions of the Linux kernel are affected by CVE-2024-50094?
CVE-2024-50094 affects Linux kernel versions between 6.11 and 6.11.4, as well as the 6.12-rc1 and 6.12-rc2 release candidates.
How do I fix CVE-2024-50094?
To resolve CVE-2024-50094, upgrade to a patched version of the Linux kernel that eliminates the vulnerability.
What causes the crash in CVE-2024-50094?
CVE-2024-50094 is caused by a crash in the sfc driver triggered by invoking xdp_do_flush() from netpoll.
Can CVE-2024-50094 be exploited remotely?
CVE-2024-50094 does not involve remote exploitation but can lead to local denial of service through system crashes.
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