CVE-2024-56675: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors
First published: Fri Dec 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU protection. But it is possible to attach a non-sleepable BPF program to a uprobe, and non-sleepable BPF programs are freed via normal RCU (see __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal RCU grace period does not imply a tasks-trace-RCU grace period. Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.0<6.1.121 | |
| Linux Kernel | >=6.2<6.6.67 | |
| Linux Kernel | >=6.7<6.12.6 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 | |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/9245459a992d22fe0e92e988f49db1fec82c184a
- https://git.kernel.org/stable/c/f9f85df30118f3f4112761e6682fc60ebcce23e5
- https://git.kernel.org/stable/c/9b53d2c2a38a1effc341d99be3f99fa7ef17047d
- https://git.kernel.org/stable/c/ef1b808e3b7c98612feceedf985c2fbbeb28f956
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56675
- https://nvd.nist.gov/vuln/detail/CVE-2024-56675
- https://launchpad.net/bugs/cve/CVE-2024-56675
- https://security-tracker.debian.org/tracker/CVE-2024-56675
- https://ubuntu.com/security/CVE-2024-56675
- https://git.kernel.org/linus/ef1b808e3b7c98612feceedf985c2fbbeb28f956
Frequently Asked Questions
What is the severity of CVE-2024-56675?
CVE-2024-56675 is considered to have a moderate severity impact due to potential use-after-free vulnerabilities in the Linux kernel.
How do I fix CVE-2024-56675?
To fix CVE-2024-56675, update the Linux kernel to the latest patched version that resolves the vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-56675?
CVE-2024-56675 affects Linux kernel versions from 6.0 up to and including 6.1.121, 6.2 to 6.6.67, and 6.7 up to 6.12.6.
What does CVE-2024-56675 impact in the Linux kernel?
CVE-2024-56675 impacts the BPF (Berkeley Packet Filter) system, specifically related to uprobes and improper attachment of BPF programs.
Is there a workaround for CVE-2024-56675 if I cannot update the kernel?
There are no widely recommended workarounds for CVE-2024-56675, and updating is the best solution to mitigate the vulnerability.
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