CVE-2024-41009

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix overrunning reservations in ringbuf

The BPF ring buffer internally is implemented as a power-of-2 sized circular

buffer, with two logical and ever-increasing counters: consumer_pos is the

consumer counter to show which logical position the consumer consumed the

data, and producer_pos which is the producer counter denoting the amount of

data reserved by all producers.

Each time a record is reserved, the producer that "owns" the record will

successfully advance producer counter. In user space each time a record is

read, the consumer of the data advanced the consumer counter once it finished

processing. Both counters are stored in separate pages so that from user

space, the producer counter is read-only and the consumer counter is read-write.

One aspect that simplifies and thus speeds up the implementation of both

producers and consumers is how the data area is mapped twice contiguously

back-to-back in the vi

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References