CVE-2022-49858

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

octeontx2-pf: Fix SQE threshold checking

Current way of checking available SQE count which is based on HW updated SQB count could result in driver submitting an SQE even before CQE for the previously transmitted SQE at the same index is processed in NAPI resulting losing SKB pointers, hence a leak. Fix this by checking a consumer index which is updated once CQE is processed.

The patch fixes an issue in the octeontx2-pf driver where the SQE (Send Queue Entry) availability check was incorrect. The old method relied on hardware-updated SQB counts and could falsely allow new SQEs to be submitted before the completion (CQE) of prior ones. This race condition could result in reuse of the same SQE index before its associated SKB (socket buffer) is safely released — leading to use-after-free or memory leak (SKB pointer loss).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.