CVE-2025-37749

An out-of-bounds read vulnerability exists in the ppp_sync_txmunge() function in the Linux kernel's PPP subsystem. Insufficient bounds checking on incoming PPP packets may lead to a kernel crash if a packet with an empty or truncated payload is processed.

This is rated Moderate because it involves an out-of-bounds read, not write, in the ppp_sync_txmunge() function, triggered by malformed PPP packets with insufficient linear data. While it can cause a kernel crash (DoS), exploitation is limited as PPP is not widely used or exposed in most modern systems. The affected path requires a crafted PPPoE packet and direct access to a PPP interface, reducing its overall impact and likelihood of exploitation.

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.

No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.