Out-of-bounds write in Linux kernel - CVE-2026-98158
Published: September 28, 2026
Vulnerability identifier: #VU152283
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98158
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of skb headroom in ppp_async's process_input_packet() when processing a bad-FCS PPP frame followed by a crafted frame. A remote attacker can send malformed PPP frames to cause a denial of service.
When CCP compression is enabled, decompression can read before the skb head.
Affected software
Linux kernel
How to mitigate CVE-2026-98158
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3