SB2026102394 - Integer overflow in Linux kernel can dev driver

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-99066)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service by triggering a kernel panic.

The vulnerability exists due to an integer overflow caused by missing socket buffer header initialization in init_can_skb() when CAN receive buffers reach packet_rcv_spkt() through SOCK_PACKET. A local user can trigger processing of an affected buffer with mac_header set to 0xFFFF to overflow the push length calculation, triggering skb_under_panic and a system-wide kernel panic.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a04c0cb8606ff88399489d03ef255afe90d0d5f
• https://git.kernel.org/stable/c/8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632