SB2026081551 - NULL pointer dereference in Linux kernel crypto ccp driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74403)

CWE-ID: CWE-476 - NULL Pointer Dereference

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.

The vulnerability exists due to improper handling of a NULL pointer in sev_tsm_init_locked in drivers/crypto/ccp/sev-dev.c when initializing SNP TIO under memory pressure. A local user can trigger the affected initialization path and cause a denial of service.

The issue occurs because page_address(NULL) may yield an invalid non-NULL address on architectures without HASHED_PAGE_VIRTUAL, leading to dereference of an invalid pointer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/17e1aae19a06d9f6da4b46d54fa2aeab77ec0c69
• https://git.kernel.org/stable/c/a8d5370eef00eca132a292b1901c9914c817e385