SB20260928307 - Incorrect calculation in Linux kernel io_uring

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-97618)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause incorrect consumption of provided buffer-ring space.

The vulnerability exists due to improper buffer consumption accounting in io_uring recv and recvmsg operations when processing an incoming packet larger than the provided buffer with MSG_TRUNC. A remote attacker can send an oversized packet to cause incorrect consumption of provided buffer-ring space.

Multishot receives already limit consumption according to the available payload size.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2e70ea75c7bb38a6dc212975f887310f14f7c043
• https://git.kernel.org/stable/c/6028b543884f8735e057ec9eea4908cd61cab230
• https://git.kernel.org/stable/c/927d96f91c582b319d104ecf50ec935a8dc29193