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Echo: linux: security update to 6.1.158-1

high Tenable Cloud Security Plugin ID 459847

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Don't (re)check L1
 intercepts when completing userspace I/O When completing emulation of instruction that generated a
 userspace exit for I/O, don't recheck L1 intercepts as KVM has already finished that phase of instruction
 execution, i.e. has already committed to allowing L2 to perform I/O. If L1 (or host userspace) modifies
 the I/O permission bitmaps during the exit to userspace, KVM will treat the access as being intercepted
 despite already having emulated the I/O access. Pivot on EMULTYPE_NO_DECODE to detect that KVM is
 completing emulation. Of the three users of EMULTYPE_NO_DECODE, only complete_emulated_io() (the intended
 "recipient") can reach the code in question. gp_interception()'s use is mutually exclusive with
 is_guest_mode(), and complete_emulated_insn_gp() unconditionally pairs EMULTYPE_NO_DECODE with
 EMULTYPE_SKIP. The bad behavior was detected by a syzkaller program that toggles port I/O interception
 during the userspace I/O exit, ultimately resulting in a WARN on vcpu->arch.pio.count being non-zero due
 to KVM no completing emulation of the I/O instruction. WARNING: CPU: 23 PID: 1083 at
 arch/x86/kvm/x86.c:8039 emulator_pio_in_out+0x154/0x170 [kvm] Modules linked in: kvm_intel kvm irqbypass
 CPU: 23 UID: 1000 PID: 1083 Comm: repro Not tainted 6.16.0-rc5-c1610d2d66b1-next-vm #74 NONE Hardware
 name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:emulator_pio_in_out+0x154/0x170
 [kvm] PKRU: 55555554 Call Trace: <TASK> kvm_fast_pio+0xd6/0x1d0 [kvm] vmx_handle_exit+0x149/0x610
 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xda8/0x1ac0 [kvm] kvm_vcpu_ioctl+0x244/0x8c0 [kvm]
 __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0x5d/0xc60 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK>
 (CVE-2025-40026)

Solution

Update the linux library and its related packages to version 6.1.158-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-40026

Plugin Details

Severity: High

ID: 459847

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

Percentile: 57.55

CVSS v2

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 4.2

Vector: CVSS2#AV:L/AC:L/Au:S/C:P/I:P/A:C

CVSS Score Source: CVE-2025-40026

CVSS v3

Risk Factor: High

Base Score: 7.9

Temporal Score: 6.9

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/30/2025

Vulnerability Publication Date: 10/23/2025

Reference Information

CVE: CVE-2025-40026