cbcvebase.
CVE-2024-55881
published 2025-01-11

CVE-2024-55881: In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Play nice with protected guests in complete_hypercall_exit() Use…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.20%
10.4th percentile
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Play nice with protected guests in complete_hypercall_exit() Use is_64_bit_hypercall() instead of is_64_bit_mode() to detect a 64-bit hypercall when completing said hypercall. For guests with protected state, e.g. SEV-ES and SEV-SNP, KVM must assume the hypercall was made in 64-bit mode as the vCPU state needed to detect 64-bit mode is unavailable. Hacking the sev_smoke_test selftest to generate a KVM_HC_MAP_GPA_RANGE hypercall via VMGEXIT trips the WARN: ------------[ cut here ]------------ WARNING: CPU: 273 PID: 326626 at arch/x86/kvm/x86.h:180 complete_hypercall_exit+0x44/0xe0 [kvm] Modules linked in: kvm_amd kvm ... [last unloaded: kvm] CPU: 273 UID: 0 PID: 326626 Comm: sev_smoke_test Not tainted 6.12.0-smp--392e932fa0f3-feat #470 Hardware name: Google Astoria/astoria, BIOS 0.20240617.0-0 06/17/2024 RIP: 0010:complete_hypercall_exit+0x44/0xe0 [kvm] Call Trace: kvm_arch_vcpu_ioctl_run+0x2400/0x2720 [kvm] kvm_vcpu_ioctl+0x54f/0x630 [kvm] __se_sys_ioctl+0x6b/0xc0 do_syscall_64+0x83/0x160 entry_SYSCALL_64_after_hwframe+0x76/0x7e ---[ end trace 0000000000000000 ]---

Affected

20 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.123-1 (bookworm)linux 6.1.123-1 (bookworm)
debianlinux-6.1< linux 6.1.123-1 (bookworm)linux 6.1.123-1 (bookworm)
linuxlinux
linuxlinux>= 5.15.5 < 5.15.1765.15.176
linuxlinux>= 5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1 < 0840d360a8909c722fb62459f42836afe32ededb0840d360a8909c722fb62459f42836afe32ededb
linuxlinux>= b5aead0064f33ae5e693a364e3204fe1c0ac9af2 < 7ed4db315094963de0678a8adfd43c46471b93497ed4db315094963de0678a8adfd43c46471b9349
linuxlinux>= b5aead0064f33ae5e693a364e3204fe1c0ac9af2 < 3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b63d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6
linuxlinux>= b5aead0064f33ae5e693a364e3204fe1c0ac9af2 < 22b5c2acd65dbe949032f619d4758a35a82fffc322b5c2acd65dbe949032f619d4758a35a82fffc3
linuxlinux>= b5aead0064f33ae5e693a364e3204fe1c0ac9af2 < 9b42d1e8e4fe9dc631162c04caa69b0d1860b0f09b42d1e8e4fe9dc631162c04caa69b0d1860b0f0
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.1.123-16.1.123-1
linuxlinux_kernel>= 0 < 6.12.8-16.12.8-1
linuxlinux_kernel>= 0 < 6.12.8-16.12.8-1
linuxlinux_kernel>= 0 < 5.15.0-135.1465.15.0-135.146
linuxlinux_kernel>= 0 < 6.8.0-60.636.8.0-60.63
linuxlinux_kernel>= 5.15.5 < 5.15.1765.15.176
linuxlinux_kernel>= 5.16.1 < 6.1.1226.1.122
linuxlinux_kernel>= 6.2 < 6.6.686.6.68
linuxlinux_kernel>= 6.7 < 6.12.76.12.7

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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