CVE-2024-50139: KVM: arm64: Fix shift-out-of-bounds bug
First published: Thu Nov 07 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix shift-out-of-bounds bug Fix a shift-out-of-bounds bug reported by UBSAN when running VM with MTE enabled host kernel. UBSAN: shift-out-of-bounds in arch/arm64/kvm/sys_regs.c:1988:14 shift exponent 33 is too large for 32-bit type 'int' CPU: 26 UID: 0 PID: 7629 Comm: qemu-kvm Not tainted 6.12.0-rc2 #34 Hardware name: IEI NF5280R7/Mitchell MB, BIOS 00.00. 2024-10-12 09:28:54 10/14/2024 Call trace: dump_backtrace+0xa0/0x128 show_stack+0x20/0x38 dump_stack_lvl+0x74/0x90 dump_stack+0x18/0x28 __ubsan_handle_shift_out_of_bounds+0xf8/0x1e0 reset_clidr+0x10c/0x1c8 kvm_reset_sys_regs+0x50/0x1c8 kvm_reset_vcpu+0xec/0x2b0 __kvm_vcpu_set_target+0x84/0x158 kvm_vcpu_set_target+0x138/0x168 kvm_arch_vcpu_ioctl_vcpu_init+0x40/0x2b0 kvm_arch_vcpu_ioctl+0x28c/0x4b8 kvm_vcpu_ioctl+0x4bc/0x7a8 __arm64_sys_ioctl+0xb4/0x100 invoke_syscall+0x70/0x100 el0_svc_common.constprop.0+0x48/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x3c/0x158 el0t_64_sync_handler+0x120/0x130 el0t_64_sync+0x194/0x198
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.3<6.6.59 | |
| Linux Kernel | >=6.7<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 |
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Reference Links
- https://git.kernel.org/stable/c/04ed2ba07ce73f323052475fbd33d647aca3ff2e
- https://git.kernel.org/stable/c/4b9e11794d910aa55300debbac5f0adcc42c491a
- https://git.kernel.org/stable/c/c6c167afa090ea0451f91814e1318755a8fb8bb9
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50139
- https://nvd.nist.gov/vuln/detail/CVE-2024-50139
- https://launchpad.net/bugs/cve/CVE-2024-50139
- https://security-tracker.debian.org/tracker/CVE-2024-50139
- https://ubuntu.com/security/CVE-2024-50139
Frequently Asked Questions
What is the severity of CVE-2024-50139?
The severity of CVE-2024-50139 is considered medium due to its potential impact on system stability.
How do I fix CVE-2024-50139?
To fix CVE-2024-50139, update the Linux kernel to the latest stable version that addresses the vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-50139?
CVE-2024-50139 affects Linux kernel versions between 6.3 and 6.6.59, as well as versions 6.7 to 6.11.6, and the 6.12 release candidates.
Is there a workaround for CVE-2024-50139?
Currently, the recommended approach is to update the Linux kernel since no specific workaround is documented for this vulnerability.
What are the implications of CVE-2024-50139 on KVM hosts?
CVE-2024-50139 can lead to potential instability in KVM hosts running with MTE enabled, requiring immediate attention for mitigation.
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