Ubuntu: (Multiple Advisories) (CVE-2024-42240): Linux kernel vulnerabilities

Ubuntu: (Multiple Advisories) (CVE-2024-42240): Linux kernel vulnerabilities

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

08/07/2024

Created

09/17/2024

Added

09/16/2024

Modified

01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: x86/bhi: Avoid warning in #DB handler due to BHI mitigation When BHI mitigation is enabled, if SYSENTER is invoked with the TF flag set then entry_SYSENTER_compat() uses CLEAR_BRANCH_HISTORY and calls the clear_bhb_loop() before the TF flag is cleared. This causes the #DB handler (exc_debug_kernel()) to issue a warning because single-step is used outside the entry_SYSENTER_compat() function. To address this issue, entry_SYSENTER_compat() should use CLEAR_BRANCH_HISTORY after making sure the TF flag is cleared. The problem can be reproduced with the following sequence: $ cat sysenter_step.c int main() { asm("pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter"); } $ gcc -o sysenter_step sysenter_step.c $ ./sysenter_step Segmentation fault (core dumped) The program is expected to crash, and the #DB handler will issue a warning. Kernel log: WARNING: CPU: 27 PID: 7000 at arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160 ... RIP: 0010:exc_debug_kernel+0xd2/0x160 ... Call Trace: <#DB> ? show_regs+0x68/0x80 ? __warn+0x8c/0x140 ? exc_debug_kernel+0xd2/0x160 ? report_bug+0x175/0x1a0 ? handle_bug+0x44/0x90 ? exc_invalid_op+0x1c/0x70 ? asm_exc_invalid_op+0x1f/0x30 ? exc_debug_kernel+0xd2/0x160 exc_debug+0x43/0x50 asm_exc_debug+0x1e/0x40 RIP: 0010:clear_bhb_loop+0x0/0xb0 ... </#DB> <TASK> ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d </TASK> [ bp: Massage commit message. ]

Solution(s)

• ubuntu-upgrade-linux-image-4-15-0-1137-oracle
• ubuntu-upgrade-linux-image-4-15-0-1158-kvm
• ubuntu-upgrade-linux-image-4-15-0-1168-gcp
• ubuntu-upgrade-linux-image-4-15-0-1175-aws
• ubuntu-upgrade-linux-image-4-15-0-1183-azure
• ubuntu-upgrade-linux-image-4-15-0-231-generic
• ubuntu-upgrade-linux-image-4-15-0-231-lowlatency
• ubuntu-upgrade-linux-image-4-4-0-1138-aws
• ubuntu-upgrade-linux-image-4-4-0-1139-kvm
• ubuntu-upgrade-linux-image-4-4-0-1176-aws
• ubuntu-upgrade-linux-image-4-4-0-261-generic
• ubuntu-upgrade-linux-image-4-4-0-261-lowlatency
• ubuntu-upgrade-linux-image-5-15-0-1035-xilinx-zynqmp
• ubuntu-upgrade-linux-image-5-15-0-1052-gkeop
• ubuntu-upgrade-linux-image-5-15-0-1062-ibm
• ubuntu-upgrade-linux-image-5-15-0-1062-raspi
• ubuntu-upgrade-linux-image-5-15-0-1064-intel-iotg
• ubuntu-upgrade-linux-image-5-15-0-1064-nvidia
• ubuntu-upgrade-linux-image-5-15-0-1064-nvidia-lowlatency
• ubuntu-upgrade-linux-image-5-15-0-1066-gke
• ubuntu-upgrade-linux-image-5-15-0-1066-kvm
• ubuntu-upgrade-linux-image-5-15-0-1067-oracle
• ubuntu-upgrade-linux-image-5-15-0-1068-gcp
• ubuntu-upgrade-linux-image-5-15-0-1069-aws
• ubuntu-upgrade-linux-image-5-15-0-1072-azure
• ubuntu-upgrade-linux-image-5-15-0-1072-azure-fde
• ubuntu-upgrade-linux-image-5-15-0-121-generic
• ubuntu-upgrade-linux-image-5-15-0-121-generic-64k
• ubuntu-upgrade-linux-image-5-15-0-121-generic-lpae
• ubuntu-upgrade-linux-image-5-15-0-121-lowlatency
• ubuntu-upgrade-linux-image-5-15-0-121-lowlatency-64k
• ubuntu-upgrade-linux-image-5-4-0-1045-iot
• ubuntu-upgrade-linux-image-5-4-0-1055-xilinx-zynqmp
• ubuntu-upgrade-linux-image-5-4-0-1083-ibm
• ubuntu-upgrade-linux-image-5-4-0-1096-bluefield
• ubuntu-upgrade-linux-image-5-4-0-1120-raspi
• ubuntu-upgrade-linux-image-5-4-0-1124-kvm
• ubuntu-upgrade-linux-image-5-4-0-1135-oracle
• ubuntu-upgrade-linux-image-5-4-0-1136-aws
• ubuntu-upgrade-linux-image-5-4-0-1140-gcp
• ubuntu-upgrade-linux-image-5-4-0-1142-azure
• ubuntu-upgrade-linux-image-5-4-0-202-generic
• ubuntu-upgrade-linux-image-5-4-0-202-generic-lpae
• ubuntu-upgrade-linux-image-5-4-0-202-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-1002-gkeop
• ubuntu-upgrade-linux-image-6-8-0-1013-gke
• ubuntu-upgrade-linux-image-6-8-0-1014-ibm
• ubuntu-upgrade-linux-image-6-8-0-1014-raspi
• ubuntu-upgrade-linux-image-6-8-0-1015-oracle
• ubuntu-upgrade-linux-image-6-8-0-1015-oracle-64k
• ubuntu-upgrade-linux-image-6-8-0-1016-azure
• ubuntu-upgrade-linux-image-6-8-0-1016-azure-fde
• ubuntu-upgrade-linux-image-6-8-0-1016-gcp
• ubuntu-upgrade-linux-image-6-8-0-1016-oem
• ubuntu-upgrade-linux-image-6-8-0-1017-azure
• ubuntu-upgrade-linux-image-6-8-0-1017-azure-fde
• ubuntu-upgrade-linux-image-6-8-0-1017-gcp
• ubuntu-upgrade-linux-image-6-8-0-1017-nvidia
• ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-64k
• ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-1017-nvidia-lowlatency-64k
• ubuntu-upgrade-linux-image-6-8-0-1018-aws
• ubuntu-upgrade-linux-image-6-8-0-48-generic
• ubuntu-upgrade-linux-image-6-8-0-48-generic-64k
• ubuntu-upgrade-linux-image-6-8-0-48-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-48-lowlatency-64k
• ubuntu-upgrade-linux-image-aws
• ubuntu-upgrade-linux-image-aws-hwe
• ubuntu-upgrade-linux-image-aws-lts-18-04
• ubuntu-upgrade-linux-image-aws-lts-20-04
• ubuntu-upgrade-linux-image-aws-lts-22-04
• ubuntu-upgrade-linux-image-azure
• ubuntu-upgrade-linux-image-azure-cvm
• ubuntu-upgrade-linux-image-azure-fde
• ubuntu-upgrade-linux-image-azure-fde-lts-22-04
• ubuntu-upgrade-linux-image-azure-lts-18-04
• ubuntu-upgrade-linux-image-azure-lts-20-04
• ubuntu-upgrade-linux-image-azure-lts-22-04
• ubuntu-upgrade-linux-image-bluefield
• ubuntu-upgrade-linux-image-gcp
• ubuntu-upgrade-linux-image-gcp-lts-18-04
• ubuntu-upgrade-linux-image-gcp-lts-20-04
• ubuntu-upgrade-linux-image-gcp-lts-22-04
• ubuntu-upgrade-linux-image-generic
• ubuntu-upgrade-linux-image-generic-64k
• ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
• ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
• ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
• ubuntu-upgrade-linux-image-generic-hwe-16-04
• ubuntu-upgrade-linux-image-generic-hwe-18-04
• ubuntu-upgrade-linux-image-generic-hwe-20-04
• ubuntu-upgrade-linux-image-generic-hwe-22-04
• ubuntu-upgrade-linux-image-generic-hwe-24-04
• ubuntu-upgrade-linux-image-generic-lpae
• ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
• ubuntu-upgrade-linux-image-generic-lts-xenial
• ubuntu-upgrade-linux-image-gke
• ubuntu-upgrade-linux-image-gke-5-15
• ubuntu-upgrade-linux-image-gkeop
• ubuntu-upgrade-linux-image-gkeop-5-15
• ubuntu-upgrade-linux-image-gkeop-6-8
• ubuntu-upgrade-linux-image-ibm
• ubuntu-upgrade-linux-image-ibm-classic
• ubuntu-upgrade-linux-image-ibm-lts-20-04
• ubuntu-upgrade-linux-image-ibm-lts-24-04
• ubuntu-upgrade-linux-image-intel
• ubuntu-upgrade-linux-image-intel-iotg
• ubuntu-upgrade-linux-image-kvm
• ubuntu-upgrade-linux-image-lowlatency
• ubuntu-upgrade-linux-image-lowlatency-64k
• ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
• ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
• ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-16-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-24-04
• ubuntu-upgrade-linux-image-lowlatency-lts-xenial
• ubuntu-upgrade-linux-image-nvidia
• ubuntu-upgrade-linux-image-nvidia-6-8
• ubuntu-upgrade-linux-image-nvidia-64k
• ubuntu-upgrade-linux-image-nvidia-64k-6-8
• ubuntu-upgrade-linux-image-nvidia-64k-hwe-22-04
• ubuntu-upgrade-linux-image-nvidia-hwe-22-04
• ubuntu-upgrade-linux-image-nvidia-lowlatency
• ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
• ubuntu-upgrade-linux-image-oem
• ubuntu-upgrade-linux-image-oem-20-04
• ubuntu-upgrade-linux-image-oem-20-04b
• ubuntu-upgrade-linux-image-oem-20-04c
• ubuntu-upgrade-linux-image-oem-20-04d
• ubuntu-upgrade-linux-image-oem-22-04
• ubuntu-upgrade-linux-image-oem-22-04a
• ubuntu-upgrade-linux-image-oem-22-04b
• ubuntu-upgrade-linux-image-oem-22-04c
• ubuntu-upgrade-linux-image-oem-22-04d
• ubuntu-upgrade-linux-image-oem-24-04
• ubuntu-upgrade-linux-image-oem-24-04a
• ubuntu-upgrade-linux-image-oem-osp1
• ubuntu-upgrade-linux-image-oracle
• ubuntu-upgrade-linux-image-oracle-64k
• ubuntu-upgrade-linux-image-oracle-lts-18-04
• ubuntu-upgrade-linux-image-oracle-lts-20-04
• ubuntu-upgrade-linux-image-oracle-lts-22-04
• ubuntu-upgrade-linux-image-raspi
• ubuntu-upgrade-linux-image-raspi-hwe-18-04
• ubuntu-upgrade-linux-image-raspi-nolpae
• ubuntu-upgrade-linux-image-raspi2
• ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
• ubuntu-upgrade-linux-image-virtual
• ubuntu-upgrade-linux-image-virtual-hwe-16-04
• ubuntu-upgrade-linux-image-virtual-hwe-18-04
• ubuntu-upgrade-linux-image-virtual-hwe-20-04
• ubuntu-upgrade-linux-image-virtual-hwe-22-04
• ubuntu-upgrade-linux-image-virtual-hwe-24-04
• ubuntu-upgrade-linux-image-virtual-lts-xenial
• ubuntu-upgrade-linux-image-xilinx-zynqmp

References

• https://attackerkb.com/topics/cve-2024-42240
• CVE - 2024-42240
• USN-7007-1
• USN-7007-2
• USN-7007-3
• USN-7009-1
• USN-7009-2
• USN-7019-1
• USN-7089-1
• USN-7089-2
• USN-7089-3
• USN-7089-4
• USN-7089-5
• USN-7089-6
• USN-7089-7
• USN-7090-1
• USN-7095-1
• USN-7121-1
• USN-7121-2
• USN-7121-3
• USN-7148-1
• USN-7156-1
• USN-7159-1
• USN-7159-2
• USN-7159-3
• USN-7159-4
• USN-7159-5
• USN-7195-1
• USN-7195-2

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