In the Linux kernel, the following vulnerability has been resolved:
ACPI: CPPC: Use access_width over bit_width for system memory accesses
To align with ACPI 6.3+, since bit_width can be any 8-bit value, it cannot be depended on to be always on a clean 8b boundary. This was uncovered on the Cobalt 100 platform.
SError Interrupt on CPU26, code 0xbe000011 -- SError CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION pstate: 62400009 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : cppc_get_perf_caps+0xec/0x410 lr : cppc_get_perf_caps+0xe8/0x410 sp : ffff8000155ab730 x29: ffff8000155ab730 x28: ffff0080139d0038 x27: ffff0080139d0078 x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000 x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff x17: 0000000000000000 x16: ffffdc7e111bad04 x15: ffff00802b251008 x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006 x11: ffffdc7e128f4420 x10: 0000000000000000 x9 : ffffdc7e111badec x8 : ffff00802b251980 x7 : 0000000000000000 x6 : ffff0080139d0028 x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION Call trace: dump_backtrace+0x0/0x1e0 show_stack+0x24/0x30 dump_stack_lvl+0x8c/0xb8 dump_stack+0x18/0x34 panic+0x16c/0x384 add_taint+0x0/0xc0 arm64_serror_panic+0x7c/0x90 arm64_is_fatal_ras_serror+0x34/0xa4 do_serror+0x50/0x6c el1h_64_error_handler+0x40/0x74 el1h_64_error+0x7c/0x80 cppc_get_perf_caps+0xec/0x410 cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq] cpufreq_online+0x2dc/0xa30 cpufreq_add_dev+0xc0/0xd4 subsys_interface_register+0x134/0x14c cpufreq_register_driver+0x1b0/0x354 cppc_cpufreq_init+0x1a8/0x1000 [cppc_cpufreq] do_one_initcall+0x50/0x250 do_init_module+0x60/0x27c load_module+0x2300/0x2570 __do_sys_finit_module+0xa8/0x114 __arm64_sys_finit_module+0x2c/0x3c invoke_syscall+0x78/0x100 el0_svc_common.constprop.0+0x180/0x1a0 do_el0_svc+0x84/0xa0 el0_svc+0x2c/0xc0 el0t_64_sync_handler+0xa4/0x12c el0t_64_sync+0x1a4/0x1a8
Instead, use access_width to determine the size and use the offset and width to shift and mask the bits to read/write out. Make sure to add a check for system memory since pcc redefines the access_width to subspace id.
If access_width is not set, then fall back to using bit_width.
[ rjw: Subject and changelog edits, comment adjustments ]
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-livepatch-5.15.156-102.160Upgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernelUpgrade python-perf-debuginfo | Jul 9, 2024 | May 20, 2024 |
| Amazon_linux_2023 | — | Upgrade kernel-tools-develUpgrade kernel-toolsUpgrade perfUpgrade kernel-livepatch-6.1.90-99.173Upgrade python3-perfUpgrade kernel-debuginfo-common-aarch64Upgrade python3-perf-debuginfoUpgrade kernel-develUpgrade kernel-libbpfUpgrade perf-debuginfoUpgrade kernel-modules-extraUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernel-libbpf-staticUpgrade kernel-libbpf-develUpgrade kernel-modules-extra-commonUpgrade kernel-debuginfo-common-x86_64 | Feb 17, 2025 | May 20, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel | Oct 8, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernelUpgrade python3-perfUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernel-tools | Oct 8, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade bpftool | Oct 9, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel | Oct 8, 2024 | May 20, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Dec 5, 2024 | May 20, 2024 |
| Suse | — | Upgrade dtb-qcomUpgrade gfs2-kmp-defaultUpgrade reiserfs-kmp-azureUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-debug-vdsoUpgrade kernel-debug-livepatch-develUpgrade kernel-default-manUpgrade kernel-defaultUpgrade kernel-rt-livepatch-develUpgrade gfs2-kmp-azureUpgrade kernel-syms-rtUpgrade kernel-docsUpgrade kernel-syms-azureUpgrade dtb-caviumUpgrade kernel-rt-vdsoUpgrade kernel-azureUpgrade dtb-amlogicUpgrade kernel-azure-livepatch-develUpgrade kernel-rt-optionalUpgrade kernel-default-vdsoUpgrade kernel-azure-develUpgrade dlm-kmp-rtUpgrade dtb-armUpgrade dtb-nvidiaUpgrade kernel-kvmsmall-vdsoUpgrade kernel-obs-buildUpgrade kernel-source-vanillaUpgrade kernel-rt_debug-develUpgrade kernel-source-rtUpgrade kernel-64kb-extraUpgrade dtb-sprdUpgrade cluster-md-kmp-64kbUpgrade dtb-alteraUpgrade dtb-rockchipUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debug-vdsoUpgrade kselftests-kmp-azureUpgrade kernel-default-base-rebuildUpgrade kernel-rtUpgrade kernel-azure-vdsoUpgrade kernel-rt-extraUpgrade kselftests-kmp-rtUpgrade reiserfs-kmp-64kbUpgrade kernel-debug-develUpgrade kernel-docs-htmlUpgrade kernel-sourceUpgrade kernel-64kb-optionalUpgrade dtb-freescaleUpgrade kernel-zfcpdumpUpgrade kernel-default-extraUpgrade dtb-broadcomUpgrade dtb-renesasUpgrade dtb-mediatekUpgrade kselftests-kmp-64kbUpgrade kernel-default-optionalUpgrade kernel-64kb-livepatch-develUpgrade dtb-allwinnerUpgrade kernel-azure-extraUpgrade kernel-kvmsmall-develUpgrade kernel-develUpgrade dtb-xilinxUpgrade kernel-azure-optionalUpgrade kernel-default-baseUpgrade kernel-symsUpgrade kernel-kvmsmallUpgrade ocfs2-kmp-64kbUpgrade kernel-default-develUpgrade kernel-rt-develUpgrade kernel-64kbUpgrade dlm-kmp-defaultUpgrade gfs2-kmp-rtUpgrade dtb-amazonUpgrade kernel-azure-baseUpgrade reiserfs-kmp-rtUpgrade kernel-devel-rtUpgrade kernel-64kb-develUpgrade dtb-marvellUpgrade dlm-kmp-64kbUpgrade ocfs2-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-source-azureUpgrade kernel-rt-livepatchUpgrade kernel-obs-qaUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-debugUpgrade dtb-apmUpgrade dtb-amdUpgrade kernel-rt_debugUpgrade kernel-devel-azureUpgrade gfs2-kmp-64kbUpgrade dtb-appleUpgrade dtb-hisiliconUpgrade kernel-default-livepatch-develUpgrade reiserfs-kmp-defaultUpgrade dlm-kmp-azureUpgrade kernel-macrosUpgrade ocfs2-kmp-azureUpgrade cluster-md-kmp-rtUpgrade kernel-default-livepatchUpgrade dtb-exynosUpgrade cluster-md-kmp-defaultUpgrade dtb-socionextUpgrade cluster-md-kmp-azureUpgrade dtb-lg | Jun 24, 2024 | May 20, 2024 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | May 20, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 10, 2025 | May 20, 2024 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub