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 ]
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.15.156-102.160Upgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade python-perfUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-tools | Jul 9, 2024 | May 20, 2024 |
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel-modules-extra-commonUpgrade kernel-libbpf-develUpgrade kernel-debuginfoUpgrade bpftool-debuginfoUpgrade kernelUpgrade kernel-libbpf-staticUpgrade kernel-livepatch-6.1.90-99.173Upgrade python3-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-toolsUpgrade perfUpgrade kernel-libbpfUpgrade python3-perfUpgrade kernel-develUpgrade kernel-modules-extraUpgrade perf-debuginfo | Feb 17, 2025 | May 20, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-toolsUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-tools-libs | Oct 8, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade bpftoolUpgrade python3-perf | Oct 8, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libs | Oct 9, 2024 | May 20, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernelUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-tools | Oct 8, 2024 | May 20, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | Dec 5, 2024 | May 20, 2024 |
| Suse | — | Upgrade reiserfs-kmp-azureUpgrade gfs2-kmp-defaultUpgrade kernel-azure-livepatch-develUpgrade dtb-qcomUpgrade kernel-default-manUpgrade kernel-rt-vdsoUpgrade kernel-syms-rtUpgrade dtb-amlogicUpgrade kernel-syms-azureUpgrade kernel-kvmsmall-vdsoUpgrade kernel-docsUpgrade kernel-debug-vdsoUpgrade dtb-caviumUpgrade kernel-azureUpgrade dtb-nvidiaUpgrade kernel-rt-optionalUpgrade kselftests-kmp-defaultUpgrade reiserfs-kmp-64kbUpgrade kernel-obs-buildUpgrade dlm-kmp-rtUpgrade kselftests-kmp-azureUpgrade dtb-armUpgrade kernel-debug-livepatch-develUpgrade kernel-rt-livepatch-develUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-default-vdsoUpgrade dtb-rockchipUpgrade kselftests-kmp-rtUpgrade kernel-source-rtUpgrade kernel-defaultUpgrade kernel-azure-develUpgrade gfs2-kmp-azureUpgrade dtb-sprdUpgrade kernel-64kb-extraUpgrade kernel-rt_debug-develUpgrade kernel-azure-vdsoUpgrade dtb-alteraUpgrade kernel-rtUpgrade kernel-rt-extraUpgrade kernel-default-base-rebuildUpgrade cluster-md-kmp-64kbUpgrade kernel-rt_debug-vdsoUpgrade kernel-source-vanillaUpgrade dtb-xilinxUpgrade dtb-amdUpgrade kernel-debugUpgrade gfs2-kmp-rtUpgrade dtb-apmUpgrade dtb-amazonUpgrade dlm-kmp-defaultUpgrade kernel-azure-optionalUpgrade ocfs2-kmp-64kbUpgrade kernel-symsUpgrade kernel-rt-develUpgrade kernel-kvmsmallUpgrade kernel-default-develUpgrade kernel-default-baseUpgrade kernel-rt_debugUpgrade kernel-64kbUpgrade dtb-exynosUpgrade cluster-md-kmp-rtUpgrade cluster-md-kmp-defaultUpgrade kernel-default-livepatchUpgrade kernel-64kb-livepatch-develUpgrade dtb-allwinnerUpgrade kernel-kvmsmall-develUpgrade kernel-develUpgrade kernel-azure-extraUpgrade kernel-64kb-develUpgrade ocfs2-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade ocfs2-kmp-azureUpgrade kernel-rt-livepatchUpgrade kernel-obs-qaUpgrade kernel-macrosUpgrade kernel-devel-rtUpgrade kernel-devel-azureUpgrade kernel-default-livepatch-develUpgrade gfs2-kmp-64kbUpgrade dtb-marvellUpgrade dtb-hisiliconUpgrade dtb-appleUpgrade dlm-kmp-azureUpgrade dlm-kmp-64kbUpgrade kernel-source-azureUpgrade kernel-kvmsmall-livepatch-develUpgrade reiserfs-kmp-defaultUpgrade dtb-socionextUpgrade dtb-lgUpgrade dtb-freescaleUpgrade cluster-md-kmp-azureUpgrade kernel-zfcpdumpUpgrade kernel-docs-htmlUpgrade kernel-default-extraUpgrade kernel-debug-develUpgrade kernel-64kb-optionalUpgrade dtb-renesasUpgrade dtb-broadcomUpgrade kselftests-kmp-64kbUpgrade kernel-default-optionalUpgrade dtb-mediatekUpgrade kernel-sourceUpgrade kernel-azure-baseUpgrade reiserfs-kmp-rt | 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 |
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