In the Linux kernel, the following vulnerability has been resolved:
powerpc/pseries: Whitelist dtl slub object for copying to userspace
Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-* results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as shown below.
kernel BUG at mm/usercopy.c:102! Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries Modules linked in: xfs libcrc32c dm_service_time sd_mod t10_pi sg ibmvfc scsi_transport_fc ibmveth pseries_wdt dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse CPU: 27 PID: 1815 Comm: python3 Not tainted 6.10.0-rc3 #85 Hardware name: IBM,9040-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_042) hv:phyp pSeries NIP: c0000000005d23d4 LR: c0000000005d23d0 CTR: 00000000006ee6f8 REGS: c000000120c078c0 TRAP: 0700 Not tainted (6.10.0-rc3) MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 2828220f XER: 0000000e CFAR: c0000000001fdc80 IRQMASK: 0 [ ... GPRs omitted ... ] NIP [c0000000005d23d4] usercopy_abort+0x78/0xb0 LR [c0000000005d23d0] usercopy_abort+0x74/0xb0 Call Trace: usercopy_abort+0x74/0xb0 (unreliable) __check_heap_object+0xf8/0x120 check_heap_object+0x218/0x240 __check_object_size+0x84/0x1a4 dtl_file_read+0x17c/0x2c4 full_proxy_read+0x8c/0x110 vfs_read+0xdc/0x3a0 ksys_read+0x84/0x144 system_call_exception+0x124/0x330 system_call_vectored_common+0x15c/0x2ec --- interrupt: 3000 at 0x7fff81f3ab34
Commit 6d07d1cd300f ("usercopy: Restrict non-usercopy caches to size 0") requires that only whitelisted areas in slab/slub objects can be copied to userspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY. Dtl contains hypervisor dispatch events which are expected to be read by privileged users. Hence mark this safe for user access. Specify useroffset=0 and usersize=DISPATCH_LOG_BYTES to whitelist the entire object.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-tools-libsUpgrade kernel-modulesUpgrade kernel-zfcpdump-develUpgrade kernel-zfcpdump-modulesUpgrade kernel-debug-modulesUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libs-develUpgrade kernelUpgrade kernel-cross-headersUpgrade kernel-zfcpdump-coreUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdumpUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-modules-extraUpgrade kernel-debug-develUpgrade python3-perfUpgrade bpftoolUpgrade kernel-develUpgrade kernel-debugUpgrade kernel-debug-coreUpgrade kernel-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-docUpgrade perf | Sep 26, 2024 | Jul 29, 2024 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Aug 14, 2024 | Jul 29, 2024 |
| Oracle_linux | — | Upgrade kernelUpgrade kernel-uek | Oct 16, 2024 | Jul 29, 2024 |
| Redhat_linux | — | Upgrade kernelUpgrade kernel-rtNo solution exists | Sep 25, 2024 | Jul 29, 2024 |
| Rocky_linux | — | Upgrade kernel-modules-extraUpgrade kernel-modulesUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-cross-headersUpgrade kernel-debug-debuginfoUpgrade perf-debuginfoUpgrade kernel-debug-coreUpgrade python3-perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debugUpgrade kernel-develUpgrade kernel-coreUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-debug-develUpgrade perfUpgrade kernel-tools-libs-develUpgrade kernel-toolsUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-tools-libsUpgrade bpftool-debuginfoUpgrade kernel-debug-modules-extra | May 8, 2025 | Jul 29, 2024 |
| Suse | — | Upgrade kernel-symsUpgrade kselftests-kmp-rtUpgrade dtb-mediatekUpgrade dtb-renesasUpgrade gfs2-kmp-azureUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-rt_debug-livepatch-develUpgrade ocfs2-kmp-64kbUpgrade reiserfs-kmp-rtUpgrade dtb-freescaleUpgrade dtb-marvellUpgrade dtb-caviumUpgrade kernel-default-livepatch-develUpgrade kernel-kvmsmall-develUpgrade reiserfs-kmp-defaultUpgrade kernel-develUpgrade kernel-docs-htmlUpgrade ocfs2-kmp-defaultUpgrade kernel-azure-optionalUpgrade kernel-debug-develUpgrade kernel-default-baseUpgrade kernel-debugUpgrade dtb-amdUpgrade gfs2-kmp-defaultUpgrade dtb-amazonUpgrade gfs2-kmp-rtUpgrade kernel-64kb-livepatch-develUpgrade kernel-64kb-optionalUpgrade kernel-source-azureUpgrade kernel-64kb-extraUpgrade dtb-allwinnerUpgrade kernel-64kb-develUpgrade cluster-md-kmp-rtUpgrade dlm-kmp-azureUpgrade kernel-64kbUpgrade kernel-azure-extraUpgrade dtb-appleUpgrade dtb-lgUpgrade kernel-rt-develUpgrade kernel-default-optionalUpgrade ocfs2-kmp-azureUpgrade ocfs2-kmp-rtUpgrade dtb-apmUpgrade kernel-devel-rtUpgrade kernel-default-livepatchUpgrade kernel-default-develUpgrade gfs2-kmp-64kbUpgrade kernel-docsUpgrade dtb-hisiliconUpgrade dtb-socionextUpgrade kernel-rt_debugUpgrade kernel-obs-qaUpgrade dlm-kmp-defaultUpgrade dtb-xilinxUpgrade kernel-zfcpdumpUpgrade dtb-broadcomUpgrade cluster-md-kmp-azureUpgrade kernel-rt-extraUpgrade kernel-defaultUpgrade kernel-syms-rtUpgrade kernel-debug-livepatch-develUpgrade kselftests-kmp-azureUpgrade cluster-md-kmp-defaultUpgrade dtb-alteraUpgrade reiserfs-kmp-64kbUpgrade kernel-azure-vdsoUpgrade kernel-rt-livepatch-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-base-rebuildUpgrade reiserfs-kmp-azureUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debug-develUpgrade kernel-macrosUpgrade dtb-rockchipUpgrade dtb-nvidiaUpgrade kernel-source-vanillaUpgrade kernel-sourceUpgrade kernel-rt-optionalUpgrade dtb-qcomUpgrade dtb-armUpgrade kernel-devel-azureUpgrade kernel-rtUpgrade kernel-rt-livepatchUpgrade kernel-syms-azureUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade kernel-debug-vdsoUpgrade kernel-obs-buildUpgrade kernel-kvmsmallUpgrade kernel-default-vdsoUpgrade dtb-amlogicUpgrade kernel-default-extraUpgrade cluster-md-kmp-64kbUpgrade dtb-sprdUpgrade dtb-exynosUpgrade kernel-azureUpgrade kselftests-kmp-64kbUpgrade kernel-rt-vdsoUpgrade kernel-azure-livepatch-develUpgrade kernel-rt_debug-vdsoUpgrade kernel-azure-develUpgrade dlm-kmp-64kb | Dec 5, 2025 | Sep 27, 2024 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1072-awsUpgrade linux-image-oem-22.04aUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-ibmUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-ibm-lts-20.04Upgrade linux-image-gkeop-5.4Upgrade linux-image-5.15.0-1078-azureUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1014-ibmUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.4.0-1082-ibmUpgrade linux-image-oemUpgrade linux-image-nvidia-64kUpgrade linux-image-oem-20.04cUpgrade linux-image-gkeopUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-osp1Upgrade linux-image-raspiUpgrade linux-image-6.8.0-1016-azure-fdeUpgrade linux-image-5.15.0-1069-kvmUpgrade linux-image-gkeUpgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-125-lowlatencyUpgrade linux-image-5.15.0-1071-gcpUpgrade linux-image-nvidiaUpgrade linux-image-5.15.0-1065-ibmUpgrade linux-image-lowlatencyUpgrade linux-image-genericUpgrade linux-image-oem-24.04aUpgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-6.8.0-48-lowlatencyUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-48-generic-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-generic-hwe-18.04Upgrade linux-image-6.8.0-1017-gcpUpgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-gcpUpgrade linux-image-5.15.0-125-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-raspi2Upgrade linux-image-oem-20.04bUpgrade linux-image-5.15.0-125-generic-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-22.04Upgrade linux-image-5.15.0-125-generic-lpaeUpgrade linux-image-5.4.0-200-generic-lpaeUpgrade linux-image-5.4.0-200-genericUpgrade linux-image-5.15.0-125-genericUpgrade linux-image-azureUpgrade linux-image-6.8.0-48-lowlatency-64kUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-oem-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-5.15.0-1065-raspiUpgrade linux-image-oem-22.04bUpgrade linux-image-oracle-64kUpgrade linux-image-gke-5.15Upgrade linux-image-5.15.0-1067-nvidia-lowlatencyUpgrade linux-image-oem-20.04dUpgrade linux-image-5.4.0-1135-awsUpgrade linux-image-oem-20.04Upgrade linux-image-intelUpgrade linux-image-6.8.0-1015-oracleUpgrade linux-image-5.15.0-1055-gkeopUpgrade linux-image-5.4.0-1044-iotUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.15.0-1075-azureUpgrade linux-image-6.8.0-1015-oracle-64kUpgrade linux-image-6.8.0-1017-nvidiaUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-generic-64kUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-azure-lts-22.04Upgrade linux-image-6.8.0-1014-raspiUpgrade linux-image-awsUpgrade linux-image-5.15.0-1038-xilinx-zynqmpUpgrade linux-image-bluefieldUpgrade linux-image-gcp-lts-20.04Upgrade linux-image-generic-lpaeUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1017-nvidia-64kUpgrade linux-image-6.8.0-1017-nvidia-lowlatencyUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1017-azureUpgrade linux-image-nvidia-6.8Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-5.4.0-1139-azureUpgrade linux-image-6.8.0-1013-gkeUpgrade linux-image-5.15.0-1069-gkeUpgrade linux-image-6.8.0-1016-azureUpgrade linux-image-aws-lts-22.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-5.4.0-200-lowlatencyUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.4.0-1123-kvmUpgrade linux-image-5.4.0-1119-raspiUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-5.15.0-1070-oracleUpgrade linux-image-5.4.0-1139-gcpUpgrade linux-image-5.4.0-1140-azureUpgrade linux-image-oracleUpgrade linux-image-gkeop-5.15Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-azure-lts-20.04Upgrade linux-image-5.4.0-1134-oracleUpgrade linux-image-6.8.0-1017-azure-fdeUpgrade linux-image-aws-lts-20.04Upgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1016-oemUpgrade linux-image-virtualUpgrade linux-image-virtual-hwe-18.04Upgrade linux-image-6.8.0-1002-gkeopUpgrade linux-image-5.4.0-1094-bluefieldUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-6.8.0-1016-gcpUpgrade linux-image-6.8.0-48-genericUpgrade linux-image-kvmUpgrade linux-image-azure-cvmUpgrade linux-image-5.15.0-1067-intel-iotgUpgrade linux-image-6.8.0-1017-nvidia-lowlatency-64kUpgrade linux-image-5.15.0-1067-nvidiaUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.4.0-1102-gkeopUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-5.4.0-1054-xilinx-zynqmpUpgrade linux-image-6.8.0-1018-aws | Nov 4, 2024 | Jul 29, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2025 | Jul 29, 2024 |
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