In the Linux kernel, the following vulnerability has been resolved:
net/sched: Fix UAF when resolving a clash
KASAN reports the following UAF:
BUG: KASAN: slab-use-after-free in tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct] Read of size 1 at addr ffff888c07603600 by task handler130/6469
Call Trace: <IRQ> dump_stack_lvl+0x48/0x70 print_address_description.constprop.0+0x33/0x3d0 print_report+0xc0/0x2b0 kasan_report+0xd0/0x120 __asan_load1+0x6c/0x80 tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct] tcf_ct_act+0x886/0x1350 [act_ct] tcf_action_exec+0xf8/0x1f0 fl_classify+0x355/0x360 [cls_flower] __tcf_classify+0x1fd/0x330 tcf_classify+0x21c/0x3c0 sch_handle_ingress.constprop.0+0x2c5/0x500 __netif_receive_skb_core.constprop.0+0xb25/0x1510 __netif_receive_skb_list_core+0x220/0x4c0 netif_receive_skb_list_internal+0x446/0x620 napi_complete_done+0x157/0x3d0 gro_cell_poll+0xcf/0x100 __napi_poll+0x65/0x310 net_rx_action+0x30c/0x5c0 __do_softirq+0x14f/0x491 __irq_exit_rcu+0x82/0xc0 irq_exit_rcu+0xe/0x20 common_interrupt+0xa1/0xb0 </IRQ> <TASK> asm_common_interrupt+0x27/0x40
Allocated by task 6469: kasan_save_stack+0x38/0x70 kasan_set_track+0x25/0x40 kasan_save_alloc_info+0x1e/0x40 __kasan_krealloc+0x133/0x190 krealloc+0xaa/0x130 nf_ct_ext_add+0xed/0x230 [nf_conntrack] tcf_ct_act+0x1095/0x1350 [act_ct] tcf_action_exec+0xf8/0x1f0 fl_classify+0x355/0x360 [cls_flower] __tcf_classify+0x1fd/0x330 tcf_classify+0x21c/0x3c0 sch_handle_ingress.constprop.0+0x2c5/0x500 __netif_receive_skb_core.constprop.0+0xb25/0x1510 __netif_receive_skb_list_core+0x220/0x4c0 netif_receive_skb_list_internal+0x446/0x620 napi_complete_done+0x157/0x3d0 gro_cell_poll+0xcf/0x100 __napi_poll+0x65/0x310 net_rx_action+0x30c/0x5c0 __do_softirq+0x14f/0x491
Freed by task 6469: kasan_save_stack+0x38/0x70 kasan_set_track+0x25/0x40 kasan_save_free_info+0x2b/0x60 ____kasan_slab_free+0x180/0x1f0 __kasan_slab_free+0x12/0x30 slab_free_freelist_hook+0xd2/0x1a0 __kmem_cache_free+0x1a2/0x2f0 kfree+0x78/0x120 nf_conntrack_free+0x74/0x130 [nf_conntrack] nf_ct_destroy+0xb2/0x140 [nf_conntrack] __nf_ct_resolve_clash+0x529/0x5d0 [nf_conntrack] nf_ct_resolve_clash+0xf6/0x490 [nf_conntrack] __nf_conntrack_confirm+0x2c6/0x770 [nf_conntrack] tcf_ct_act+0x12ad/0x1350 [act_ct] tcf_action_exec+0xf8/0x1f0 fl_classify+0x355/0x360 [cls_flower] __tcf_classify+0x1fd/0x330 tcf_classify+0x21c/0x3c0 sch_handle_ingress.constprop.0+0x2c5/0x500 __netif_receive_skb_core.constprop.0+0xb25/0x1510 __netif_receive_skb_list_core+0x220/0x4c0 netif_receive_skb_list_internal+0x446/0x620 napi_complete_done+0x157/0x3d0 gro_cell_poll+0xcf/0x100 __napi_poll+0x65/0x310 net_rx_action+0x30c/0x5c0 __do_softirq+0x14f/0x491
The ct may be dropped if a clash has been resolved but is still passed to the tcf_ct_flow_table_process_conn function for further usage. This issue can be fixed by retrieving ct from skb again after confirming conntrack.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade bpftoolUpgrade kernel-64kUpgrade kernel-rt-debug-coreUpgrade kernel-tools-libs-develUpgrade kernelUpgrade kernel-rt-debugUpgrade kernel-64k-devel-matchedUpgrade kernel-rt-kvmUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-zfcpdump-coreUpgrade kernel-cross-headersUpgrade kernel-64k-debug-coreUpgrade kernel-rt-develUpgrade kernel-rt-modules-extraUpgrade kernel-debug-modules-coreUpgrade kernel-64k-debug-develUpgrade kernel-64k-debug-modulesUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-rt-coreUpgrade kernel-tools-libsUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-64k-coreUpgrade kernel-64k-modulesUpgrade python3-perfUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-modules-coreUpgrade kernel-coreUpgrade kernel-abi-stablelistsUpgrade kernel-zfcpdumpUpgrade kernel-debug-devel-matchedUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-modules-extraUpgrade rvUpgrade kernel-debugUpgrade kernel-debug-develUpgrade kernel-rt-modulesUpgrade kernel-rt-modules-coreUpgrade kernel-64k-debugUpgrade perfUpgrade kernel-modulesUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rtUpgrade kernel-toolsUpgrade kernel-rt-debug-modulesUpgrade kernel-64k-modules-extraUpgrade kernel-64k-modules-coreUpgrade kernel-64k-debug-modules-coreUpgrade kernel-docUpgrade kernel-headersUpgrade kernel-modules-extraUpgrade kernel-rt-debug-kvmUpgrade kernel-develUpgrade kernel-64k-develUpgrade rtlaUpgrade kernel-64k-debug-modules-extraUpgrade kernel-uki-virtUpgrade kernel-devel-matchedUpgrade libperfUpgrade kernel-debug-modules-extraUpgrade kernel-debug-uki-virtUpgrade kernel-debug-coreUpgrade kernel-rt-debug-develUpgrade kernel-zfcpdump-develUpgrade kernel-modules-core | Sep 26, 2024 | Jul 29, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Aug 14, 2024 | Jul 29, 2024 |
| Oracle_linux | — | Upgrade kernelUpgrade kernel-uek | Oct 16, 2024 | Jul 29, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Sep 25, 2024 | Jul 29, 2024 |
| Rocky_linux | — | Upgrade kernel-rtUpgrade kernel-tools-libs-develUpgrade kernel-debug-uki-virtUpgrade rvUpgrade kernel-develUpgrade python3-perfUpgrade kernel-coreUpgrade kernel-rt-modulesUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel-rt-debug-modules-extraUpgrade kernel-devel-matchedUpgrade kernel-rt-debugUpgrade perfUpgrade kernel-rt-develUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-debug-coreUpgrade kernel-rt-kvmUpgrade kernel-rt-debug-modules-coreUpgrade kernel-uki-virtUpgrade perf-debuginfoUpgrade kernel-zfcpdumpUpgrade libperfUpgrade kernel-rt-coreUpgrade kernel-rt-debuginfoUpgrade kernel-modulesUpgrade rtlaUpgrade kernel-rt-modules-coreUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-rt-debug-develUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-debug-debuginfoUpgrade kernelUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-cross-headersUpgrade kernel-zfcpdump-coreUpgrade kernel-debug-modulesUpgrade kernel-debug-devel-matchedUpgrade kernel-zfcpdump-modulesUpgrade kernel-modules-coreUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-modules-extraUpgrade kernel-rt-modules-extraUpgrade kernel-debugUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debug-kvmUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade libperf-debuginfoUpgrade kernel-debug-develUpgrade kernel-debug-modules-coreUpgrade kernel-zfcpdump-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-zfcpdump-develUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debug-modules | Sep 17, 2024 | Jul 29, 2024 |
| Suse | — | Upgrade kernel-debug-vdsoUpgrade kernel-docsUpgrade kernel-64kb-extraUpgrade kernel-rt-develUpgrade kernel-rt-extraUpgrade gfs2-kmp-azureUpgrade dlm-kmp-defaultUpgrade kernel-develUpgrade dtb-sprdUpgrade kernel-source-vanillaUpgrade kernel-source-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-default-livepatch-develUpgrade kernel-azureUpgrade dtb-socionextUpgrade dtb-appleUpgrade reiserfs-kmp-defaultUpgrade ocfs2-kmp-azureUpgrade kernel-rt-optionalUpgrade dtb-marvellUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-rt_debugUpgrade kernel-azure-extraUpgrade dtb-caviumUpgrade reiserfs-kmp-rtUpgrade kernel-debugUpgrade kernel-rt_debug-develUpgrade cluster-md-kmp-rtUpgrade gfs2-kmp-defaultUpgrade kernel-debug-develUpgrade dlm-kmp-rtUpgrade dtb-alteraUpgrade dtb-mediatekUpgrade kernel-azure-optionalUpgrade kernel-rt-livepatchUpgrade dtb-nvidiaUpgrade kernel-obs-buildUpgrade dtb-xilinxUpgrade dtb-amdUpgrade kselftests-kmp-azureUpgrade ocfs2-kmp-64kbUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-renesasUpgrade kernel-64kb-optionalUpgrade cluster-md-kmp-64kbUpgrade kselftests-kmp-rtUpgrade reiserfs-kmp-64kbUpgrade kernel-default-optionalUpgrade kernel-devel-rtUpgrade dtb-allwinnerUpgrade kernel-default-baseUpgrade dtb-hisiliconUpgrade kernel-defaultUpgrade kernel-64kb-develUpgrade kernel-debug-livepatch-develUpgrade kernel-obs-qaUpgrade kernel-default-develUpgrade kernel-azure-livepatch-develUpgrade dtb-amazonUpgrade kernel-rt_debug-vdsoUpgrade kernel-default-extraUpgrade kernel-syms-azureUpgrade kernel-64kbUpgrade kernel-zfcpdumpUpgrade gfs2-kmp-rtUpgrade kernel-default-vdsoUpgrade dlm-kmp-64kbUpgrade reiserfs-kmp-azureUpgrade kernel-devel-azureUpgrade dtb-qcomUpgrade dlm-kmp-azureUpgrade kernel-rt-vdsoUpgrade dtb-lgUpgrade kernel-syms-rtUpgrade kernel-64kb-livepatch-develUpgrade kselftests-kmp-defaultUpgrade kernel-docs-htmlUpgrade kernel-rtUpgrade dtb-armUpgrade dtb-apmUpgrade kernel-rt-livepatch-develUpgrade kernel-default-livepatchUpgrade kernel-azure-develUpgrade kselftests-kmp-64kbUpgrade kernel-macrosUpgrade kernel-kvmsmall-vdsoUpgrade dtb-rockchipUpgrade dtb-freescaleUpgrade cluster-md-kmp-defaultUpgrade kernel-sourceUpgrade kernel-symsUpgrade kernel-kvmsmallUpgrade kernel-default-base-rebuildUpgrade ocfs2-kmp-rtUpgrade kernel-azure-vdsoUpgrade gfs2-kmp-64kbUpgrade dtb-exynosUpgrade dtb-broadcomUpgrade dtb-amlogicUpgrade cluster-md-kmp-azureUpgrade kernel-source-azureUpgrade kernel-kvmsmall-devel | Aug 14, 2024 | Jul 29, 2024 |
| Ubuntu | — | Upgrade linux-image-awsUpgrade linux-image-5.15.0-1069-awsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-6.8.0-1015-awsUpgrade linux-image-5.15.0-121-genericUpgrade linux-image-ibm-classicUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-44-generic-64kUpgrade linux-image-6.8.0-1012-ibmUpgrade linux-image-gke-5.15Upgrade linux-image-6.8.0-1013-nvidia-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-oracleUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.15.0-1052-gkeopUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-5.15.0-1066-gkeUpgrade linux-image-5.15.0-1064-intel-iotgUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1012-oracle-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-6.8.0-44-lowlatencyUpgrade linux-image-5.15.0-121-lowlatencyUpgrade linux-image-5.15.0-121-generic-64kUpgrade linux-image-5.15.0-1064-nvidia-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1012-oracleUpgrade linux-image-5.15.0-1068-gcpUpgrade linux-image-6.8.0-1011-raspiUpgrade linux-image-azure-cvmUpgrade linux-image-5.15.0-1067-oracleUpgrade linux-image-6.8.0-1010-gkeUpgrade linux-image-ibmUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-5.15.0-1062-ibmUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-6.8.0-1014-azureUpgrade linux-image-generic-lpaeUpgrade linux-image-5.15.0-1035-xilinx-zynqmpUpgrade linux-image-6.8.0-1013-nvidia-lowlatencyUpgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-oem-20.04Upgrade linux-image-oem-20.04bUpgrade linux-image-5.15.0-1064-nvidiaUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-44-genericUpgrade linux-image-gkeopUpgrade linux-image-nvidia-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-44-lowlatency-64kUpgrade linux-image-5.15.0-1066-kvmUpgrade linux-image-azureUpgrade linux-image-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-5.15.0-1072-azure-fdeUpgrade linux-image-6.8.0-1012-oemUpgrade linux-image-intelUpgrade linux-image-oem-20.04dUpgrade linux-image-6.8.0-1013-nvidiaUpgrade linux-image-oem-20.04cUpgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1072-azureUpgrade linux-image-5.15.0-121-lowlatency-64kUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1013-nvidia-64kUpgrade linux-image-kvmUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-1014-azure-fdeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-5.15.0-121-generic-lpaeUpgrade linux-image-azure-lts-22.04Upgrade linux-image-6.8.0-1014-gcpUpgrade linux-image-genericUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-gcpUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.15.0-1062-raspiUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-nvidia | Sep 12, 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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