In the Linux kernel, the following vulnerability has been resolved:
netns: Make get_net_ns() handle zero refcount net
Syzkaller hit a warning: refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 7890 at lib/refcount.c:25 refcount_warn_saturate+0xdf/0x1d0 Modules linked in: CPU: 3 PID: 7890 Comm: tun Not tainted 6.10.0-rc3-00100-gcaa4f9578aba-dirty #310 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:refcount_warn_saturate+0xdf/0x1d0 Code: 41 49 04 31 ff 89 de e8 9f 1e cd fe 84 db 75 9c e8 76 26 cd fe c6 05 b6 41 49 04 01 90 48 c7 c7 b8 8e 25 86 e8 d2 05 b5 fe 90 <0f> 0b 90 90 e9 79 ff ff ff e8 53 26 cd fe 0f b6 1 RSP: 0018:ffff8881067b7da0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff811c72ac RDX: ffff8881026a2140 RSI: ffffffff811c72b5 RDI: 0000000000000001 RBP: ffff8881067b7db0 R08: 0000000000000000 R09: 205b5d3730353139 R10: 0000000000000000 R11: 205d303938375420 R12: ffff8881086500c4 R13: ffff8881086500c4 R14: ffff8881086500b0 R15: ffff888108650040 FS: 00007f5b2961a4c0(0000) GS:ffff88823bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d7ed36fd18 CR3: 00000001482f6000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ? show_regs+0xa3/0xc0 ? __warn+0xa5/0x1c0 ? refcount_warn_saturate+0xdf/0x1d0 ? report_bug+0x1fc/0x2d0 ? refcount_warn_saturate+0xdf/0x1d0 ? handle_bug+0xa1/0x110 ? exc_invalid_op+0x3c/0xb0 ? asm_exc_invalid_op+0x1f/0x30 ? __warn_printk+0xcc/0x140 ? __warn_printk+0xd5/0x140 ? refcount_warn_saturate+0xdf/0x1d0 get_net_ns+0xa4/0xc0 ? __pfx_get_net_ns+0x10/0x10 open_related_ns+0x5a/0x130 __tun_chr_ioctl+0x1616/0x2370 ? __sanitizer_cov_trace_switch+0x58/0xa0 ? __sanitizer_cov_trace_const_cmp2+0x1c/0x30 ? __pfx_tun_chr_ioctl+0x10/0x10 tun_chr_ioctl+0x2f/0x40 __x64_sys_ioctl+0x11b/0x160 x64_sys_call+0x1211/0x20d0 do_syscall_64+0x9e/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5b28f165d7 Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 8 RSP: 002b:00007ffc2b59c5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b28f165d7 RDX: 0000000000000000 RSI: 00000000000054e3 RDI: 0000000000000003 RBP: 00007ffc2b59c650 R08: 00007f5b291ed8c0 R09: 00007f5b2961a4c0 R10: 0000000029690010 R11: 0000000000000246 R12: 0000000000400730 R13: 00007ffc2b59cf40 R14: 0000000000000000 R15: 0000000000000000 </TASK> Kernel panic - not syncing: kernel: panic_on_warn set ...
This is trigger as below: ns0 ns1 tun_set_iff() //dev is tun0 tun->dev = dev //ip link set tun0 netns ns1 put_net() //ref is 0 __tun_chr_ioctl() //TUNGETDEVNETNS net = dev_net(tun->dev); open_related_ns(&net->ns, get_net_ns); //ns1 get_net_ns() get_net() //addition on 0
Use maybe_get_net() in get_net_ns in case net's ref is zero to fix this
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-debug-coreUpgrade kernel-modulesUpgrade kernel-rt-debug-develUpgrade perfUpgrade python3-perfUpgrade kernel-devel-matchedUpgrade kernel-docUpgrade kernel-rtUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-debug-modules-coreUpgrade kernel-rt-debugUpgrade kernel-rt-coreUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-debug-uki-virtUpgrade kernel-rt-develUpgrade kernel-64k-debug-modules-coreUpgrade libperfUpgrade kernel-64k-debug-modulesUpgrade kernel-zfcpdumpUpgrade kernel-rt-modulesUpgrade kernel-uki-virtUpgrade kernel-64k-modules-extraUpgrade kernel-64k-debug-develUpgrade kernel-rt-debug-modules-extraUpgrade kernel-zfcpdump-devel-matchedUpgrade rvUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-develUpgrade kernel-coreUpgrade kernel-modules-extraUpgrade kernel-toolsUpgrade kernel-64k-develUpgrade kernel-debug-modules-coreUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdump-develUpgrade kernel-debugUpgrade kernel-modules-coreUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-rt-modules-extraUpgrade kernel-abi-stablelistsUpgrade kernel-64k-modules-coreUpgrade kernel-zfcpdump-modulesUpgrade kernel-debug-develUpgrade kernel-rt-debug-kvmUpgrade kernel-rt-debug-modulesUpgrade kernel-64k-coreUpgrade kernel-debug-modulesUpgrade kernel-64k-modulesUpgrade kernel-rt-modules-coreUpgrade kernel-64k-debugUpgrade kernel-64k-devel-matchedUpgrade rtlaUpgrade kernel-debug-devel-matchedUpgrade kernel-tools-libs-develUpgrade kernel-cross-headersUpgrade kernel-headersUpgrade kernel-rt-kvmUpgrade bpftoolUpgrade kernel-64kUpgrade kernel-64k-debug-core | Sep 26, 2024 | Jul 12, 2024 |
| Amazon Linux Ami 2 | — | Upgrade perfUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-livepatch-5.15.162-107.160Upgrade kernelUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-livepatch-5.10.223-211.872Upgrade kernel-headersUpgrade bpftool-debuginfo | Mar 4, 2025 | Jul 12, 2024 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpf-staticUpgrade kernel-headersUpgrade kernel-libbpf-develUpgrade kernelUpgrade kernel-modules-extraUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-libbpfUpgrade kernel-toolsUpgrade python3-perf-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel-livepatch-6.1.96-102.177Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-develUpgrade python3-perfUpgrade perf-debuginfoUpgrade perf | Mar 27, 2025 | Jul 12, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 17, 2024 | Jul 12, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perf | Dec 12, 2024 | Jul 12, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel | Dec 12, 2024 | Jul 12, 2024 |
| Oracle_linux | — | Upgrade kernelUpgrade kernel-uek | Oct 16, 2024 | Jul 12, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Sep 25, 2024 | Jul 12, 2024 |
| Rocky_linux | — | Upgrade kernel-debug-modules-coreUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-coreUpgrade kernel-rt-debugUpgrade perf-debuginfoUpgrade kernel-cross-headersUpgrade kernel-headersUpgrade kernel-modules-extraUpgrade kernel-debugUpgrade kernel-uki-virtUpgrade kernel-zfcpdumpUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-zfcpdump-modules-extraUpgrade kernel-debug-develUpgrade kernel-devel-matchedUpgrade kernel-rt-debug-develUpgrade libperfUpgrade python3-perfUpgrade rtlaUpgrade kernel-debug-debuginfoUpgrade kernel-debug-uki-virtUpgrade kernel-rt-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-debug-kvmUpgrade kernel-zfcpdump-develUpgrade kernelUpgrade kernel-rt-debug-modules-extraUpgrade kernel-develUpgrade kernel-modulesUpgrade kernel-modules-coreUpgrade kernel-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-debug-coreUpgrade kernel-tools-debuginfoUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-debug-modules-extraUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-modulesUpgrade kernel-rt-modules-coreUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debuginfoUpgrade libperf-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-devel-matchedUpgrade kernel-toolsUpgrade kernel-debug-modulesUpgrade bpftool-debuginfoUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-modules-extraUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-rt-kvmUpgrade kernel-zfcpdump-modulesUpgrade kernel-tools-libs-develUpgrade kernel-rt-develUpgrade kernel-rtUpgrade rvUpgrade perf | Aug 22, 2024 | Jul 12, 2024 |
| Suse | — | Upgrade kernel-azure-livepatch-develUpgrade kernel-64kb-extraUpgrade kernel-debug-vdsoUpgrade kselftests-kmp-azureUpgrade cluster-md-kmp-defaultUpgrade kernel-defaultUpgrade kernel-rt-extraUpgrade cluster-md-kmp-64kbUpgrade kernel-rt-livepatch-develUpgrade kernel-rt_debug-develUpgrade dtb-exynosUpgrade dtb-qcomUpgrade kernel-kvmsmall-vdsoUpgrade kernel-syms-rtUpgrade kselftests-kmp-64kbUpgrade kernel-source-rtUpgrade kernel-sourceUpgrade gfs2-kmp-defaultUpgrade kernel-syms-azureUpgrade dtb-rockchipUpgrade kernel-docs-htmlUpgrade kernel-source-vanillaUpgrade kernel-rt-optionalUpgrade kernel-rt_debug-vdsoUpgrade kernel-azureUpgrade kernel-default-livepatchUpgrade ocfs2-kmp-64kbUpgrade kernel-default-vdsoUpgrade dtb-nvidiaUpgrade kernel-azure-optionalUpgrade dlm-kmp-rtUpgrade dtb-alteraUpgrade kernel-kvmsmallUpgrade kernel-azure-vdsoUpgrade kernel-default-base-rebuildUpgrade kernel-docsUpgrade dtb-amlogicUpgrade reiserfs-kmp-azureUpgrade kernel-devel-azureUpgrade kernel-rt_debugUpgrade kernel-rtUpgrade kernel-rt-vdsoUpgrade kernel-obs-buildUpgrade dtb-marvellUpgrade dtb-xilinxUpgrade cluster-md-kmp-rtUpgrade dtb-sprdUpgrade kernel-macrosUpgrade dtb-mediatekUpgrade dtb-freescaleUpgrade kselftests-kmp-rtUpgrade kernel-rt-livepatchUpgrade kernel-obs-qaUpgrade dlm-kmp-defaultUpgrade kernel-64kbUpgrade reiserfs-kmp-64kbUpgrade dtb-allwinnerUpgrade reiserfs-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-develUpgrade kernel-default-extraUpgrade kernel-64kb-develUpgrade kernel-debug-develUpgrade dtb-socionextUpgrade dtb-armUpgrade dtb-renesasUpgrade ocfs2-kmp-rtUpgrade kernel-default-develUpgrade dtb-lgUpgrade dtb-appleUpgrade dlm-kmp-azureUpgrade dtb-broadcomUpgrade ocfs2-kmp-azureUpgrade kernel-default-baseUpgrade dtb-hisiliconUpgrade dtb-caviumUpgrade gfs2-kmp-64kbUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-default-optionalUpgrade reiserfs-kmp-defaultUpgrade kernel-64kb-livepatch-develUpgrade dtb-apmUpgrade dlm-kmp-64kbUpgrade kernel-source-azureUpgrade kernel-rt-develUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-azure-extraUpgrade cluster-md-kmp-azureUpgrade gfs2-kmp-rtUpgrade kernel-symsUpgrade kernel-zfcpdumpUpgrade dtb-amdUpgrade kernel-default-livepatch-develUpgrade dtb-amazonUpgrade kselftests-kmp-defaultUpgrade kernel-kvmsmall-develUpgrade kernel-devel-rtUpgrade kernel-debugUpgrade kernel-64kb-optionalUpgrade gfs2-kmp-azureUpgrade kernel-azure-develUpgrade kernel-debug-livepatch-devel | Aug 14, 2024 | Jul 12, 2024 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1052-gkeopUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-20.04Upgrade linux-image-6.8.0-1012-oracleUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.4.0-1132-awsUpgrade linux-image-6.8.0-1011-raspiUpgrade linux-image-gcpUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1012-oracle-64kUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-6.8.0-44-lowlatencyUpgrade linux-image-raspi2-hwe-18.04Upgrade linux-image-6.8.0-1013-nvidia-lowlatency-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-6.8.0-1014-azureUpgrade linux-image-gcp-lts-20.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-raspi2Upgrade linux-image-5.4.0-1136-gcpUpgrade linux-image-virtual-hwe-18.04Upgrade linux-image-5.4.0-1137-azureUpgrade linux-image-5.4.0-195-generic-lpaeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-5.15.0-1035-xilinx-zynqmpUpgrade linux-image-5.15.0-1068-gcpUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-1067-oracleUpgrade linux-image-5.15.0-121-genericUpgrade linux-image-5.15.0-1064-nvidiaUpgrade linux-image-6.8.0-1012-ibmUpgrade linux-image-5.15.0-1062-raspiUpgrade linux-image-5.4.0-195-genericUpgrade linux-image-5.4.0-195-lowlatencyUpgrade linux-image-kvmUpgrade linux-image-5.15.0-1066-gkeUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-awsUpgrade linux-image-5.4.0-1120-kvmUpgrade linux-image-gkeop-5.15Upgrade linux-image-oem-osp1Upgrade linux-image-gkeUpgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-oem-22.04dUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-1010-gkeUpgrade linux-image-azure-cvmUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-5.15.0-121-generic-lpaeUpgrade linux-image-oemUpgrade linux-image-bluefieldUpgrade linux-image-oem-20.04dUpgrade linux-image-virtualUpgrade linux-image-oem-22.04Upgrade linux-image-5.15.0-1072-azureUpgrade linux-image-oem-22.04bUpgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-gkeop-5.4Upgrade linux-image-6.8.0-44-genericUpgrade linux-image-6.8.0-1015-awsUpgrade linux-image-6.8.0-45-genericUpgrade linux-image-ibmUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-5.4.0-1092-bluefieldUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-azure-lts-20.04Upgrade linux-image-gke-5.15Upgrade linux-image-oem-22.04aUpgrade linux-image-gkeopUpgrade linux-image-nvidia-64kUpgrade linux-image-genericUpgrade linux-image-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-1014-gcpUpgrade linux-image-nvidiaUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-generic-lpaeUpgrade linux-image-azureUpgrade linux-image-5.15.0-121-lowlatency-64kUpgrade linux-image-5.4.0-1051-xilinx-zynqmpUpgrade linux-image-oem-20.04cUpgrade linux-image-azure-fdeUpgrade linux-image-generic-64kUpgrade linux-image-aws-lts-20.04Upgrade linux-image-ibm-classicUpgrade linux-image-nvidia-6.8Upgrade linux-image-5.15.0-1066-kvmUpgrade linux-image-5.15.0-1069-awsUpgrade linux-image-5.4.0-1131-oracleUpgrade linux-image-6.8.0-44-generic-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-azure-lts-22.04Upgrade linux-image-ibm-lts-20.04Upgrade linux-image-raspiUpgrade linux-image-oem-20.04bUpgrade linux-image-5.15.0-121-generic-64kUpgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-6.8.0-44-lowlatency-64kUpgrade linux-image-6.8.0-1013-nvidiaUpgrade linux-image-5.4.0-1043-iotUpgrade linux-image-5.15.0-1064-nvidia-lowlatencyUpgrade linux-image-6.8.0-1012-oemUpgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-45-generic-64kUpgrade linux-image-5.15.0-1064-intel-iotgUpgrade linux-image-6.8.0-1014-azure-fdeUpgrade linux-image-5.4.0-1116-raspiUpgrade linux-image-5.4.0-1099-gkeopUpgrade linux-image-5.15.0-121-lowlatencyUpgrade linux-image-generic-hwe-18.04Upgrade linux-image-intelUpgrade linux-image-6.8.0-1013-nvidia-lowlatencyUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.4.0-1079-ibmUpgrade linux-image-6.8.0-1013-nvidia-64kUpgrade linux-image-5.15.0-1072-azure-fdeUpgrade linux-image-5.15.0-1062-ibm | Sep 12, 2024 | Jul 12, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2025 | Jul 12, 2024 |
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