In the Linux kernel, the following vulnerability has been resolved:
nouveau: fix instmem race condition around ptr stores
Running a lot of VK CTS in parallel against nouveau, once every few hours you might see something like this crash.
BUG: kernel NULL pointer dereference, address: 0000000000000008 PGD 8000000114e6e067 P4D 8000000114e6e067 PUD 109046067 PMD 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 7 PID: 53891 Comm: deqp-vk Not tainted 6.8.0-rc6+ #27 Hardware name: Gigabyte Technology Co., Ltd. Z390 I AORUS PRO WIFI/Z390 I AORUS PRO WIFI-CF, BIOS F8 11/05/2021 RIP: 0010:gp100_vmm_pgt_mem+0xe3/0x180 [nouveau] Code: c7 48 01 c8 49 89 45 58 85 d2 0f 84 95 00 00 00 41 0f b7 46 12 49 8b 7e 08 89 da 42 8d 2c f8 48 8b 47 08 41 83 c7 01 48 89 ee <48> 8b 40 08 ff d0 0f 1f 00 49 8b 7e 08 48 89 d9 48 8d 75 04 48 c1 RSP: 0000:ffffac20c5857838 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 00000000004d8001 RCX: 0000000000000001 RDX: 00000000004d8001 RSI: 00000000000006d8 RDI: ffffa07afe332180 RBP: 00000000000006d8 R08: ffffac20c5857ad0 R09: 0000000000ffff10 R10: 0000000000000001 R11: ffffa07af27e2de0 R12: 000000000000001c R13: ffffac20c5857ad0 R14: ffffa07a96fe9040 R15: 000000000000001c FS: 00007fe395eed7c0(0000) GS:ffffa07e2c980000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000011febe001 CR4: 00000000003706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:
...
? gp100_vmm_pgt_mem+0xe3/0x180 [nouveau] ? gp100_vmm_pgt_mem+0x37/0x180 [nouveau] nvkm_vmm_iter+0x351/0xa20 [nouveau] ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] ? __lock_acquire+0x3ed/0x2170 ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] nvkm_vmm_ptes_get_map+0xc2/0x100 [nouveau] ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] nvkm_vmm_map_locked+0x224/0x3a0 [nouveau]
Adding any sort of useful debug usually makes it go away, so I hand wrote the function in a line, and debugged the asm.
Every so often pt->memory->ptrs is NULL. This ptrs ptr is set in the nv50_instobj_acquire called from nvkm_kmap.
If Thread A and Thread B both get to nv50_instobj_acquire around the same time, and Thread A hits the refcount_set line, and in lockstep thread B succeeds at refcount_inc_not_zero, there is a chance the ptrs value won't have been stored since refcount_set is unordered. Force a memory barrier here, I picked smp_mb, since we want it on all CPUs and it's write followed by a read.
v2: use paired smp_rmb/smp_wmb.
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 |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-abi-stablelistsUpgrade kernel-rt-modules-extraUpgrade kernel-toolsUpgrade kernel-zfcpdump-modulesUpgrade kernel-tools-libs-develUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-modulesUpgrade kernel-rtUpgrade kernelUpgrade kernel-debug-modules-extraUpgrade perfUpgrade kernel-headersUpgrade kernel-cross-headersUpgrade kernel-tools-libsUpgrade kernel-debug-modulesUpgrade kernel-debugUpgrade kernel-rt-debugUpgrade kernel-debug-coreUpgrade kernel-rt-debug-coreUpgrade bpftoolUpgrade python3-perfUpgrade kernel-rt-develUpgrade kernel-debug-develUpgrade kernel-modulesUpgrade kernel-zfcpdumpUpgrade kernel-rt-debug-modules-extraUpgrade kernel-docUpgrade kernel-modules-extraUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-debug-develUpgrade kernel-develUpgrade kernel-coreUpgrade kernel-zfcpdump-develUpgrade kernel-rt-coreUpgrade kernel-rt-debug-modules | Apr 7, 2026 | Apr 6, 2026 |
| Debian | — | Upgrade linux | May 8, 2024 | May 1, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade bpftool | Oct 8, 2024 | May 1, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perfUpgrade bpftool | Oct 8, 2024 | May 1, 2024 |
| Oracle_linux | — | Upgrade kernel | Apr 22, 2026 | May 1, 2024 |
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Dec 5, 2024 | May 1, 2024 |
| Rocky_linux | — | Upgrade kernel-tools-libsUpgrade kernel-rt-debug-coreUpgrade kernel-toolsUpgrade kernel-rt-kvmUpgrade kernel-rt-develUpgrade kernel-debug-debuginfoUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rtUpgrade kernel-rt-modulesUpgrade bpftoolUpgrade kernel-tools-libs-develUpgrade perfUpgrade kernel-rt-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernel-rt-modules-extraUpgrade python3-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-develUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-coreUpgrade kernel-rt-debugUpgrade kernel-rt-debug-develUpgrade kernel-debug-develUpgrade kernel-rt-debug-modules-extraUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-modulesUpgrade kernel-debugUpgrade python3-perfUpgrade kernel-rt-debug-kvmUpgrade kernel-modules-extraUpgrade kernel-coreUpgrade perf-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64 | Apr 14, 2026 | Apr 11, 2026 |
| Suse | — | Upgrade kernel-rt-extraUpgrade kernel-64kb-extraUpgrade reiserfs-kmp-rtUpgrade cluster-md-kmp-defaultUpgrade kernel-rt_debug-vdsoUpgrade dlm-kmp-rtUpgrade kernel-obs-buildUpgrade dtb-xilinxUpgrade kernel-debug-livepatch-develUpgrade dtb-mediatekUpgrade dlm-kmp-defaultUpgrade kernel-docsUpgrade kernel-defaultUpgrade kselftests-kmp-rtUpgrade kernel-source-vanillaUpgrade dtb-qcomUpgrade kernel-rt-livepatchUpgrade dtb-rockchipUpgrade dtb-armUpgrade kernel-devel-rtUpgrade dtb-nvidiaUpgrade kernel-azure-develUpgrade kernel-default-base-rebuildUpgrade gfs2-kmp-defaultUpgrade cluster-md-kmp-64kbUpgrade kernel-rtUpgrade kernel-debug-vdsoUpgrade kernel-rt_debug-livepatch-develUpgrade cluster-md-kmp-rtUpgrade kernel-rt-develUpgrade reiserfs-kmp-azureUpgrade kselftests-kmp-defaultUpgrade kernel-azureUpgrade kernel-syms-rtUpgrade kernel-develUpgrade kernel-rt-livepatch-develUpgrade kernel-default-livepatch-develUpgrade kernel-default-baseUpgrade kernel-default-optionalUpgrade dlm-kmp-azureUpgrade kernel-rt-vdsoUpgrade dtb-sprdUpgrade reiserfs-kmp-defaultUpgrade ocfs2-kmp-azureUpgrade kernel-source-rtUpgrade dtb-lgUpgrade kernel-syms-azureUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-default-extraUpgrade kernel-azure-livepatch-develUpgrade cluster-md-kmp-azureUpgrade kernel-64kb-develUpgrade dtb-amdUpgrade kernel-macrosUpgrade kernel-default-livepatchUpgrade dtb-amlogicUpgrade kselftests-kmp-64kbUpgrade kselftests-kmp-azureUpgrade kernel-kvmsmallUpgrade kernel-zfcpdumpUpgrade kernel-azure-extraUpgrade kernel-64kbUpgrade dtb-hisiliconUpgrade dlm-kmp-64kbUpgrade kernel-default-manUpgrade kernel-azure-vdsoUpgrade kernel-debugUpgrade dtb-alteraUpgrade kernel-rt-optionalUpgrade dtb-apmUpgrade kernel-kvmsmall-vdsoUpgrade kernel-64kb-livepatch-develUpgrade dtb-allwinnerUpgrade gfs2-kmp-azureUpgrade dtb-socionextUpgrade ocfs2-kmp-defaultUpgrade dtb-caviumUpgrade kernel-rt_debugUpgrade kernel-docs-htmlUpgrade dtb-broadcomUpgrade gfs2-kmp-64kbUpgrade dtb-marvellUpgrade reiserfs-kmp-64kbUpgrade kernel-azure-optionalUpgrade dtb-renesasUpgrade kernel-debug-develUpgrade ocfs2-kmp-rtUpgrade kernel-sourceUpgrade dtb-freescaleUpgrade kernel-rt_debug-develUpgrade kernel-obs-qaUpgrade kernel-azure-baseUpgrade kernel-kvmsmall-develUpgrade gfs2-kmp-rtUpgrade dtb-amazonUpgrade kernel-default-develUpgrade kernel-64kb-optionalUpgrade kernel-symsUpgrade dtb-exynosUpgrade dtb-appleUpgrade ocfs2-kmp-64kbUpgrade kernel-default-vdsoUpgrade kernel-devel-azureUpgrade kernel-source-azure | Jun 12, 2024 | May 1, 2024 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1058-raspiUpgrade linux-image-5.15.0-1058-ibmUpgrade linux-image-aws-lts-18.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.15.0-1060-nvidiaUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1009-nvidia-64kUpgrade linux-image-6.8.0-1010-gcpUpgrade linux-image-6.8.0-38-lowlatency-64kUpgrade linux-image-4.15.0-1166-gcpUpgrade linux-image-virtual-hwe-18.04Upgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-oemUpgrade linux-image-gkeop-5.15Upgrade linux-image-5.4.0-189-generic-lpaeUpgrade linux-image-6.8.0-1007-raspiUpgrade linux-image-5.4.0-1128-awsUpgrade linux-image-4.15.0-1135-oracleUpgrade linux-image-oem-20.04Upgrade linux-image-5.15.0-1063-oracleUpgrade linux-image-oem-24.04Upgrade linux-image-azure-cvmUpgrade linux-image-4.15.0-1156-kvmUpgrade linux-image-azureUpgrade linux-image-lowlatency-hwe-16.04Upgrade linux-image-5.4.0-1116-kvmUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-4.15.0-1173-awsUpgrade linux-image-5.4.0-1133-azureUpgrade linux-image-6.8.0-1009-nvidiaUpgrade linux-image-5.4.0-1075-ibmUpgrade linux-image-5.15.0-1065-awsUpgrade linux-image-6.8.0-1008-oracle-64kUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-oem-20.04cUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-oracle-lts-18.04Upgrade linux-image-5.15.0-1035-xilinx-zynqmpUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-awsUpgrade linux-image-5.15.0-116-lowlatencyUpgrade linux-image-5.15.0-1065-gcpUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-1064-gcpUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-5.15.0-1060-nvidia-lowlatencyUpgrade linux-image-5.15.0-1062-kvmUpgrade linux-image-aws-hweUpgrade linux-image-intelUpgrade linux-image-6.8.0-1010-azureUpgrade linux-image-5.4.0-1112-raspiUpgrade linux-image-raspiUpgrade linux-image-5.4.0-1088-bluefieldUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-bluefieldUpgrade linux-image-azure-lts-18.04Upgrade linux-image-6.8.0-1008-oemUpgrade linux-image-5.15.0-1048-gkeopUpgrade linux-image-5.15.0-1068-azureUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-4.15.0-229-genericUpgrade linux-image-6.8.0-38-lowlatencyUpgrade linux-image-5.15.0-1068-azure-fdeUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-5.15.0-116-generic-lpaeUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-gkeop-5.4Upgrade linux-image-oem-20.04dUpgrade linux-image-raspi2Upgrade linux-image-5.4.0-1047-xilinx-zynqmpUpgrade linux-image-ibmUpgrade linux-image-oem-20.04bUpgrade linux-image-5.4.0-1132-gcpUpgrade linux-image-generic-hwe-16.04Upgrade linux-image-genericUpgrade linux-image-oracleUpgrade linux-image-gcp-lts-20.04Upgrade linux-image-5.4.0-1095-gkeopUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1010-azure-fdeUpgrade linux-image-5.15.0-1062-gkeUpgrade linux-image-raspi-nolpaeUpgrade linux-image-6.8.0-1008-oracleUpgrade linux-image-4.15.0-229-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-virtual-hwe-16.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-38-generic-64kUpgrade linux-image-5.15.0-116-genericUpgrade linux-image-5.4.0-189-genericUpgrade linux-image-oem-osp1Upgrade linux-image-5.15.0-116-lowlatency-64kUpgrade linux-image-5.15.0-1060-intel-iotgUpgrade linux-image-gcpUpgrade linux-image-lowlatency-64kUpgrade linux-image-generic-hwe-18.04Upgrade linux-image-nvidia-64kUpgrade linux-image-gcp-lts-18.04Upgrade linux-image-5.4.0-1127-oracleUpgrade linux-image-oracle-64kUpgrade linux-image-5.4.0-189-lowlatencyUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-38-genericUpgrade linux-image-azure-lts-22.04Upgrade linux-image-generic-64kUpgrade linux-image-azure-lts-20.04Upgrade linux-image-5.15.0-116-generic-64kUpgrade linux-image-4.15.0-1181-azureUpgrade linux-image-6.8.0-1011-awsUpgrade linux-image-6.8.0-1006-gkeUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-6.8.0-1007-intelUpgrade linux-image-nvidiaUpgrade linux-image-virtualUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-gke-5.15Upgrade linux-image-6.8.0-1008-ibmUpgrade linux-image-oem-24.04aUpgrade linux-image-aws-lts-20.04Upgrade linux-image-gkeopUpgrade linux-image-5.4.0-1040-iot | Jul 12, 2024 | May 1, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 1, 2024 |
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