In the Linux kernel, the following vulnerability has been resolved:
block: Avoid mounting the bdev pseudo-filesystem in userspace
The bdev pseudo-filesystem is an internal kernel filesystem with which userspace should not interfere. Unregister it so that userspace cannot even attempt to mount it.
This fixes a bug [1] that occurs when attempting to access files, because the system call move_mount() uses pointers declared in the inode_operations structure, which for the bdev pseudo-filesystem are always equal to 0. `inode->i_op = &empty_iops;`
[1]
BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 23380067 P4D 23380067 PUD 23381067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI CPU: 2 PID: 17125 Comm: syz-executor.0 Not tainted 6.1.155-syzkaller-00350-g84221fde2681 #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:0x0
Call Trace: <TASK> lookup_open.isra.0+0x700/0x1180 fs/namei.c:3460 open_last_lookups fs/namei.c:3550 [inline] path_openat+0x953/0x2700 fs/namei.c:3780 do_filp_open+0x1c5/0x410 fs/namei.c:3810 do_sys_openat2+0x171/0x4d0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x13c/0x1f0 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18Upgrade kernel-headersUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade bpftool6.18-debuginfoUpgrade perf-debuginfoUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-modules-extraUpgrade kernel-develUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-livepatch-6.18.38-73.137Upgrade kernel6.18-tools-develUpgrade kernel6.18-modules-extraUpgrade python3-perf-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade python3-perf6.18Upgrade bpftoolUpgrade microvm-kernel6.18Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-toolsUpgrade kernel-modules-extra-commonUpgrade python3-perfUpgrade kernel-livepatch-6.1.180-225.360Upgrade kernel6.18-develUpgrade kernel-debuginfo-common-x86_64Upgrade perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade bpftool6.18Upgrade kernel6.18-debuginfo-common-x86_64 | Aug 10, 2026 | Jul 19, 2026 |
| Debian | — | Upgrade linux-6.1Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 22, 2026 | Jul 19, 2026 |
| Ubuntu | — | Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-7.0Upgrade linux-image-ibmUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-generic-64k-7.0Upgrade linux-image-awsUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-virtual-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-oracle-7.0Upgrade linux-image-oracleUpgrade linux-image-generic-7.0Upgrade linux-image-oem-26.04bUpgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-gcpUpgrade linux-image-raspi-7.0Upgrade linux-image-virtualUpgrade linux-image-raspiUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidiaUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-oem-26.04aUpgrade linux-image-nvidia-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-generic-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-genericUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-azureUpgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-gkeUpgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-gke-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-realtime-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-realtimeUpgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-nvidia-bosUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gke-64kUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-aws-7.0 | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 3, 2026 | Jul 19, 2026 |
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