In the Linux kernel, the following vulnerability has been resolved:
nubus: Partially revert proc_create_single_data() conversion
The conversion to proc_create_single_data() introduced a regression whereby reading a file in /proc/bus/nubus results in a seg fault:
# grep -r . /proc/bus/nubus/e/ Data read fault at 0x00000020 in Super Data (pc=0x1074c2) BAD KERNEL BUSERR Oops: 00000000 Modules linked in: PC: [<001074c2>] PDE_DATA+0xc/0x16 SR: 2010 SP: 38284958 a2: 01152370 d0: 00000001 d1: 01013000 d2: 01002790 d3: 00000000 d4: 00000001 d5: 0008ce2e a0: 00000000 a1: 00222a40 Process grep (pid: 45, task=142f8727) Frame format=B ssw=074d isc=2008 isb=4e5e daddr=00000020 dobuf=01199e70 baddr=001074c8 dibuf=ffffffff ver=f Stack from 01199e48: 01199e70 00222a58 01002790 00000000 011a3000 01199eb0 015000c0 00000000 00000000 01199ec0 01199ec0 000d551a 011a3000 00000001 00000000 00018000 d003f000 00000003 00000001 0002800d 01052840 01199fa8 c01f8000 00000000 00000029 0b532b80 00000000 00000000 00000029 0b532b80 01199ee4 00103640 011198c0 d003f000 00018000 01199fa8 00000000 011198c0 00000000 01199f4c 000b3344 011198c0 d003f000 00018000 01199fa8 00000000 00018000 011198c0 Call Trace: [<00222a58>] nubus_proc_rsrc_show+0x18/0xa0 [<000d551a>] seq_read+0xc4/0x510 [<00018000>] fp_fcos+0x2/0x82 [<0002800d>] __sys_setreuid+0x115/0x1c6 [<00103640>] proc_reg_read+0x5c/0xb0 [<00018000>] fp_fcos+0x2/0x82 [<000b3344>] __vfs_read+0x2c/0x13c [<00018000>] fp_fcos+0x2/0x82 [<00018000>] fp_fcos+0x2/0x82 [<000b8aa2>] sys_statx+0x60/0x7e [<000b34b6>] vfs_read+0x62/0x12a [<00018000>] fp_fcos+0x2/0x82 [<00018000>] fp_fcos+0x2/0x82 [<000b39c2>] ksys_read+0x48/0xbe [<00018000>] fp_fcos+0x2/0x82 [<000b3a4e>] sys_read+0x16/0x1a [<00018000>] fp_fcos+0x2/0x82 [<00002b84>] syscall+0x8/0xc [<00018000>] fp_fcos+0x2/0x82 [<0000c016>] not_ext+0xa/0x18 Code: 4e5e 4e75 4e56 0000 206e 0008 2068 ffe8 <2068> 0020 2008 4e5e 4e75 4e56 0000 2f0b 206e 0008 2068 0004 2668 0020 206b ffe8 Disabling lock debugging due to kernel taint
Segmentation fault
The proc_create_single_data() conversion does not work because single_open(file, nubus_proc_rsrc_show, PDE_DATA(inode)) is not equivalent to the original code.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernelUpgrade kernel-headersUpgrade python-perfUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.15.120-74.144Upgrade kernel-develUpgrade perfUpgrade kernel-toolsUpgrade kernel-livepatch-5.10.192-182.736 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade python3-perf-debuginfoUpgrade kernel-toolsUpgrade bpftoolUpgrade kernelUpgrade kernel-libbpf-staticUpgrade kernel-libbpf-develUpgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.38-59.109Upgrade kernel-libbpfUpgrade kernel-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade python3-perfUpgrade perf-debuginfoUpgrade kernel-headersUpgrade perf | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-toolsUpgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelists | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libs | Mar 10, 2026 | Mar 10, 2026 |
| Ubuntu | — | Upgrade linux-nvidia-tegraUpgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-raspiUpgrade linux-nvidia-tegra-5.15Upgrade linux-gkeUpgrade linux-awsUpgrade linux-riscv-5.15Upgrade linux-bluefieldUpgrade linux-ibm-5.15Upgrade linux-azure-fdeUpgrade linux-nvidia-tegra-igxUpgrade linux-intel-iotg-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-azure-5.15Upgrade linux-lowlatencyUpgrade linux-gkeopUpgrade linux-nvidiaUpgrade linux-gcp-5.15Upgrade linux-intel-iotgUpgrade linux-gcpUpgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-oracleUpgrade linux-kvmUpgrade linux-oracle-5.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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