CVE-2023-53217
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-12-03

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-09-15
Last Modified
2025-12-03
Generated
2026-05-07
AI Q&A
2025-09-15
EPSS Evaluated
2026-05-05
NVD
CVE-2023-53217
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 4.18 (inc) to 5.10.188 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.120 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.38 (exc)
linux linux_kernel From 6.2 (inc) to 6.3.12 (exc)
linux linux_kernel From 6.4 (inc) to 6.4.2 (exc)
Helpful Resources
Exploitability
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CWE ID Description
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a regression in the Linux kernel related to the nubus subsystem. A change converting code to use proc_create_single_data() caused a segmentation fault when reading files in /proc/bus/nubus. The issue arises because the new code using single_open(file, nubus_proc_rsrc_show, PDE_DATA(inode)) is not equivalent to the original implementation, leading to a kernel crash (segmentation fault) when accessing certain proc files.


How can this vulnerability impact me? :

This vulnerability can cause a kernel crash (segmentation fault) when reading files in /proc/bus/nubus, potentially leading to system instability or denial of service. Users or processes attempting to access these proc files may cause the kernel to fault, which could disrupt normal system operations.


How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by attempting to read files under /proc/bus/nubus and observing if a segmentation fault or kernel oops occurs. For example, running the command `grep -r . /proc/bus/nubus/e/` may trigger the fault and produce kernel error messages similar to those described in the vulnerability details.


What immediate steps should I take to mitigate this vulnerability?

Immediate mitigation involves avoiding reading files in /proc/bus/nubus until the kernel is patched. Applying the kernel update that reverts the proc_create_single_data() conversion for nubus is necessary to resolve the issue.


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