CVE-2024-50161: bpf: Check the remaining info_cnt before repeating btf fields
First published: Thu Nov 07 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the remaining info_cnt before repeating btf fields When trying to repeat the btf fields for array of nested struct, it doesn't check the remaining info_cnt. The following splat will be reported when the value of ret * nelems is greater than BTF_FIELDS_MAX: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in ../kernel/bpf/btf.c:3951:49 index 11 is out of range for type 'btf_field_info [11]' CPU: 6 UID: 0 PID: 411 Comm: test_progs ...... 6.11.0-rc4+ #1 Tainted: [O]=OOT_MODULE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ... Call Trace: <TASK> dump_stack_lvl+0x57/0x70 dump_stack+0x10/0x20 ubsan_epilogue+0x9/0x40 __ubsan_handle_out_of_bounds+0x6f/0x80 ? kallsyms_lookup_name+0x48/0xb0 btf_parse_fields+0x992/0xce0 map_create+0x591/0x770 __sys_bpf+0x229/0x2410 __x64_sys_bpf+0x1f/0x30 x64_sys_call+0x199/0x9f0 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fea56f2cc5d ...... </TASK> ---[ end trace ]--- Fix it by checking the remaining info_cnt in btf_repeat_fields() before repeating the btf fields.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.11<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/6f957d972feee9b385ea3ae6530310a84e55ba71
- https://git.kernel.org/stable/c/797d73ee232dd1833dec4824bc53a22032e97c1c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50161
- https://nvd.nist.gov/vuln/detail/CVE-2024-50161
- https://launchpad.net/bugs/cve/CVE-2024-50161
- https://security-tracker.debian.org/tracker/CVE-2024-50161
- https://ubuntu.com/security/CVE-2024-50161
- https://git.kernel.org/linus/797d73ee232dd1833dec4824bc53a22032e97c1c
Frequently Asked Questions
What is the severity of CVE-2024-50161?
CVE-2024-50161 is considered to have a high severity due to potential impact on system stability.
How do I fix CVE-2024-50161?
To fix CVE-2024-50161, you should upgrade to the patched versions of the Linux kernel recommended by your distribution.
What versions of the Linux kernel are affected by CVE-2024-50161?
CVE-2024-50161 affects Linux kernel versions from 6.11.0 up to 6.11.6, as well as 6.12-rc1, 6.12-rc2, and 6.12-rc3.
Is there a workaround for CVE-2024-50161?
There is no known workaround for CVE-2024-50161 other than applying the appropriate kernel updates.
What is the nature of the vulnerability in CVE-2024-50161?
CVE-2024-50161 is a bug in the BPF subsystem that can lead to improper handling of struct fields when processing nested structures.
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