CVE-2024-50161

Description

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.

Reserved 2024-10-21 | Published 2024-11-07 | Updated 2024-11-19 | Assigner Linux

Product status

Default status
unaffected

64e8ee814819 before 6f957d972fee
affected

64e8ee814819 before 797d73ee232d
affected

Default status
affected

6.11
affected

Any version before 6.11
unaffected

6.11.6
unaffected

6.12
unaffected

References

git.kernel.org/...c/6f957d972feee9b385ea3ae6530310a84e55ba71

git.kernel.org/...c/797d73ee232dd1833dec4824bc53a22032e97c1c

cve.org (CVE-2024-50161)

nvd.nist.gov (CVE-2024-50161)

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