Bug 2347871 (CVE-2022-49548)

Summary: CVE-2022-49548 kernel: bpf: Fix potential array overflow in bpf_trampoline_get_progs()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:09:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix potential array overflow in bpf_trampoline_get_progs()

The cnt value in the 'cnt >= BPF_MAX_TRAMP_PROGS' check does not
include BPF_TRAMP_MODIFY_RETURN bpf programs, so the number of
the attached BPF_TRAMP_MODIFY_RETURN bpf programs in a trampoline
can exceed BPF_MAX_TRAMP_PROGS.

When this happens, the assignment '*progs++ = aux->prog' in
bpf_trampoline_get_progs() will cause progs array overflow as the
progs field in the bpf_tramp_progs struct can only hold at most
BPF_MAX_TRAMP_PROGS bpf programs.
Comment 1 Avinash Hanwate 2025-02-26 11:43:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022615-CVE-2022-49548-47fe@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 16:01:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022615-CVE-2022-49548-47fe@gregkh/T