CVE-2022-49548: linux kernel — Fix

Description

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-129 CWE-129

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.7 — 5.10.120
linux	linux_kernel	5.11 — 5.15.45
linux	linux_kernel	5.16 — 5.17.13
linux	linux_kernel	5.18 — 5.18.2

References

Advisories & Patches

https://git.kernel.org/stable/c/32c4559c61652f24c9fdd5440342196fe37453bc https://git.kernel.org/stable/c/4f8897bcc20b9ae44758e0572538d741ab66f0dc https://git.kernel.org/stable/c/7f845de2863334bed4f362e95853f5e7bc323737 https://git.kernel.org/stable/c/a2aa95b71c9bbec793b5c5fa50f0a80d882b3e8d https://git.kernel.org/stable/c/e36452d5da6325df7c10cffc60a9e68d21e2606d

Frequently Asked Questions

What is CVE-2022-49548? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49548? +

CVE-2022-49548 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49548? +

CVE-2022-49548 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49548? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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