CVE-2022-49058: linux kernel Buffer Overflow — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: potential buffer overflow in handling symlinks Smatch printed a warning: arch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error: __memcpy() 'dctx->buf' too small (16 vs u32max) It's caused because Smatch marks 'link_len' as untrusted since it comes from sscanf(). Add a check to ensure that 'link_len' is not larger than the size of the 'link_str' buffer.

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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-120 CWE-120

Affected Products

Vendor	Product	Versions
linux	linux_kernel	2.6.37 — 4.9.311
linux	linux_kernel	4.10 — 4.14.276
linux	linux_kernel	4.15 — 4.19.239
linux	linux_kernel	4.20 — 5.4.190
linux	linux_kernel	5.5 — 5.10.112
linux	linux_kernel	5.11 — 5.15.35
linux	linux_kernel	5.16 — 5.17.4
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1316c28569a80ab3596eeab05bf5e01991e7e739 https://git.kernel.org/stable/c/22d658c6c5affed10c8907e67160cef0b6c92186 https://git.kernel.org/stable/c/3e582749e742e662a8e9bb37cffac62dccaaa1e2 https://git.kernel.org/stable/c/4e166a41180be2f1e66bbb6d46448e80a9a5ec05 https://git.kernel.org/stable/c/515e7ba11ef043d6febe69389949c8ef5f25e9d0 https://git.kernel.org/stable/c/64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304 https://git.kernel.org/stable/c/9901b07ba42b39266b34a888e48d7306fd707bee https://git.kernel.org/stable/c/eb5f51756944735ac70cd8bb38637cc202e29c91

Frequently Asked Questions

What is CVE-2022-49058? +

In the Linux kernel, the following vulnerability has been resolved: cifs: potential buffer overflow in handling symlinks Smatch printed a warning: arch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error: __memcpy() 'dctx->buf' too small (16 vs u32max) It's caused because Smatch marks 'link_len' as untrusted since it comes from sscanf(). Add a check to ensure that 'link_len' is not larger than the size of the 'link_str' buffer. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49058? +

CVE-2022-49058 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-2022-49058? +

CVE-2022-49058 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-2022-49058? +

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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