CVE-2024-49977 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: stmmac: Fix zero-division error when disabling tc cbs

The commit b8c43360f6e4 ( et: stmmac: No need to calculate speed divider when offload is disabled) allows the \port_transmit_rate_kbps\ to be set to a value of 0 which is then passed to the \div_s64\ function when tc-cbs is disabled. This leads to a zero-division error.

When tc-cbs is disabled the idleslope sendslope and credit values the credit values are not required to be configured. Therefore adding a return statement after setting the txQ mode to DCB when tc-cbs is disabled would prevent a zero-division error.

CVSS Vector

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

Reference

https://git.kernel.org/stable/c/e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c https://git.kernel.org/stable/c/b0da9504a528f05f97d926b4db74ff21917a33e9 https://git.kernel.org/stable/c/5d43e1ad4567d67af2b42d3ab7c14152ffed25c6 https://git.kernel.org/stable/c/03582f4752427f60817d896f1a827aff772bd31e https://git.kernel.org/stable/c/e297a2bf56d12fd7f91a0c209eb6ea84361f3368 https://git.kernel.org/stable/c/837d9df9c0792902710149d1a5e0991520af0f93 https://git.kernel.org/stable/c/675faf5a14c14a2be0b870db30a70764df81e2df

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5