Bug 2355468 (CVE-2023-52997)

Summary: CVE-2023-52997 kernel: ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A vulnerability was found in the Linux kernel's `ip_metrics_convert()` function, where improper handling of user input can potentially leak kernel memory via side channels. This issue is caused by the use of `@type`, a user-controlled input, which is an array within this function. If a CPU speculatively executes instructions past the conditional branch before the branch condition is resolved, the line `metrics[type - 1] = val` may be evaluated. A situation where `type` is out-of-bounds could lead to improper kernel memory access.
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Description OSIDB Bzimport 2025-03-27 17:02:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()

if (!type)
		continue;
	if (type > RTAX_MAX)
		return -EINVAL;
	...
	metrics[type - 1] = val;

@type being used as an array index, we need to prevent
cpu speculation or risk leaking kernel memory content.
Comment 1 Robb Gatica 2025-03-27 23:34:55 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032710-CVE-2023-52997-dbca@gregkh/T