CVE-2024-57843: Linux Kernel integer overflow (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix overflow inside virtnet_rq_alloc When the frag just got a page, then may lead to regression on VM. Specially if the sysctl net.core.high_order_alloc_disable value is 1, then the frag always get a page when do refill. Which could see reliable crashes or scp failure (scp a file 100M in size to VM). The issue is that the virtnet_rq_dma takes up 16 bytes at the beginning of a new frag. When the frag size is larger than PAGE_SIZE, everything is fine. However, if the frag is only one page and the total size of the buffer and virtnet_rq_dma is larger than one page, an overflow may occur. The commit f9dac92ba908 ("virtio_ring: enable premapped mode whatever use_dma_api") introduced this problem. And we reverted some commits to fix this in last linux version. Now we try to enable it and fix this bug directly. Here, when the frag size is not enough, we reduce the buffer len to fix this problem.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Linux Kernel≥ 6.7 < 6.12.5 · < 6.6.66

Remediation

Fixed in

Linux Kernel≥ 6.12.5

Patch & vendor advisories

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2024-57843 being actively exploited?

CVE-2024-57843 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.41%.

How severe is CVE-2024-57843?

CVE-2024-57843 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2024-57843?

Affected products include Linux Kernel.

How do I fix CVE-2024-57843?

Upgrade affected software to a fixed version, for example Linux Kernel 6.12.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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