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CVE-2023-34319

HIGHCVSS 7.8/10EPSS 0.30%

Last modified

CVE-2023-34319 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.30%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
XenXen>= 3.2.0
DebianDebian Linux10.0
LinuxLinux Kernel>= 4.9.336, < 4.10
LinuxLinux Kernel>= 4.14.302, < 4.14.321
LinuxLinux Kernel>= 4.19.269, < 4.19.290
LinuxLinux Kernel>= 5.4.227, < 5.4.252
LinuxLinux Kernel>= 5.10.159, < 5.10.189
LinuxLinux Kernel>= 5.15.83, < 5.15.125
LinuxLinux Kernel>= 6.1.13, < 6.1.44
LinuxLinux Kernel>= 6.2, < 6.4.9

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-34319?
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
How severe is CVE-2023-34319?
CVE-2023-34319 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.
How do I fix CVE-2023-34319?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-34319?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST