CVE-2023-34319High· 7.8▾ TwilightThe 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 ext…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
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.
xen >= 3.2.0debian_linux = 10.0linux_kernel >= 4.9.336, < 4.10linux_kernel >= 4.14.302, < 4.14.321linux_kernel >= 4.19.269, < 4.19.290linux_kernel >= 5.4.227, < 5.4.252linux_kernel >= 5.10.159, < 5.10.189linux_kernel >= 5.15.83, < 5.15.125linux_kernel >= 6.1.13, < 6.1.44linux_kernel >= 6.2, < 6.4.9Upgrade past the affected range:
linux_kernel 6.4.9Connected by shared product, vendor, weakness, or advisory.
CVE-2026-79609High· 8.8XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254)
CVE-2026-79610High· 8.8XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations
CVE-2026-79611Medium· 5.5For XSA-308 logic was introduced, as VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state…
CVE-2026-79608Critical· 9.8The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied …
CVE-2026-79607Medium· 5.5During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing
CVE-2026-102700Medium· 4.7With its original introduction, GNTTAB_cache_flush was made available uniformly