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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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-2026-23557Medium· 6.5Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering. In case xenstored was built with NDEBUG #defined nothing bad will happen, as assert() is doing nothing in t…
CVE-2026-23558High· 7.8The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_…
CVE-2026-79609NoneXPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254)
CVE-2026-79611NoneFor 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-2026-79610NoneXSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations
CVE-2026-79607NoneDuring Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing