CVE-2026-72085
Xen scsiback kernel bug lets a pvSCSI guest cause LUN DoS and may panic the host.
Is CVE-2026-72085 being exploited?
Not confirmed. CVE-2026-72085 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.18% probability of exploitation in the next 30 days.
How severe is CVE-2026-72085?
CVE-2026-72085 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72085?
Yes. A fix has been recorded for CVE-2026-72085. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72085 affect?
CVE-2026-72085 affects Linux kernel (Xen scsiback / vscsibk), Xen hosts running scsiback, pvSCSI guests on affected hosts. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72085?
Apply Linux kernel/Xen scsiback patches immediately; update hosts and restrict untrusted guests.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A paravirtualized (pvSCSI) guest can leak command tags to stop a LUN (DoS) and may trigger host panic; underflow can lead to use-after-free conditions.
Immediate action required
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < 9c0f6894982b1f13bda220707497b25ac9c95bdb
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < a13b789497a7fdd27d4d63f5c69d23db706ef0fe
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < fa588f28401102652068c4cc75e135507f4b5106
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < fcd64d4d97af5d9736f31040f8ed8cd4c17e4c45
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < f1516c56ac540da1769f264c3cfefe4499548a5d
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < 1e97c404e44991fb087c38ccd7414f2d326f9b74
- affected>= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e and < ca978f8a93d4d36841839bf2847d29b88c2591d6
- affected4.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.