CVE-2026-97991 Linux kernel vdpa_sim_blk - Out of Bounds Read & Write

Linux kernel vdpa_sim_blk contains an out-of-bounds read/write vulnerability caused by unsigned capacity subtraction underflow in vdpasim_blk_check_range(), letting attackers cause out-of-range buffer access, exploit requires crafted requests.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Denial Of Service, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the patch that rejects out-of-range sector starts.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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