CVE-2026-101307 RACK stack - Out-of-Bounds Write

The RACK stack contains an out-of-bounds write caused by repeated doubling of a 16-bit allocation counter that wraps to zero during PCM sample array expansion, letting remote attackers cause kernel panic by sending many ACKs on an established TCP connection.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out Of Bounds Rw
Impact
Denial Of Service
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
15 October 2026
Updated
16 October 2026
Weakness
CWE-122

Vendor fix

Update to the latest version with the fix for the allocation counter wrap issue.

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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