CVE-2026-99030 Linux Kernel - Information Disclosure

Linux kernel contains an information disclosure vulnerability caused by skb_copy_and_csum_bits() leaving stale bytes in buffers used for outgoing packets, letting attackers potentially leak memory contents, exploit requires crafted packets triggering the flaw.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

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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