ReviewHigh

CVE-2021-45485

linux kernel, e-series santricity os controller

In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

CVSS
7.5
EPSS
3.58%
88.6% percentile
CISA KEV
Not listed
Published
2021.12.25
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability3.58%
Technical severityCVSS 7.5

Vulnerability overview

In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

Affected product and versions

Product
linux kernel, e-series santricity os controller
Affected versions
< 4.4.276, >= 4.5 < 4.9.276, >= 4.10 < 4.14.240, >= 4.15 < 4.19.198, >= 4.20 < 5.4.133, >= 5.5 < 5.10.51, >= 5.11 < 5.12.18, >= 5.13 < 5.13.3, 22.1.3, 22.1.1, 22.2.0
Fixed versions
4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.133, 5.10.51, 5.12.18, 5.13.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that linux kernel, e-series santricity os controller and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-327