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Review reviewHigh

CVE-2023-53192

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix nexthop hash size The nexthop code expects a 31 bit hash, such as what is returned by fib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash returned by skb_get_hash() can lead to problems related to the fact that 'int hash' is a negative number when the MSB is set. In the case of hash threshold nexthop groups, nexthop_select_path_hthr() will disproportionately select the first nexthop group entry. In the case of resilient nexthop groups, nexthop_select_path_res() may do an out of bounds access in...

CVSS
7.8
EPSS
0.35%
28.1% percentile
CISA KEV
Not listed
Published
2025.09.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.35%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix nexthop hash size The nexthop code expects a 31 bit hash, such as what is returned by fib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash returned by skb_get_hash() can lead to problems related to the fact that 'int hash' is a negative number when the MSB is set. In the case of hash threshold nexthop groups, nexthop_select_path_hthr() will disproportionately select the first nexthop group entry. In the case of resilient nexthop groups, nexthop_select_path_res() may do an out of bounds access in...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 1274e1cc42264d4e629841e4f182795cb0becfd2 < c650597647ecb318d02372277bdfd866c6829f78, >= 1274e1cc42264d4e629841e4f182795cb0becfd2 < 32ef2c0c6cf11a076f0280a7866b9abc47821e19, >= 1274e1cc42264d4e629841e4f182795cb0becfd2 < 7b8717658dff8b471cbfc124bf9b5ca4229579ed, >= 1274e1cc42264d4e629841e4f182795cb0becfd2 < 23c195ce6f4aec86e1c9e1ea1c800381c4b465c7, >= 1274e1cc42264d4e629841e4f182795cb0becfd2 < 0756384fb1bd38adb2ebcfd1307422f433a1d772, >= 5.8, >= 5.8 < 5.10.190, >= 5.11 < 5.15.126, >= 5.16 < 6.1.45, >= 6.2 < 6.4.10, 6.5
Fixed versions
5.10.190, 5.15.126, 6.1.45, 6.4.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-129
CVE-2023-53192 — Linux Linux, linux kernel | SECUFOCUS NOW