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Review reviewHigh

CVE-2025-37921

Linux Linux, linux kernel, debian linux

In the Linux kernel, the following vulnerability has been resolved: vxlan: vnifilter: Fix unlocked deletion of default FDB entry When a VNI is deleted from a VXLAN device in 'vnifilter' mode, the FDB entry associated with the default remote (assuming one was configured) is deleted without holding the hash lock. This is wrong and will result in a warning [1] being generated by the lockdep annotation that was added by commit ebe642067455 ("vxlan: Create wrappers for FDB lookup"). Reproducer: # ip link add vx0 up type vxlan dstport 4789 external vnifilter local 192.0.2.1 # bridge vni add vni 1...

CVSS
7.8
EPSS
0.18%
7.25% percentile
CISA KEV
Not listed
Published
2025.05.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.18%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: vxlan: vnifilter: Fix unlocked deletion of default FDB entry When a VNI is deleted from a VXLAN device in 'vnifilter' mode, the FDB entry associated with the default remote (assuming one was configured) is deleted without holding the hash lock. This is wrong and will result in a warning [1] being generated by the lockdep annotation that was added by commit ebe642067455 ("vxlan: Create wrappers for FDB lookup"). Reproducer: # ip link add vx0 up type vxlan dstport 4789 external vnifilter local 192.0.2.1 # bridge vni add vni 1...

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 2d4a121296aa3940d2df9906f955c2b6b4e38bc3, >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 3576e9a80b6c4381b01ce0cbaa07f5e92d4492ed, >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 5cb9e07f84e527974b12e82e2549fa6c0cc6eef0, >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 470206205588559e60035fceb5f256640cb45f99, >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 087a9eb9e5978e3ba362e1163691e41097e8ca20, >= 5.18, >= 5.18 < 6.1.138, >= 6.2 < 6.6.90, >= 6.7 < 6.12.28, >= 6.13 < 6.14.6, 6.15, 11.0
Fixed versions
6.1.138, 6.6.90, 6.12.28, 6.14.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux 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
Not available