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Review reviewHigh

CVE-2026-64545

Linux

In the Linux kernel, the following vulnerability has been resolved: net, bpf: check master for NULL in xdp_master_redirect() xdp_master_redirect() dereferences the result of netdev_master_upper_dev_get_rcu() without a NULL check, but that helper returns NULL when the receiving device has no upper-master adjacency. The reach guard only checks netif_is_bond_slave(). On bond slave release bond_upper_dev_unlink() drops the upper-master adjacency before clearing IFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window still passes netif_is_bond_slave() while master is already NULL,...

CVSS
7.5
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net, bpf: check master for NULL in xdp_master_redirect() xdp_master_redirect() dereferences the result of netdev_master_upper_dev_get_rcu() without a NULL check, but that helper returns NULL when the receiving device has no upper-master adjacency. The reach guard only checks netif_is_bond_slave(). On bond slave release bond_upper_dev_unlink() drops the upper-master adjacency before clearing IFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window still passes netif_is_bond_slave() while master is already NULL,...

Affected product and versions

Product
Linux
Affected versions
>= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < c99ca049e910d61ddbd28cc2c47242f2bfbb4970, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < e2a56441233131fe18a76001de347ecda217e40c, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 3876318ea54e83eb70982b8280a3c5e4e32269bf, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 4edbcacca09f92b85d3951b6add11894b20a84bc, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 03b743586a2469744e96e9c1015096d07240935d, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 89c103d702b25ceb2d097faf854deb47b53b17ff, >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < e82d8cc4321c373dc46e741cd2dfdaa7921fddb7, >= 5.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that 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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available