CVE-2026-53069High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master syzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via xdp_master_redirect(). Fu…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
In the Linux kernel, the following vulnerability has been resolved:
net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master
syzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via xdp_master_redirect(). Full decoded trace:
https://syzkaller.appspot.com/bug?extid=80e046b8da2820b6ba73
bond_rr_gen_slave_id() dereferences bond->rr_tx_counter, a per-CPU counter that bonding only allocates in bond_open() when the mode is round-robin. If the bond device was never brought up, rr_tx_counter stays NULL.
The XDP redirect path can still reach that code on a bond that was never opened: bpf_master_redirect_enabled_key is a global static key, so as soon as any bond device has native XDP attached, the XDP_TX -> xdp_master_redirect() interception is enabled for every slave system-wide. The path xdp_master_redirect() -> bond_xdp_get_xmit_slave() -> bond_xdp_xmit_roundrobin_slave_get() -> bond_rr_gen_slave_id() then runs against a bond that has no rr_tx_counter and crashes.
Fix this in the generic xdp_master_redirect() by refusing to call into the master's ->ndo_xdp_get_xmit_slave() when the master device is not up. IFF_UP is only set after ->ndo_open() has successfully returned, so this reliably excludes masters whose XDP state has not been fully initialized. Drop the frame with XDP_ABORTED so the exception is visible via trace_xdp_exception() rather than silently falling through. This is not specific to bonding: any current or future master that defers XDP state allocation to ->ndo_open() is protected.
Linux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 3128b294b426533c8d9162187446d93a8a160359Linux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < acbf45bd584d924b320bee2a7fe2a26f64904d95Linux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 866d3d9b87751b1944168fd82615505e0c0fd6cfLinux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 183128da0406b1c10e6f60b7b9fe70788b9c8c1dLinux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 7bad93e99737e4a5c0c14ac50c05152cf4e28022Linux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < ea690b3b6e58ae00979af8195b4cc24df466b65eLinux >= 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 < 1921f91298d1388a0bb9db8f83800c998b649cb3Linux 5.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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