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CVE-2026-53069

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.5 · Élevée
EPSS 0.4%
Linux•Linux•Versions : <183128da0406b1c10e6f60b7b9fe70788b9c8c1d, <=6.1.*, <=7.0.*, <=6.12.*, 0, 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7, <866d3d9b87751b1944168fd82615505e0c0fd6cf, 6.18.33, <ea690b3b6e58ae00979af8195b4cc24df466b65e, 5.15.209, 6.12.91, <=6.6.*, 6.1.175, <5.15, 6.6.141, <7bad93e99737e4a5c0c14ac50c05152cf4e28022, 7.1, <1921f91298d1388a0bb9db8f83800c998b649cb3, 5.15, <=6.18.*, 7.0.10, <acbf45bd584d924b320bee2a7fe2a26f64904d95, <=*, <=5.15.*, <3128b294b426533c8d9162187446d93a8a160359

Description

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.

Gravité et risque d'exploitation

CVE-2026-53069 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.38 %, ce qui la place devant 30.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <183128da0406b1c10e6f60b7b9fe70788b9c8c1d, <=6.1.*, <=7.0.*, <=6.12.*, 0, 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7, <866d3d9b87751b1944168fd82615505e0c0fd6cf, 6.18.33, <ea690b3b6e58ae00979af8195b4cc24df466b65e, 5.15.209, 6.12.91, <=6.6.*, 6.1.175, <5.15, 6.6.141, <7bad93e99737e4a5c0c14ac50c05152cf4e28022, 7.1, <1921f91298d1388a0bb9db8f83800c998b649cb3, 5.15, <=6.18.*, 7.0.10, <acbf45bd584d924b320bee2a7fe2a26f64904d95, <=*, <=5.15.*, <3128b294b426533c8d9162187446d93a8a160359) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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