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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-97599

ieee802154: hwsim: serialize pib updates to fix double-free

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ieee802154: hwsim: serialize pib updates to fix double-free hwsim_update_pib() does an unserialized read-swap-free of phy->pib: pib_old = rtnl_dereference(phy->pib); ... rcu_assign_pointer(phy->pib, pib); kfree_rcu(pib_old, rcu); It assumes the RTNL is held, but ->set_channel is not always called under it: the mac802154 scan worker changes channels via drv_set_channel() without the RTNL. Such an update can race an RTNL-held one on the same phy; both read the same pib_old and both kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves batching kfree_rcu(), this surfaces as a KASAN invalid-free in rcu_free_sheaf(). struct hwsim_phy has no lock for pib. Add one and make the swap atomic with rcu_replace_pointer() under it, dropping the misleading rtnl_dereference().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f25da51fdc381ca2863248c7060b3662632f0872 to < e3b4681197aa026bd2d79358de5a3d62b76b04b9affected
  • f25da51fdc381ca2863248c7060b3662632f0872 to < 9973b3a67a7592a780ea12b08334539a900deec1affected
  • f25da51fdc381ca2863248c7060b3662632f0872 to < d3b8f264ce09573aededd0a97dc41c8147797d8faffected
  • f25da51fdc381ca2863248c7060b3662632f0872 to < db6442deecb1f13aeaf4f9d77746ea7555630fb3affected
  • f25da51fdc381ca2863248c7060b3662632f0872 to < 979d5b8de8ed4e1f997aef12da5694b99be7b871affected

Linux Linux

Default version status: affected

  • 4.19affected
  • 0 to < 4.19unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References