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CVE-2026-97599

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9973b3a67a7592a780ea12b08334539a900deec1Also 979d5b8de8ed4e1f997aef12da5694b99be7b871CVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 9973b3a67a7592a780ea12b08334539a900deec1LinuxCVE List
  • 979d5b8de8ed4e1f997aef12da5694b99be7b871LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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().

Text from CVE List

Affected versions 12

  • Linuxaffected: f25da51fdc381ca2863248c7060b3662632f0872 before e3b4681197aa026bd2d79358de5a3d62b76b04b9CVE List
  • Linuxaffected: f25da51fdc381ca2863248c7060b3662632f0872 before 9973b3a67a7592a780ea12b08334539a900deec1CVE List
  • Linuxaffected: f25da51fdc381ca2863248c7060b3662632f0872 before d3b8f264ce09573aededd0a97dc41c8147797d8fCVE List
  • Linuxaffected: f25da51fdc381ca2863248c7060b3662632f0872 before db6442deecb1f13aeaf4f9d77746ea7555630fb3CVE List
  • Linuxaffected: f25da51fdc381ca2863248c7060b3662632f0872 before 979d5b8de8ed4e1f997aef12da5694b99be7b871CVE List
  • Linuxaffected: 4.19CVE List
  • Linuxunaffected: all versions before 4.19CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5