ieee802154: hwsim: serialize pib updates to fix double-free
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.158, 6.12.111, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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().
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From f25da51fdc381ca2863248c7060b3662632f0872 · fixed in e3b4681197aa026bd2d79358de5a3d62b76b04b9; From f25da51fdc381ca2863248c7060b3662632f0872 · fixed in 9973b3a67a7592a780ea12b08334539a900deec1; From f25da51fdc381ca2863248c7060b3662632f0872 · fixed in d3b8f264ce09573aededd0a97dc41c8147797d8f; From f25da51fdc381ca2863248c7060b3662632f0872 · fixed in db6442deecb1f13aeaf4f9d77746ea7555630fb3; From f25da51fdc381ca2863248c7060b3662632f0872 · fixed in 979d5b8de8ed4e1f997aef12da5694b99be7b871
- Linux Linux
4.19
- KernelLinux
From 4.19.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7