CVE-2026-89988

Summary

In the Linux kernel, the following vulnerability has been resolved:

kprobes: Protect kprobe_blacklist with RCU

__within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist() removes blacklist entries and immediately frees them with kfree(). A concurrent call to within_kprobe_blacklist() can therefore dereference freed memory.

Furthermore, within_kprobe_blacklist() can be called in atomic or non-preemptible contexts where the sleeping kprobe_mutex cannot be taken.

Protect kprobe_blacklist with RCU. Use guard(rcu)() and list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim entries safely after a grace period.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 8f406205003f741225f620f0e357ca0de71d45e3affected
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 630ed8734a02b992e8a97538179c2ece42c5210faffected
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 518d9b5568bb06f86e4434f7a30faa9612ea91adaffected
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 5da247e4d1e8661d4d6f997101d59967e8994e32affected
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 6e62cf983a2bd547e6bbd3f935539233e5f97f8faffected
LinuxLinux376e242429bf8539ef39a080ac113c8799840b13 < 0c4256196b3a105307e2235fbfd85e768bbcdd0faffected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References