kprobes: Protect kprobe_blacklist with RCU
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 6 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89988
- 2026-10-03 Alias added: GHSA-8536-v82h-gp8m
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-30 Fix available: Linux/Linux@3fb8386682ef4d0858c38bf0d8d8a47ba171fa23, Linux/[email protected], Linux/[email protected] +1 · CNA
- 2026-10-30 2 new references · CNA
- 2026-11-01 Affected versions changed · Red Hat
- 2026-11-01 CVSS score added · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/3fb8386682ef4d0858c38bf0d8d8a47ba171fa23
- https://git.kernel.org/stable/c/5d97a13defc648c64d138145ace429b6a3d08943
- https://git.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3
- https://git.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210f
- https://git.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91ad
- https://git.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32
- https://git.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8f
- https://git.kernel.org/stable/c/0c4256196b3a105307e2235fbfd85e768bbcdd0f
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Sources
- CVE-2026-89988 · CVE Program
- CVE-2026-89988 · NVD
- FIRST EPSS
- GHSA-8536-v82h-gp8m · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89988 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences