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TI-2026-48188 Aliases CVE-2026-68409GHSA-g5f7-qj4q-4w5v

wifi: mac80211: defer link RX stats percpu free to RCU

Priority MEDIUM 40CWE-416Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: defer link RX stats percpu free to RCU sta_remove_link() frees a removed MLO link's RX stats percpu buffer right away, but defers only the link container to RCU: sta_info_free_link(&alloc->info); kfree_rcu(alloc, rcu_head); The RX fast path reads link_sta under rcu_read_lock and writes the percpu stats. A reader that resolved link_sta before the removal keeps the pointer. The container stays alive from the kfree_rcu, so the read still works. But the percpu block it points to is already freed. This needs uses_rss. That is when pcpu_rx_stats exists. The full STA teardown frees the deflink stats only after synchronize_net(). The link removal path had no such barrier. The race is hard to win in practice, but the free should still wait for RCU. Free the link together with its data from a single RCU callback, so the percpu block is reclaimed only after readers drain.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.191, 6.6.160, 6.12.114 +3Red Hat: 4 advisoriesRed Hat: 14 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.0 and later6.1.191, 6.6.160, 6.12.114, 6.18.42, 7.1.6, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.42, 7.1.6, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.42, 7.1.6, 7.2

Red Hat 4 advisories

  • RHSA-2026:83156 Released 2026-10-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.58.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.58.1.el9_8, kernel-64k-devel-5.14.0-687.58.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.58.1.el9_8, kernel-64k-5.14.0-687.58.1.el9_8, kernel-64k-core-5.14.0-687.58.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.58.1.el9_8, libperf-5.14.0-687.58.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.58.1.el9_8, kernel-rt-64k-5.14.0-687.58.1.el9_8, kernel-rt-64k-core-5.14.0-687.58.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.58.1.el9_8, kernel-rt-core-5.14.0-687.58.1.el9_8, kernel-rt-debug-5.14.0-687.58.1.el9_8 +9
  • RHSA-2026:82807 Released 2026-10-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.173.1.el8_10, kernel-4.18.0-553.173.1.el8_10, kernel-abi-stablelists-4.18.0-553.173.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.173.1.el8_10
  • RHSA-2026:82806 Released 2026-10-14 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-core-4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-debug-4.18.0-553.173.1.rt7.514.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-core-4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-debug-4.18.0-553.173.1.rt7.514.el8_10 +7
Show 1 more Red Hat advisories
  • RHSA-2026:65334 Released 2026-09-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.53.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.53.1.el10_2, kernel-64k-devel-6.12.0-211.53.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.53.1.el10_2, kernel-64k-6.12.0-211.53.1.el10_2, kernel-64k-core-6.12.0-211.53.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.53.1.el10_2, libperf-6.12.0-211.53.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.53.1.el10_2, kernel-rt-64k-6.12.0-211.53.1.el10_2, kernel-rt-64k-core-6.12.0-211.53.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.53.1.el10_2, kernel-rt-core-6.12.0-211.53.1.el10_2, kernel-rt-debug-6.12.0-211.53.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux for NVIDIA 26AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:65334
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:83156
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:65334
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:82807
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:83156
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:82807
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:65334
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:83156
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:82806
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:82806
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:65334
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:83156
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:65334
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:83156
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-68409
  2. 2026-10-03 Alias added: GHSA-g5f7-qj4q-4w5v
  3. 2026-10-15 Fix available: RHSA-2026:82806 · Red Hat
  4. 2026-10-15 Fix available: RHSA-2026:82807 · Red Hat
  5. 2026-10-16 Fix available: RHSA-2026:83156 · Red Hat
  6. 2026-10-16 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux BaseOS (v. 9) +6 · Red Hat
  7. 2026-10-16 CISA SSVC decision points changed
  8. 2026-10-16 Priority changed: LOW → MEDIUM
  9. 2026-10-20 Weakness changed · CISA ADP
  10. 2026-10-21 Fix available: Linux/[email protected], Linux/[email protected], Linux/Linux@a5afc00280986063f1c355821544fabbb2a960f7 +1 · CNA
  11. 2026-10-21 2 new references · CNA
  12. 2026-10-30 Affected versions changed · Red Hat
  13. 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@acd5931d5adf12f0163f83dc00320e7011f4da92 · CNA
  14. 2026-10-30 1 new reference · CNA

References

Other 6

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences