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TI-2026-46094 Aliases CVE-2026-64530GHSA-w5h3-gv63-49vp

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

Priority MEDIUM 50CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

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: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again. tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF. tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct (with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream) Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00655 51st percentileScored 2026-11-07
Fix Fixed Linux (Linux): 5.15.212, 6.1.178, 6.6.145 +5Red Hat: 16 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
LinuxLinux5.15.148 to before 5.15.212; 6.1.75 to before 6.1.178; 6.6.14 to before 6.6.145; 6.7.2 to before 6.85.15.212, 6.1.178, 6.6.145, 6.8Patch availableCNA
LinuxLinux6.8 and later5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2Patch availableCNA
  • Linux VendorLinux Affected 5.15.148 to before 5.15.212; 6.1.75 to before 6.1.178; 6.6.14 to before 6.6.145; 6.7.2 to before 6.8 Fixed in 5.15.212, 6.1.178, 6.6.145, 6.8 Patch available CNA
  • Linux VendorLinux Affected 6.8 and later Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 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 5.15.212, 6.1.178, 6.6.145, 6.8
  • Fix · CNA Linux (Linux) Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2

Red Hat 16 advisories

  • RHSA-2026:67277 Released 2026-09-14 · Red Hat rating Important
    kernel security update
    • NVIDIA for RHEL 10 kernel-6.12.0-231.19.el10nv, kernel-64k-6.12.0-231.19.el10nv, kernel-64k-core-6.12.0-231.19.el10nv +38
  • RHSA-2026:55761 Released 2026-08-19 · Red Hat rating Important
    kpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_130_1, kpatch-patch-4_18_0-477_143_1, and kpatch-patch-4_18_0-477_97_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) kpatch-patch-4_18_0-477_107_1-1-12.el8_8, kpatch-patch-4_18_0-477_120_1-1-11.el8_8, kpatch-patch-4_18_0-477_130_1-1-9.el8_8 +2
  • RHSA-2026:56225 Released 2026-08-18 · Red Hat rating Important
    kpatch-patch-5_14_0-570_116_1, kpatch-patch-5_14_0-570_17_1, kpatch-patch-5_14_0-570_39_1, kpatch-patch-5_14_0-570_66_1, and kpatch-patch-5_14_0-570_94_1 security update
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-7.el9_6, kpatch-patch-5_14_0-570_17_1-1-22.el9_6, kpatch-patch-5_14_0-570_39_1-1-13.el9_6 +2
Show 13 more Red Hat advisories
  • RHSA-2026:56224 Released 2026-08-18 · Red Hat rating Important
    kpatch-patch-5_14_0-427_100_1, kpatch-patch-5_14_0-427_113_1, kpatch-patch-5_14_0-427_126_1, kpatch-patch-5_14_0-427_68_2, and kpatch-patch-5_14_0-427_84_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1-1-12.el9_4, kpatch-patch-5_14_0-427_113_1-1-10.el9_4, kpatch-patch-5_14_0-427_126_1-1-7.el9_4 +2
  • RHSA-2026:55837 Released 2026-08-17 · Red Hat rating Important
    kpatch-patch-5_14_0-284_117_1, kpatch-patch-5_14_0-284_134_1, kpatch-patch-5_14_0-284_148_1, kpatch-patch-5_14_0-284_158_1, and kpatch-patch-5_14_0-284_172_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) kpatch-patch-5_14_0-284_117_1-1-19.el9_2, kpatch-patch-5_14_0-284_134_1-1-13.el9_2, kpatch-patch-5_14_0-284_148_1-1-11.el9_2 +2
  • RHSA-2026:55763 Released 2026-08-17 · Red Hat rating Important
    kpatch-patch-5_14_0-687_10_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-6.el9_8
  • RHSA-2026:55762 Released 2026-08-17 · Red Hat rating Important
    kpatch-patch-4_18_0-553_109_1, kpatch-patch-4_18_0-553_125_1, kpatch-patch-4_18_0-553_53_1, kpatch-patch-4_18_0-553_72_1, and kpatch-patch-4_18_0-553_85_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-553_109_1-1-9.el8_10, kpatch-patch-4_18_0-553_125_1-1-6.el8_10, kpatch-patch-4_18_0-553_53_1-1-16.el8_10 +2
  • RHSA-2026:55618 Released 2026-08-17 · Red Hat rating Important
    kpatch-patch-6_12_0-211_16_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-1-6.el10_2
  • RHSA-2026:49212 Released 2026-07-31 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.33.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.33.1.el9_8, kernel-64k-devel-5.14.0-687.33.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.33.1.el9_8, kernel-64k-5.14.0-687.33.1.el9_8, kernel-64k-core-5.14.0-687.33.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.33.1.el9_8, libperf-5.14.0-687.33.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.33.1.el9_8, kernel-rt-64k-5.14.0-687.33.1.el9_8, kernel-rt-64k-core-5.14.0-687.33.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.33.1.el9_8, kernel-rt-core-5.14.0-687.33.1.el9_8, kernel-rt-debug-5.14.0-687.33.1.el9_8 +9
  • RHSA-2026:49211 Released 2026-07-31 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.42.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.42.1.el10_2, kernel-64k-devel-6.12.0-211.42.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.42.1.el10_2, kernel-64k-6.12.0-211.42.1.el10_2, kernel-64k-core-6.12.0-211.42.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.42.1.el10_2, libperf-6.12.0-211.42.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.42.1.el10_2, kernel-rt-64k-6.12.0-211.42.1.el10_2, kernel-rt-64k-core-6.12.0-211.42.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.42.1.el10_2, kernel-rt-core-6.12.0-211.42.1.el10_2, kernel-rt-debug-6.12.0-211.42.1.el10_2 +9
  • RHSA-2026:49214 Released 2026-07-31 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.150.1.el8_10, kernel-4.18.0-553.150.1.el8_10, kernel-abi-stablelists-4.18.0-553.150.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.150.1.el8_10
  • RHSA-2026:49213 Released 2026-07-31 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core-4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-4.18.0-553.150.1.rt7.491.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core-4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-4.18.0-553.150.1.rt7.491.el8_10 +7
  • RHSA-2026:49032 Released 2026-07-31 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.184.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.184.1.el9_2, kernel-64k-devel-5.14.0-284.184.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.184.1.el9_2, kernel-5.14.0-284.184.1.el9_2, kernel-64k-5.14.0-284.184.1.el9_2 +29
  • RHSA-2026:49033 Released 2026-07-31 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.204.1.el8_6, kernel-4.18.0-372.204.1.el8_6, kernel-abi-stablelists-4.18.0-372.204.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.204.1.el8_6, kernel-4.18.0-372.204.1.el8_6, kernel-abi-stablelists-4.18.0-372.204.1.el8_6 +14
  • RHSA-2026:48222 Released 2026-07-29 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-core-5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-5.14.0-284.184.1.rt14.469.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-core-5.14.0-284.184.1.rt14.469.el9_2, kernel-rt-debug-5.14.0-284.184.1.rt14.469.el9_2 +11
  • RHSA-2026:47620 Released 2026-07-29 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.93.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.93.1.el10_0, kernel-64k-devel-6.12.0-55.93.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.93.1.el10_0, kernel-64k-6.12.0-55.93.1.el10_0, kernel-64k-core-6.12.0-55.93.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.93.1.el10_0, libperf-6.12.0-55.93.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.93.1.el10_0, kernel-rt-64k-6.12.0-55.93.1.el10_0, kernel-rt-64k-core-6.12.0-55.93.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.93.1.el10_0, kernel-rt-core-6.12.0-55.93.1.el10_0, kernel-rt-debug-6.12.0-55.93.1.el10_0 +11

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
NVIDIA for RHEL 10Fixed RHSA-2026:67277
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:49211
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:49212
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:49032
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:47620
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:49211, RHSA-2026:55618
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:49214, RHSA-2026:55762
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:49212, RHSA-2026:55763
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:49033
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:55761
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:49032, RHSA-2026:55837
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:56224
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:47620
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:56225
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:49033
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:49214
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:49211
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:49212
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:47620
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:49213
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:49213
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:49211
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:49212
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:48222
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:47620
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:49211
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:49212
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:48222
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:47620
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64530
  2. 2026-10-03 Alias added: GHSA-w5h3-gv63-49vp
  3. 2026-10-07 Affected versions changed · Red Hat
  4. 2026-10-14 EPSS moved to the below the 50th percentile
  5. 2026-10-16 CISA SSVC decision points changed
  6. 2026-10-20 Weakness changed · CISA ADP
  7. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 7

  • 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