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TI-2026-18707 Aliases CVE-2026-23270GHSA-62jp-jvc3-7hh9

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

Priority LOW 35CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 35 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: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet." act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact). [1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/[email protected]/

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00137 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.15.203, 6.1.167, 6.6.130 +5Red Hat: 12 advisoriesRed Hat: 35 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
LinuxLinux5.15.148 to before 5.15.203; 6.1.75 to before 6.1.167; 6.6.14 to before 6.6.130; 6.7.2 to before 6.85.15.203, 6.1.167, 6.6.130, 6.8Patch availableCNA
LinuxLinux6.8 and later5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.18, 6.19.8, 7.0Patch availableCNA
  • Linux VendorLinux Affected 5.15.148 to before 5.15.203; 6.1.75 to before 6.1.167; 6.6.14 to before 6.6.130; 6.7.2 to before 6.8 Fixed in 5.15.203, 6.1.167, 6.6.130, 6.8 Patch available CNA
  • Linux VendorLinux Affected 6.8 and later Fixed in 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.18, 6.19.8, 7.0 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.15.148 to before 5.15.203; 6.1.75 to before 6.1.167; 6.6.14 to before 6.6.130; 6.7.2 to before 6.8; 6.8 to before 6.12.77; 6.13 to before 6.18.18; 6.19 to before 6.19.8VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*7.0 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*7.0 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15.148 to before 5.15.203; 6.1.75 to before 6.1.167; 6.6.14 to before 6.6.130; 6.7.2 to before 6.8; 6.8 to before 6.12.77; 6.13 to before 6.18.18; 6.19 to before 6.19.8 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.15.203, 6.1.167, 6.6.130, 6.8
  • Fix · CNA Linux (Linux) Fixed in 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.18, 6.19.8, 7.0

Red Hat 12 advisories

  • RHSA-2026:35863 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
  • RHSA-2026:24343 Released 2026-06-08 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.77.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.77.1.el10_0, kernel-64k-devel-6.12.0-55.77.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.77.1.el10_0, kernel-64k-6.12.0-55.77.1.el10_0, kernel-64k-core-6.12.0-55.77.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.77.1.el10_0, libperf-6.12.0-55.77.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.77.1.el10_0, kernel-rt-64k-6.12.0-55.77.1.el10_0, kernel-rt-64k-core-6.12.0-55.77.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.77.1.el10_0, kernel-rt-core-6.12.0-55.77.1.el10_0, kernel-rt-debug-6.12.0-55.77.1.el10_0 +11
  • RHSA-2026:23224 Released 2026-06-04 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.119.1.el9_6, libperf-5.14.0-570.119.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.119.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.119.1.el9_6, kernel-64k-devel-5.14.0-570.119.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.119.1.el9_6, kernel-64k-5.14.0-570.119.1.el9_6, kernel-64k-core-5.14.0-570.119.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.119.1.el9_6, kernel-rt-64k-5.14.0-570.119.1.el9_6, kernel-rt-64k-core-5.14.0-570.119.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.119.1.el9_6, kernel-rt-core-5.14.0-570.119.1.el9_6, kernel-rt-debug-5.14.0-570.119.1.el9_6 +11
Show 9 more Red Hat advisories
  • RHSA-2026:22940 Released 2026-06-03 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.174.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.174.1.el9_2, kernel-64k-devel-5.14.0-284.174.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.174.1.el9_2, kernel-5.14.0-284.174.1.el9_2, kernel-64k-5.14.0-284.174.1.el9_2 +29
  • RHSA-2026:22900 Released 2026-06-03 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core-5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-5.14.0-284.174.1.rt14.459.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core-5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-5.14.0-284.174.1.rt14.459.el9_2 +11
  • RHSA-2026:21745 Released 2026-05-28 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-4.18.0-553.126.1.rt7.467.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-4.18.0-553.126.1.rt7.467.el8_10 +7
  • RHSA-2026:21706 Released 2026-05-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.126.1.el8_10, kernel-4.18.0-553.126.1.el8_10, kernel-abi-stablelists-4.18.0-553.126.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.126.1.el8_10
  • RHSA-2026:21209 Released 2026-05-27 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.127.1.el9_4, libperf-5.14.0-427.127.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.127.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.127.1.el9_4, kernel-64k-devel-5.14.0-427.127.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.127.1.el9_4, kernel-5.14.0-427.127.1.el9_4, kernel-64k-5.14.0-427.127.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.127.1.el9_4, kernel-rt-core-5.14.0-427.127.1.el9_4, kernel-rt-debug-5.14.0-427.127.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.127.1.el9_4, kernel-rt-core-5.14.0-427.127.1.el9_4, kernel-rt-debug-5.14.0-427.127.1.el9_4 +11
  • RHSA-2026:19568 Released 2026-05-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.10.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.10.1.el9_8, kernel-64k-devel-5.14.0-687.10.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.10.1.el9_8, kernel-64k-5.14.0-687.10.1.el9_8, kernel-64k-core-5.14.0-687.10.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.10.1.el9_8, libperf-5.14.0-687.10.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.10.1.el9_8, kernel-rt-64k-5.14.0-687.10.1.el9_8, kernel-rt-64k-core-5.14.0-687.10.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.10.1.el9_8, kernel-rt-core-5.14.0-687.10.1.el9_8, kernel-rt-debug-5.14.0-687.10.1.el9_8 +9
  • RHSA-2026:19569 Released 2026-05-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.16.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.16.1.el10_2, kernel-64k-devel-6.12.0-211.16.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.16.1.el10_2, kernel-64k-6.12.0-211.16.1.el10_2, kernel-64k-core-6.12.0-211.16.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.16.1.el10_2, libperf-6.12.0-211.16.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.16.1.el10_2, kernel-rt-64k-6.12.0-211.16.1.el10_2, kernel-rt-64k-core-6.12.0-211.16.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.16.1.el10_2, kernel-rt-core-6.12.0-211.16.1.el10_2, kernel-rt-debug-6.12.0-211.16.1.el10_2 +9
  • RHSA-2026:13566 Released 2026-05-04 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.55.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.55.1.el10_1, kernel-64k-devel-6.12.0-124.55.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.55.1.el10_1, kernel-64k-6.12.0-124.55.1.el10_1, kernel-64k-core-6.12.0-124.55.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.55.1.el10_1, libperf-6.12.0-124.55.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.55.1.el10_1, kernel-rt-64k-6.12.0-124.55.1.el10_1, kernel-rt-64k-core-6.12.0-124.55.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.55.1.el10_1, kernel-rt-core-6.12.0-124.55.1.el10_1, kernel-rt-debug-6.12.0-124.55.1.el10_1 +9
  • RHSA-2026:13565 Released 2026-05-04 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.54.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.54.1.el9_7, kernel-64k-devel-5.14.0-611.54.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.54.1.el9_7, kernel-64k-5.14.0-611.54.1.el9_7, kernel-64k-core-5.14.0-611.54.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.54.1.el9_7, libperf-5.14.0-611.54.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.54.1.el9_7, kernel-rt-64k-5.14.0-611.54.1.el9_7, kernel-rt-64k-core-5.14.0-611.54.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.54.1.el9_7, kernel-rt-core-5.14.0-611.54.1.el9_7, kernel-rt-debug-5.14.0-611.54.1.el9_7 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:23224
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:13566, RHSA-2026:19569
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:13565, RHSA-2026:19568
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:22940
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:24343
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:23224
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:13566, RHSA-2026:19569
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:21706
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:13565, RHSA-2026:19568
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:35863
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:22940
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:24343
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:23224
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:35863
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:21706
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:13566, RHSA-2026:19569
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:13565, RHSA-2026:19568
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:24343
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:21745
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:21745
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:13566, RHSA-2026:19569
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:13565, RHSA-2026:19568
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:22900
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:24343
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:23224
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:13566, RHSA-2026:19569
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:13565, RHSA-2026:19568
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:22900
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:24343
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:23224
Not affected: 1 product
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23270
  2. 2026-10-03 Alias added: GHSA-62jp-jvc3-7hh9
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP

References

Patch 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-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
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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