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TI-2026-18438 Aliases CVE-2026-23001GHSA-vgc7-m4r9-xw45

macvlan: fix possible UAF in macvlan_forward_source()

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: 43 fixed, 1 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: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/[email protected]/T/#u

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00206 10th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.249, 5.15.199, 6.1.162 +4Red Hat: 14 advisoriesRed Hat: 43 fixed, 1 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
LinuxLinux3.18 and later5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19Patch availableCNA
  • Linux VendorLinux Affected 3.18 and later Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19 Patch available CNA

CPE configurations NVD · 10

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.18.1 to before 5.10.249; 5.11 to before 5.15.199; 5.16 to before 6.1.162; 6.2 to before 6.6.122; 6.7 to before 6.12.67; 6.13 to before 6.18.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.18:-:*:*:*:*:*:*3.18VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*6.19 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*6.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*6.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*6.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*6.19 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*6.19 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*6.19 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*6.19 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.18.1 to before 5.10.249; 5.11 to before 5.15.199; 5.16 to before 6.1.162; 6.2 to before 6.6.122; 6.7 to before 6.12.67; 6.13 to before 6.18.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.18:-:*:*:*:*:*:* Versions 3.18 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* Versions 6.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* Versions 6.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* Versions 6.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* Versions 6.19 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* Versions 6.19 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* Versions 6.19 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* Versions 6.19 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19

Red Hat 14 advisories

  • RHSA-2026:26535 Released 2026-06-17 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
  • RHSA-2026:25533 Released 2026-06-12 · Red Hat rating Critical
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.195.1.el8_6, kernel-4.18.0-372.195.1.el8_6, kernel-abi-stablelists-4.18.0-372.195.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.195.1.el8_6, kernel-4.18.0-372.195.1.el8_6, kernel-abi-stablelists-4.18.0-372.195.1.el8_6 +14
  • RHSA-2026:10996 Released 2026-04-27 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.70.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.70.1.el10_0, kernel-64k-devel-6.12.0-55.70.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.70.1.el10_0, kernel-64k-6.12.0-55.70.1.el10_0, kernel-64k-core-6.12.0-55.70.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.70.1.el10_0, libperf-6.12.0-55.70.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.70.1.el10_0, kernel-rt-64k-6.12.0-55.70.1.el10_0, kernel-rt-64k-core-6.12.0-55.70.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.70.1.el10_0, kernel-rt-core-6.12.0-55.70.1.el10_0, kernel-rt-debug-6.12.0-55.70.1.el10_0 +11
Show 11 more Red Hat advisories
  • RHSA-2026:9836 Released 2026-04-22 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.175.1.el9_0, kernel-debug-devel-matched-5.14.0-70.175.1.el9_0, kernel-devel-5.14.0-70.175.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.175.1.el9_0, kernel-5.14.0-70.175.1.el9_0, kernel-abi-stablelists-5.14.0-70.175.1.el9_0 +14
  • RHSA-2026:9835 Released 2026-04-22 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.175.1.rt21.247.el9_0, kernel-rt-core-5.14.0-70.175.1.rt21.247.el9_0, kernel-rt-debug-5.14.0-70.175.1.rt21.247.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.175.1.rt21.247.el9_0, kernel-rt-core-5.14.0-70.175.1.rt21.247.el9_0, kernel-rt-debug-5.14.0-70.175.1.rt21.247.el9_0 +7
  • RHSA-2026:6986 Released 2026-04-08 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.164.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.164.1.el9_2, kernel-64k-devel-5.14.0-284.164.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.164.1.el9_2, kernel-5.14.0-284.164.1.el9_2, kernel-64k-5.14.0-284.164.1.el9_2 +29
  • RHSA-2026:6954 Released 2026-04-08 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.135.1.el8_8, kernel-4.18.0-477.135.1.el8_8, kernel-abi-stablelists-4.18.0-477.135.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.135.1.el8_8, kernel-4.18.0-477.135.1.el8_8, kernel-abi-stablelists-4.18.0-477.135.1.el8_8 +14
  • RHSA-2026:6948 Released 2026-04-08 · Red Hat rating Low
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.164.1.rt14.449.el9_2, kernel-rt-core-5.14.0-284.164.1.rt14.449.el9_2, kernel-rt-debug-5.14.0-284.164.1.rt14.449.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.164.1.rt14.449.el9_2, kernel-rt-core-5.14.0-284.164.1.rt14.449.el9_2, kernel-rt-debug-5.14.0-284.164.1.rt14.449.el9_2 +11
  • RHSA-2026:6310 Released 2026-04-01 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.117.1.el9_4, libperf-5.14.0-427.117.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.117.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.117.1.el9_4, kernel-64k-devel-5.14.0-427.117.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.117.1.el9_4, kernel-5.14.0-427.117.1.el9_4, kernel-64k-5.14.0-427.117.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.117.1.el9_4, kernel-rt-core-5.14.0-427.117.1.el9_4, kernel-rt-debug-5.14.0-427.117.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.117.1.el9_4, kernel-rt-core-5.14.0-427.117.1.el9_4, kernel-rt-debug-5.14.0-427.117.1.el9_4 +11
  • RHSA-2026:5197 Released 2026-03-23 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.100.1.el9_6, libperf-5.14.0-570.100.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.100.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.100.1.el9_6, kernel-64k-devel-5.14.0-570.100.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.100.1.el9_6, kernel-64k-5.14.0-570.100.1.el9_6, kernel-64k-core-5.14.0-570.100.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.100.1.el9_6, kernel-rt-64k-5.14.0-570.100.1.el9_6, kernel-rt-64k-core-5.14.0-570.100.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.100.1.el9_6, kernel-rt-core-5.14.0-570.100.1.el9_6, kernel-rt-debug-5.14.0-570.100.1.el9_6 +11
  • RHSA-2026:4012 Released 2026-03-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.43.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.43.1.el10_1, kernel-64k-devel-6.12.0-124.43.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.43.1.el10_1, kernel-64k-6.12.0-124.43.1.el10_1, kernel-64k-core-6.12.0-124.43.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.43.1.el10_1, libperf-6.12.0-124.43.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.43.1.el10_1, kernel-rt-64k-6.12.0-124.43.1.el10_1, kernel-rt-64k-core-6.12.0-124.43.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.43.1.el10_1, kernel-rt-core-6.12.0-124.43.1.el10_1, kernel-rt-debug-6.12.0-124.43.1.el10_1 +9
  • RHSA-2026:3966 Released 2026-03-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.38.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.38.1.el9_7, kernel-64k-devel-5.14.0-611.38.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.38.1.el9_7, kernel-64k-5.14.0-611.38.1.el9_7, kernel-64k-core-5.14.0-611.38.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.38.1.el9_7, libperf-5.14.0-611.38.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.38.1.el9_7, kernel-rt-64k-5.14.0-611.38.1.el9_7, kernel-rt-64k-core-5.14.0-611.38.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.38.1.el9_7, kernel-rt-core-5.14.0-611.38.1.el9_7, kernel-rt-debug-5.14.0-611.38.1.el9_7 +9
  • RHSA-2026:3963 Released 2026-03-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.111.1.el8_10, kernel-4.18.0-553.111.1.el8_10, kernel-abi-stablelists-4.18.0-553.111.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.111.1.el8_10
  • RHSA-2026:3964 Released 2026-03-09 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.111.1.rt7.452.el8_10, kernel-rt-core-4.18.0-553.111.1.rt7.452.el8_10, kernel-rt-debug-4.18.0-553.111.1.rt7.452.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.111.1.rt7.452.el8_10, kernel-rt-core-4.18.0-553.111.1.rt7.452.el8_10, kernel-rt-debug-4.18.0-553.111.1.rt7.452.el8_10 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:6310
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:5197
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:3966
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:9836
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:6986
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:10996
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:6310
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:5197
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:3963
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:3966
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:25533
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:6954
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:9836
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:6986
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:10996
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:6310
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:5197
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:25533
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:6954
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:3963
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:3966
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:10996
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:3964
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:9835
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:3964
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:3966
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:9835
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:6948
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:10996
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:6310
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:5197
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:3966
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:6948
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:10996
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:6310
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:5197
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23001
  2. 2026-10-03 Alias added: GHSA-vgc7-m4r9-xw45
  3. 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