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TI-2025-15716 Aliases CVE-2025-21764GHSA-j8mq-pfgm-36r2

ndisc: use RCU protection in ndisc_alloc_skb()

Priority LOW 36CWE-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: 34 fixed, 3 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: ndisc: use RCU protection in ndisc_alloc_skb() ndisc_alloc_skb() can be called without RTNL or RCU being held. Add RCU protection to avoid possible UAF.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00271 19th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.291, 5.10.235, 5.15.179 +5Red Hat: 13 advisoriesRed Hat: 34 fixed, 3 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
LinuxLinux3.9 and later5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.79, 6.12.16, 6.13.4, 6.14Patch availableCNA
  • Linux VendorLinux Affected 3.9 and later Fixed in 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.79, 6.12.16, 6.13.4, 6.14 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.9 to before 5.4.291; 5.5 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.129; 6.2 to before 6.6.79; 6.7 to before 6.12.16; 6.13 to before 6.13.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*6.14 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*6.14 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.9 to before 5.4.291; 5.5 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.129; 6.2 to before 6.6.79; 6.7 to before 6.12.16; 6.13 to before 6.13.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* Versions 6.14 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* Versions 6.14 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.79, 6.12.16, 6.13.4, 6.14

Red Hat 13 advisories

  • RHSA-2025:10211 Released 2025-07-02 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.100.1.el8_8, kernel-4.18.0-477.100.1.el8_8, kernel-abi-stablelists-4.18.0-477.100.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.100.1.el8_8, kernel-4.18.0-477.100.1.el8_8, kernel-abi-stablelists-4.18.0-477.100.1.el8_8 +14
  • RHSA-2025:9584 Released 2025-06-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.74.1.el9_4, libperf-5.14.0-427.74.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.74.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.74.1.el9_4, kernel-64k-devel-5.14.0-427.74.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.74.1.el9_4, kernel-5.14.0-427.74.1.el9_4, kernel-64k-5.14.0-427.74.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.74.1.el9_4, kernel-rt-core-5.14.0-427.74.1.el9_4, kernel-rt-debug-5.14.0-427.74.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.74.1.el9_4, kernel-rt-core-5.14.0-427.74.1.el9_4, kernel-rt-debug-5.14.0-427.74.1.el9_4 +11
  • RHSA-2025:9580 Released 2025-06-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.58.1.el8_10, kernel-4.18.0-553.58.1.el8_10, kernel-abi-stablelists-4.18.0-553.58.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.58.1.el8_10
Show 10 more Red Hat advisories
  • RHSA-2025:9581 Released 2025-06-25 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.58.1.rt7.399.el8_10, kernel-rt-core-4.18.0-553.58.1.rt7.399.el8_10, kernel-rt-debug-4.18.0-553.58.1.rt7.399.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.58.1.rt7.399.el8_10, kernel-rt-core-4.18.0-553.58.1.rt7.399.el8_10, kernel-rt-debug-4.18.0-553.58.1.rt7.399.el8_10 +7
  • RHSA-2025:9498 Released 2025-06-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.149.1.el8_6, kernel-4.18.0-372.149.1.el8_6, kernel-abi-stablelists-4.18.0-372.149.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.149.1.el8_6, kernel-4.18.0-372.149.1.el8_6, kernel-abi-stablelists-4.18.0-372.149.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.149.1.el8_6, kernel-4.18.0-372.149.1.el8_6, kernel-abi-stablelists-4.18.0-372.149.1.el8_6 +14
  • RHSA-2025:9494 Released 2025-06-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.134.1.el9_0, kernel-debug-devel-matched-5.14.0-70.134.1.el9_0, kernel-devel-5.14.0-70.134.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.134.1.el9_0, kernel-5.14.0-70.134.1.el9_0, kernel-abi-stablelists-5.14.0-70.134.1.el9_0 +14
  • RHSA-2025:9491 Released 2025-06-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.121.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.121.1.el9_2, kernel-64k-devel-5.14.0-284.121.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.121.1.el9_2, kernel-5.14.0-284.121.1.el9_2, kernel-64k-5.14.0-284.121.1.el9_2 +29
  • RHSA-2025:9490 Released 2025-06-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.154.1.el8_2, kernel-4.18.0-193.154.1.el8_2, kernel-abi-whitelists-4.18.0-193.154.1.el8_2 +14
  • RHSA-2025:9497 Released 2025-06-24 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.159.1.el8_4, kernel-4.18.0-305.159.1.el8_4, kernel-abi-stablelists-4.18.0-305.159.1.el8_4 +14
  • RHSA-2025:9492 Released 2025-06-24 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.121.1.rt14.406.el9_2, kernel-rt-core-5.14.0-284.121.1.rt14.406.el9_2, kernel-rt-debug-5.14.0-284.121.1.rt14.406.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.121.1.rt14.406.el9_2, kernel-rt-core-5.14.0-284.121.1.rt14.406.el9_2, kernel-rt-debug-5.14.0-284.121.1.rt14.406.el9_2 +11
  • RHSA-2025:9493 Released 2025-06-24 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.134.1.rt21.206.el9_0, kernel-rt-core-5.14.0-70.134.1.rt21.206.el9_0, kernel-rt-debug-5.14.0-70.134.1.rt21.206.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.134.1.rt21.206.el9_0, kernel-rt-core-5.14.0-70.134.1.rt21.206.el9_0, kernel-rt-debug-5.14.0-70.134.1.rt21.206.el9_0 +7
  • RHSA-2025:9079 Released 2025-06-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.17.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.17.1.el10_0, kernel-64k-devel-6.12.0-55.17.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.17.1.el10_0, kernel-64k-6.12.0-55.17.1.el10_0, kernel-64k-core-6.12.0-55.17.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.17.1.el10_0, libperf-6.12.0-55.17.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.17.1.el10_0, kernel-rt-64k-6.12.0-55.17.1.el10_0, kernel-rt-64k-core-6.12.0-55.17.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.17.1.el10_0, kernel-rt-core-6.12.0-55.17.1.el10_0, kernel-rt-debug-6.12.0-55.17.1.el10_0 +11
  • RHSA-2025:8333 Released 2025-06-02 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.19.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.19.1.el9_6, kernel-64k-devel-5.14.0-570.19.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.19.1.el9_6, kernel-64k-5.14.0-570.19.1.el9_6, kernel-64k-core-5.14.0-570.19.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.19.1.el9_6, libperf-5.14.0-570.19.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.19.1.el9_6, kernel-rt-64k-5.14.0-570.19.1.el9_6, kernel-rt-64k-core-5.14.0-570.19.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.19.1.el9_6, kernel-rt-core-5.14.0-570.19.1.el9_6, kernel-rt-debug-5.14.0-570.19.1.el9_6 +11

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 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2025:9584
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:9079
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:8333
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:9494
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:9491
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:9584
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:9079
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2025:9580
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:8333
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2025:9490
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2025:9497
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2025:9498
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2025:9498
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2025:10211
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2025:9494
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2025:9491
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2025:9584
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2025:9498
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2025:10211
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:9580
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:9079
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:8333
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2025:9581
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2025:9493
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2025:9581
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:9079
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:8333
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2025:9493
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2025:9492
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2025:9584
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:9079
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:8333
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2025:9492
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2025:9584

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-21764
  2. 2026-10-03 Alias added: GHSA-j8mq-pfgm-36r2
  3. 2026-10-29 Affected versions changed · Red Hat

References

Patch 8

  • 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