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TI-2025-26394 Aliases CVE-2025-39718GHSA-4whh-7h4c-xh74

vsock/virtio: Validate length in packet header before skb_put()

Priority LOW 38CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 19 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: Validate length in packet header before skb_put() When receiving a vsock packet in the guest, only the virtqueue buffer size is validated prior to virtio_vsock_skb_rx_put(). Unfortunately, virtio_vsock_skb_rx_put() uses the length from the packet header as the length argument to skb_put(), potentially resulting in SKB overflow if the host has gone wonky. Validate the length as advertised by the packet header before calling virtio_vsock_skb_rx_put().

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00167 6th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.149, 6.6.103, 6.12.44 +2Red Hat: 7 advisoriesRed Hat: 19 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
LinuxLinux6.1.63 to before 6.1.1496.1.149Patch availableCNA
LinuxLinux6.3 and later6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17Patch availableCNA
  • Linux VendorLinux Affected 6.1.63 to before 6.1.149 Fixed in 6.1.149 Patch available CNA
  • Linux VendorLinux Affected 6.3 and later Fixed in 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.1.63 to before 6.1.149; 6.3 to before 6.6.103; 6.7 to before 6.12.44; 6.13 to before 6.16.4VulnerableLinux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.1.63 to before 6.1.149; 6.3 to before 6.6.103; 6.7 to before 6.12.44; 6.13 to before 6.16.4 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.149
  • Fix · CNA Linux (Linux) Fixed in 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17

Red Hat 7 advisories

  • RHSA-2025:21398 Released 2025-11-17 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.84.1.el8_10, kernel-4.18.0-553.84.1.el8_10, kernel-abi-stablelists-4.18.0-553.84.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.84.1.el8_10
  • RHSA-2025:21397 Released 2025-11-17 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.84.1.rt7.425.el8_10, kernel-rt-core-4.18.0-553.84.1.rt7.425.el8_10, kernel-rt-debug-4.18.0-553.84.1.rt7.425.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.84.1.rt7.425.el8_10, kernel-rt-core-4.18.0-553.84.1.rt7.425.el8_10, kernel-rt-debug-4.18.0-553.84.1.rt7.425.el8_10 +7
  • RHSA-2025:21118 Released 2025-11-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.9.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.9.1.el10_1, kernel-64k-devel-6.12.0-124.9.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.9.1.el10_1, kernel-64k-6.12.0-124.9.1.el10_1, kernel-64k-core-6.12.0-124.9.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.9.1.el10_1, libperf-6.12.0-124.9.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.9.1.el10_1, kernel-rt-64k-6.12.0-124.9.1.el10_1, kernel-rt-64k-core-6.12.0-124.9.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.9.1.el10_1, kernel-rt-core-6.12.0-124.9.1.el10_1, kernel-rt-debug-6.12.0-124.9.1.el10_1 +9
Show 4 more Red Hat advisories
  • RHSA-2025:21112 Released 2025-11-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.7.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.7.1.el9_7, kernel-64k-devel-5.14.0-611.7.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.7.1.el9_7, kernel-64k-5.14.0-611.7.1.el9_7, kernel-64k-core-5.14.0-611.7.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.7.1.el9_7, libperf-5.14.0-611.7.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.7.1.el9_7, kernel-rt-64k-5.14.0-611.7.1.el9_7, kernel-rt-64k-core-5.14.0-611.7.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.7.1.el9_7, kernel-rt-core-5.14.0-611.7.1.el9_7, kernel-rt-debug-5.14.0-611.7.1.el9_7 +9
  • RHSA-2025:19105 Released 2025-10-27 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.58.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.58.1.el9_6, kernel-64k-devel-5.14.0-570.58.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.58.1.el9_6, kernel-64k-5.14.0-570.58.1.el9_6, kernel-64k-core-5.14.0-570.58.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.58.1.el9_6, libperf-5.14.0-570.58.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.58.1.el9_6, kernel-rt-64k-5.14.0-570.58.1.el9_6, kernel-rt-64k-core-5.14.0-570.58.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.58.1.el9_6, kernel-rt-core-5.14.0-570.58.1.el9_6, kernel-rt-debug-5.14.0-570.58.1.el9_6 +11
  • RHSA-2025:19106 Released 2025-10-27 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.41.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.41.1.el10_0, kernel-64k-devel-6.12.0-55.41.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.41.1.el10_0, kernel-64k-6.12.0-55.41.1.el10_0, kernel-64k-core-6.12.0-55.41.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.41.1.el10_0, libperf-6.12.0-55.41.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.41.1.el10_0, kernel-rt-64k-6.12.0-55.41.1.el10_0, kernel-rt-64k-core-6.12.0-55.41.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.41.1.el10_0, kernel-rt-core-6.12.0-55.41.1.el10_0, kernel-rt-debug-6.12.0-55.41.1.el10_0 +11
  • RHSA-2025:19104 Released 2025-10-27 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.96.1.el9_4, libperf-5.14.0-427.96.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.96.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.96.1.el9_4, kernel-64k-devel-5.14.0-427.96.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.96.1.el9_4, kernel-5.14.0-427.96.1.el9_4, kernel-64k-5.14.0-427.96.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.96.1.el9_4, kernel-rt-core-5.14.0-427.96.1.el9_4, kernel-rt-debug-5.14.0-427.96.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.96.1.el9_4, kernel-rt-core-5.14.0-427.96.1.el9_4, kernel-rt-debug-5.14.0-427.96.1.el9_4 +11

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-2025:19104
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:19106, RHSA-2025:21118
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:19105, RHSA-2025:21112
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:19106, RHSA-2025:21118
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2025:21398
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:19105, RHSA-2025:21112
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:21398
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:19106, RHSA-2025:21118
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:19105, RHSA-2025:21112
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2025:21397
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2025:21397
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:19106, RHSA-2025:21118
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:19105, RHSA-2025:21112
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2025:19104
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:19106, RHSA-2025:21118
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:19105, RHSA-2025:21112
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2025:19104
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-39718
  2. 2026-10-03 Alias added: GHSA-4whh-7h4c-xh74
  3. 2026-10-16 CISA SSVC decision points changed

References

Patch 5

Advisory 1

  • 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