8.4

CVE-2025-39718: vsock/virtio: Validate length in packet header before skb_put()

Modified
AliasesRHSA-2025:21397RHSA-2025:21398UBUNTU-CVE-2025-39718
Published 05-09-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-39718 is a high (CVSS 8.4) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 42 · Related 32
DLA-4328-1DSA-6008-1DSA-6009-1MGASA-2025-0234MGASA-2025-0235OPENSUSE-SU-2025:20081-1

Timeline

  1. 05-09-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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().

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu122 products
  • linux< 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Redhat49 products
  • bpftool< 0:4.18.0-553.84.1.el8_10
  • bpftool-debuginfo< 0:4.18.0-553.84.1.el8_10
  • kernel< 0:4.18.0-553.84.1.el8_10
  • kernel-abi-stablelists< 0:4.18.0-553.84.1.el8_10
  • kernel-core< 0:4.18.0-553.84.1.el8_10
Debian2 products
  • linux< 6.1.153-1 | < 6.12.48-1 | < 6.16.5-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ baddcc2c71572968cdaeee1c4ab3dc0ad90fa765, < 969b06bd8b7560efb100a34227619e7d318fbe05 | ≥ 71dc9ec9ac7d3eee785cdc986c3daeb821381e20, < ee438c492b2e0705d819ac0e25d04fae758d8f8f | ≥ 71dc9ec9ac7d3eee785cdc986c3daeb821381e20, < faf332a10372390ce65d0b803888f4b25a388335 | ≥ 71dc9ec9ac7d3eee785cdc986c3daeb821381e20, < 676f03760ca1d69c2470cef36c44dc152494b47c | ≥ 71dc9ec9ac7d3eee785cdc986c3daeb821381e20, < 0dab92484474587b82e8e0455839eaf5ac7bf894 | ≥ 6.1.63, < 6.1.149 | 6.3
  • linux_kernel≥ 6.1.63, < 6.1.149 | ≥ 6.3, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4

4 vendors · 175 products

References

36 links
Show all 36 references