9.8

CVE-2025-40176: tls: wait for pending async decryptions if tls_strp_msg_hold fails

Deferred
AliasesUBUNTU-CVE-2025-40176DEBIAN-CVE-2025-40176
Published 12-11-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-40176 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 41.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.49%
0%100%
Low · +0.06 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 38 · Related 30
DLA-4379-1OPENSUSE-SU-2025:20172-1RHSA-2025:23241RHSA-2026:0453RHSA-2026:0457RHSA-2026:0489

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tls: wait for pending async decryptions if tls_strp_msg_hold fails Async decryption calls tls_strp_msg_hold to create a clone of the input skb to hold references to the memory it uses. If we fail to allocate that clone, proceeding with async decryption can lead to various issues (UAF on the skb, writing into userspace memory after the recv() call has returned). In this case, wait for all pending decryption requests.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

Increase +0.06 pp

From 0.43% 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

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu127 products
  • linux< 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 9f83fd0c179e0f458e824e417f9d5ad53443f685 | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < c61d4368197d65c4809d9271f3b85325a600586a | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 39dec4ea3daf77f684308576baf483b55ca7f160 | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 4fc109d0ab196bd943b7451276690fb6bb48c2e0 | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < b8a6ff84abbcbbc445463de58704686011edc8e1 | 6.0

3 vendors · 129 products

References

24 links
Show all 24 references