7.5

CVE-2026-31676: rxrpc: only handle RESPONSE during service challenge

Modified
AliasesUBUNTU-CVE-2026-31676DEBIAN-CVE-2026-31676
Published 25-04-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-31676 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 40.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (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
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · -0.24 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 20 · Related 20
USN-8371-1USN-8373-1USN-8374-1USN-8393-1USN-8440-1USN-8497-1

Timeline

  1. 25-04-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

Decrease -0.24 pp

From 0.72% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-124.124 | < 6.17.0-35.35
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1057.60 | < 6.17.0-1017.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < a1a8efde03a40b6c658d580e96644d9b9a2a0d3a | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < 6c3a0fbdafef8316e34ae22333e317a341e737cd | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < 0afdfd4941c1b60a1f5c361760daa970edca60cd | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < a6bcf8010af093fe04f7100562e9542ab7882585 | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < 29b44d904dceb832be880def08b8cb17a0aba91c | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < d0035e634dae83237ab7f5681eb52b2f65d0ceb8 | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < 03fd2ef73cb4ffd0af100a95b634af54f474414e | ≥ 17926a79320afa9b95df6b977b40cca6d8713cea, < c43ffdcfdbb5567b1f143556df8a04b4eeea041c | 2.6.22
  • linux_kernel≥ 2.6.22, < 6.6.136 | ≥ 6.7, < 6.12.84 | ≥ 6.13, < 6.18.23 | ≥ 6.19, < 6.19.13 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.13-1

3 vendors · 160 products

References

34 links
Show all 34 references