5.5

CVE-2026-23138: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-23138DEBIAN-CVE-2026-23138CGA-26hj-rvxf-xw5h
Published 14-02-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-23138 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.14%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 23 · Related 24
OPENSUSE-SU-2026:20572-1SUSE-SU-2026:21230-1SUSE-SU-2026:21237-1USN-8567-1USN-8570-1USN-8570-2

Timeline

  1. 14-02-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Add recursion protection in kernel stack trace recording A bug was reported about an infinite recursion caused by tracing the rcu events with the kernel stack trace trigger enabled. The stack trace code called back into RCU which then called the stack trace again. Expand the ftrace recursion protection to add a set of bits to protect events from recursion. Each bit represents the context that the event is in (normal, softirq, interrupt and NMI). Have the stack trace code use the interrupt context to protect against recursion. Note, the bug showed an issue in both the RCU code as well as the tracing stacktrace code. This only handles the tracing stack trace side of the bug. The RCU fix will be handled separately.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.02 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu145 products
  • linuxAll versions (No fix recorded) | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard5 products
  • linux-aws-6.12< 6.12.77-r1 | < 6.12.77-r2 | < 6.12.80-r0 | < 6.12.78-r0
  • linux-azure-6.12< 6.12.77-r2 | < 6.12.77-r1 | < 6.12.78-r0 | < 6.12.80-r0
  • linux-gcp-6.12< 6.12.77-r2 | < 6.12.77-r1 | < 6.12.78-r0 | < 6.12.80-r0
  • linux-qemu-6.12< 6.12.77-r1 | < 6.12.77-r2 | < 6.12.78-r0 | < 6.12.80-r0
  • linux-vmware-6.12< 6.12.77-r2 | < 6.12.78-r0 | < 6.12.77-r1 | < 6.12.80-r0
Linux2 products
  • linux≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 9b03768037d91ce727effb1c5d92d2c7781bf692 | ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe | ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 5b7f91acffd2c4c000971553d22efa1e1bb4feae | ≥ 5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce, < 5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb | 5.8
  • linux_kernel≥ 5.8, < 6.18.6 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.85-1 | < 6.18.8-1

4 vendors · 153 products

References

29 links
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