5.5

CVE-2025-21871: linux Infinite Loop

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21871DEBIAN-CVE-2025-21871
Published 27-03-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-21871 is a medium (CVSS 5.5) Infinite Loop vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.9% 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
0.21%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 52 · Related 50
DLA-4178-1DLA-4193-1DSA-5900-1SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1SUSE-SU-2025:01967-1

Timeline

  1. 27-03-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix supplicant wait loop OP-TEE supplicant is a user-space daemon and it's possible for it be hung or crashed or killed in the middle of processing an OP-TEE RPC call. It becomes more complicated when there is incorrect shutdown ordering of the supplicant process vs the OP-TEE client application which can eventually lead to system hang-up waiting for the closure of the client application. Allow the client process waiting in kernel for supplicant response to be killed rather than indefinitely waiting in an unkillable state. Also, a normal uninterruptible wait should not have resulted in the hung-task watchdog getting triggered, but the endless loop would. This fixes issues observed during system reboot/shutdown when supplicant got hung for some reason or gets crashed/killed which lead to client getting hung in an unkillable state. It in turn lead to system being in hung up state requiring hard power off/on to recover.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

+0.01 pp

From 0.20% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.21%

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

Affected systems

Ubuntu136 products
  • linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-78.78
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1035.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < 3eb4911364c764572e9db4ab900a57689a54e8ce | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < 0180cf0373f84fff61b16f8c062553a13dd7cfca | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < c0a9a948159153be145f9471435695373904ee6d | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < ec18520f5edc20a00c34a8c9fdd6507c355e880f | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < d61cc1a435e6894bfb0dd3370c6f765d2d12825d | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < fd9d2d6124c293e40797a080adf8a9c237efd8b8 | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < 21234efe2a8474a6d2d01ea9573319de7858ce44 | ≥ 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2, < 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 | 4.12
  • linux_kernel≥ 4.12, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.130 | ≥ 6.2, < 6.6.80 | ≥ 6.7, < 6.12.17 | ≥ 6.13, < 6.13.5 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3
Debian1 product
  • linux< 6.1.133-1 | < 6.12.17-1

3 vendors · 139 products

References

53 links
Show all 53 references