5.5

CVE-2021-47086: phonet/pep: refuse to enable an unbound pipe

Analyzed
AliasesUBUNTU-CVE-2021-47086DEBIAN-CVE-2021-47086
Published 04-03-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47086 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.23%
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 5 · Related 5
SUSE-SU-2024:2894-1SUSE-SU-2024:2939-1SUSE-SU-2024:2947-1USN-7183-1USN-7184-1

Timeline

  1. 04-03-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: phonet/pep: refuse to enable an unbound pipe This ioctl() implicitly assumed that the socket was already bound to a valid local socket name, i.e. Phonet object. If the socket was not bound, two separate problems would occur: 1) We'd send an pipe enablement request with an invalid source object. 2) Later socket calls could BUG on the socket unexpectedly being connected yet not bound to a valid object.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu88 products
  • linuxAll versions (No fix recorded) | < 4.4.0-262.296 | < 4.15.0-169.177 | < 5.4.0-105.119
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1139.145 | < 4.4.0-1177.192 | < 4.15.0-1121.129 | < 5.4.0-1069.73
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 0bbdd62ce9d44f3a22059b3d20a0df977d9f6d59 | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < b10c7d745615a092a50c2e03ce70446d2bec2aca | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 311601f114859d586d5ef8833d60d3aa23282161 | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 982b6ba1ce626ef87e5c29f26f2401897554f235 | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 48c76fc53582e7f13c1e0b11c916e503256c4d0b | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 52ad5da8e316fa11e3a50b3f089aa63e4089bf52 | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 53ccdc73eedaf0e922c45b569b797d2796fbaafa | ≥ bdb6e697b2a76c541960b86ab8fda88f3de1adf2, < 75a2f31520095600f650597c0ac41f48b5ba0068 | 3.3
  • linux_kernel< 4.4.297 | ≥ 4.5, < 4.9.295 | ≥ 4.10, < 4.14.260 | ≥ 4.15, < 4.19.223 | ≥ 4.20, < 5.4.169 | ≥ 5.5, < 5.10.89 | ≥ 5.11, < 5.15.12 | 5.16:rc1 | 5.16:rc2 | 5.16:rc3 | 5.16:rc4 | 5.16:rc5 | 5.16:rc6
Debian1 product
  • linux< 5.15.15-1

3 vendors · 91 products

References

14 links
Show all 14 references