5.5

CVE-2026-53252: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-53252DEBIAN-CVE-2026-53252CGA-3qf6-9h94-jpm8
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-53252 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.3% 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
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 37
MGASA-2026-0312OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

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

Ubuntu156 products
  • linux< 5.15.0-198.208 | < 6.8.0-146.146 | All versions (No fix recorded) | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1117.124 | < 6.8.0-1066.69 | All versions (No fix recorded) | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
  • linux-azure-6.18< 6.18.38-r0
  • linux-gcp-6.18< 6.18.38-r0
  • linux-gcp-6.18-bootc-boot-installed< 6.18.38-r0
  • linux-qemu-6.18< 6.18.38-r0
  • linux-qemu-6.18-bootc-boot-installed< 6.18.38-r0
Linux2 products
  • linux≥ 90dee0a0ff84fac8accd5be98412b3819f667149, < 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd | ≥ c56b177efce8b62798e4d96bdb9867106cb7c4a0, < c016118b9e51eeaf5bc93850d4c455a3b583c0aa | ≥ bc0819a25e04cd68ef3568cfa51b63118fea39a7, < 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 | ≥ ce23b73f0f27e2dbeb81734a79db710f05aa33c6, < bc2efe73c194a74839d7cf57b63880d97e21d309 | ≥ 1d6123102e9fbedc8d25bf4731da6d513173e49e, < ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 | ≥ 1d6123102e9fbedc8d25bf4731da6d513173e49e, < f82799407a50af7bcacacf09cc9b279af8fe9b81 | ≥ 1d6123102e9fbedc8d25bf4731da6d513173e49e, < 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f | dd4becd3fd4102696e1c15e6d260a1712a2d8685 | 0e5c144c557df910ab64d9c25d06399a9a735e65 | ≥ 5.15.209, < 5.15.210 | ≥ 6.1.167, < 6.1.176 | ≥ 6.6.97, < 6.6.143 | ≥ 6.12.36, < 6.12.94 | ≥ 5.10.259, < 5.11 | ≥ 6.15.5, < 6.16 | 6.16
  • linux_kernelEOL≥ 5.10.259, < 5.11 | ≥ 6.1.167, < 6.1.176 | ≥ 6.6.97, < 6.6.143 | ≥ 6.12.36, < 6.12.94 | ≥ 6.15.5, < 6.16 | ≥ 6.16.1, < 6.18.36 | ≥ 6.19, < 7.0.13 | 5.15.209 | 6.16 | 6.16:rc4 | 6.16:rc5 | 6.16:rc6 | 6.16:rc7 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1

4 vendors · 165 products

References

35 links
Show all 35 references