5.5

CVE-2023-53273: Drivers: vmbus: Check for channel allocation before looking up relids

Modified
AliasesUBUNTU-CVE-2023-53273DEBIAN-CVE-2023-53273
Published 16-09-2025Last modified 11-05-2026

Vulnerability summary

CVE-2023-53273 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5% 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 (CVE.org)
EPSS score
0.16%
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 8 · Related 6
RHSA-2023:2458RHSA-2023:2951SUSE-SU-2025:03613-1SUSE-SU-2025:03615-1SUSE-SU-2025:03626-1SUSE-SU-2025:03628-1

Timeline

  1. 16-09-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: Drivers: vmbus: Check for channel allocation before looking up relids relid2channel() assumes vmbus channel array to be allocated when called. However, in cases such as kdump/kexec, not all relids will be reset by the host. When the second kernel boots and if the guest receives a vmbus interrupt during vmbus driver initialization before vmbus_connect() is called, before it finishes, or if it fails, the vmbus interrupt service routine is called which in turn calls relid2channel() and can cause a null pointer dereference. Print a warning and error out in relid2channel() for a channel id that's invalid in the second kernel.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.15% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu110 products
  • linux< 5.15.0-79.86
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1042.47
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 8b6a877c060ed6b86878fe66c7c6493a6054cf23, < 176c6b4889195fbe7016d9401175b48c5c9edf68 | ≥ 8b6a877c060ed6b86878fe66c7c6493a6054cf23, < c373e49fbb87aa177819866ed9194ebc5414dfd6 | ≥ 8b6a877c060ed6b86878fe66c7c6493a6054cf23, < 8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee | ≥ 8b6a877c060ed6b86878fe66c7c6493a6054cf23, < a5c44f3446a0565139b7d8abc78f58b86c398123 | ≥ 8b6a877c060ed6b86878fe66c7c6493a6054cf23, < 1eb65c8687316c65140b48fad27133d583178e15 | 5.8
  • linux_kernel≥ 5.8, < 5.10.178 | ≥ 5.11, < 5.15.107 | ≥ 5.16, < 6.1.24 | ≥ 6.2, < 6.2.11 | 6.3:rc1 | 6.3:rc2 | 6.3:rc3 | 6.3:rc4 | 6.3:rc5
Debian1 product
  • linux< 6.1.25-1

3 vendors · 113 products

References

9 links