7.8

CVE-2023-53373: crypto: seqiv - Handle EBUSY correctly

Modified
AliasesUBUNTU-CVE-2023-53373DEBIAN-CVE-2023-53373
Published 18-09-2025Last modified 05-08-2026

Vulnerability summary

CVE-2023-53373 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
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 20 · Related 5
RHSA-2025:17760RHSA-2025:18297RHSA-2025:18298RHSA-2025:19104RHSA-2025:19268RHSA-2025:19492

Timeline

  1. 18-09-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: seqiv - Handle EBUSY correctly As it is seqiv only handles the special return value of EINPROGERSS, which means that in all other cases it will free data related to the request. However, as the caller of seqiv may specify MAY_BACKLOG, we also need to expect EBUSY and treat it in the same way. Otherwise backlogged requests will trigger a use-after-free.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% 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.

Ubuntu121 products
  • linuxAll versions (No fix recorded) | < 5.4.0-152.169 | < 5.15.0-75.82
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1104.112 | < 5.15.0-1038.43
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < cc4d0d4251748a8a68026938f4055d2ac47c5719 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 1effbddaff60eeef8017c6dea1ee0ed970164d14 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 63551e4b7cbcd9914258827699eb2cb6ed6e4a16 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < ae849d2f48019ff9c104e32bf588ccbfb200e971 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 36ec108b7bd7e280edb22de028467bd09d644620 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 4d497e8b200a175094e0ac252ed878add39b8771 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 9477db935eb690f697d9bcc4f608927841bc8b36 | ≥ 0a270321dbf948963aeb0e8382fe17d2c2eb3771, < 32e62025e5e52fbe4812ef044759de7010b15dbc | 2.6.25
  • linux_kernel≥ 2.6.25, < 4.14.308 | ≥ 4.15, < 4.19.276 | ≥ 4.20, < 5.4.235 | ≥ 5.5, < 5.10.173 | ≥ 5.11, < 5.15.99 | ≥ 5.16, < 6.1.16 | ≥ 6.2, < 6.2.3
Debian1 product
  • linux< 6.1.20-1

3 vendors · 124 products

References

12 links
Show all 12 references