9.8

CVE-2023-53794: cifs: fix session state check in reconnect to avoid use-after-free issue

Deferred
AliasesUBUNTU-CVE-2023-53794DEBIAN-CVE-2023-53794
Published 09-12-2025Last modified 15-10-2026

Vulnerability summary

CVE-2023-53794 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.6% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.51%
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 25 · Related 25
SUSE-SU-2026:0263-1SUSE-SU-2026:0278-1SUSE-SU-2026:0281-1SUSE-SU-2026:0293-1SUSE-SU-2026:0315-1SUSE-SU-2026:0317-1

Timeline

  1. 09-12-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: fix session state check in reconnect to avoid use-after-free issue Don't collect exiting session in smb2_reconnect_server(), because it will be released soon. Note that the exiting session will stay in server->smb_ses_list until it complete the cifs_free_ipc() and logoff() and then delete itself from the list.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.51% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu125 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.52-1 | < 6.4.13-1
Linux1 product
  • linux≥ 4fcd1813e6404dd4420c7d12fb483f9320f0bf93, < 7e4f5c3f01fb0e51ca438e43262d858daf9a0a76 | ≥ 4fcd1813e6404dd4420c7d12fb483f9320f0bf93, < 759ffc164d95a32c09528766d74d9b4fb054e8f4 | ≥ 4fcd1813e6404dd4420c7d12fb483f9320f0bf93, < 99f280700b4cc02d5f141b8d15f8e9fad0418f65 | 655e0c067f0e02ece03fd0591dabe3db2ae27552 | 875cc09c0767a4ac06b57af383709657f98b3ea1 | 599fe1409085059ba12a2c3897c853be9fa9e7cf | 2e4378ee60049b752c9dce16f62ce6fbd11b379a | 59b520454b323ec43b2ae757217332cea33091e0 | e20c888e2b3576e5f498c167729d274ef60b86f8 | 4ce7aa4e44d88ce64ea8ae2337b8910f3670b0ba | 419fad68e4c4135ff9859e9214dd6cf954413ca1 | ≥ 3.10.103, < 3.11 | ≥ 3.12.63, < 3.13 | ≥ 3.14.74, < 3.15 | ≥ 3.16.37, < 3.17 | ≥ 3.18.37, < 3.19 | ≥ 4.1.28, < 4.2 | ≥ 4.4.16, < 4.5 | ≥ 4.6.5, < 4.7 | 4.7

3 vendors · 127 products

References

7 links