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Fencer Vulns
critical 9.8

CVE-2023-53794 in the critical feed json

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

published 2025-12-09 11 mo ago modified 2026-10-15 24 d ago also EUVD-2023-60112

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 3.11, 3.13, 3.15, 3.17, 3.19, 4.2, 4.5, 4.7, 6.1.47, 6.4.12, 6.5
  • linux Debian 12 6.1.52-1
  • linux Debian 14, Debian 13 6.4.13-1

debian advisories DEBIAN-CVE-2023-53794

  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
  • kernel-rt SLE Micro 5.2 5.3.18-150300.238.1
  • kernel-source-rt SLE Micro 5.2 5.3.18-150300.238.1
  • kernel-default SLE Micro 5.2 5.3.18-150300.59.238.1
  • kernel-default-base SLE Micro 5.2 5.3.18-150300.59.238.1.150300.18.142.1
  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.194.1
  • kernel-syms SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.194.1

suse advisories SUSE-SU-2026:1305-1SUSE-SU-2026:1304-1SUSE-SU-2026:1298-1SUSE-SU-2026:1297-1SUSE-SU-2026:1294-1SUSE-SU-2026:1293-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-53794 updated cvss 4.7

kernel: cifs: fix session state check in reconnect to avoid use-after-free issue

  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    affected: no fix available
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.