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Fencer Vulns
critical 9.8

CVE-2023-52480 in the critical feed json

ksmbd: fix race condition between session lookup and expire

published 2024-02-29 2 y ago modified 2026-08-15 2 mo ago also EUVD-2023-57105

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 42%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix race condition between session lookup and expire

Thread A + Thread B ksmbd_session_lookup | smb2_sess_setup sess = xa_load | | | xa_erase(&conn->sessions, sess->id); | | ksmbd_session_destroy(sess) --> kfree(sess) | // UAF! | sess->last_active = jiffies | +

This patch add rwsem to fix race condition between ksmbd_session_lookup and ksmbd_expire_session.

Patch / fix

  • Linux Linux 6.1.57, 6.3, 6.4, 6.5.7, 6.6
  • linux Debian 12 6.1.64-1
  • linux Debian 14, Debian 13 6.5.8-1

debian advisories DEBIAN-CVE-2023-52480

  • linux-raspi Ubuntu 24.04 LTS 6.7.0-1001.1
  • linux-gcp-6.5 Ubuntu 22.04 LTS 6.5.0-1013.13~22.04.1
  • linux-hwe-6.5 Ubuntu 22.04 LTS 6.5.0-17.17~22.04.1
  • linux-oem-6.5 Ubuntu 22.04 LTS 6.5.0-1014.15
  • linux-nvidia-6.5 Ubuntu 22.04 LTS 6.5.0-1014.14
  • linux-oracle-6.5 Ubuntu 22.04 LTS 6.5.0-1015.15~22.04.1
  • linux-lowlatency-hwe-6.5 Ubuntu 22.04 LTS 6.5.0-17.17.1.1.1~22.04.1

ubuntu advisories UBUNTU-CVE-2023-52480

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-52480 updated cvss 7.1

kernel: ksmbd: fix race condition between session lookup and expire

  • 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 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
    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
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% 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
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.