9.8

CVE-2023-52480: ksmbd: fix race condition between session lookup and expire

Modified
AliasesUBUNTU-CVE-2023-52480DEBIAN-CVE-2023-52480
Published 29-02-2024Last modified 15-08-2026

Vulnerability summary

CVE-2023-52480 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.49%
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 2 · Related 2
USN-6725-1USN-6725-2

Timeline

  1. 29-02-2024
    PublishedVulnerability first disclosed.
  2. 15-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.49% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu74 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ a6a9601ba995d0fec635324cb9fd8d14f9bea14e, < c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f | ≥ 1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d, < a2ca5fd3dbcc665e1169044fa0c9e3eba779202b | ≥ ea174a91893956450510945a0c5d1a10b5323656, < 18ced78b0ebccc2d16f426143dc56ab3aad666be | ≥ ea174a91893956450510945a0c5d1a10b5323656, < 53ff5cf89142b978b1a5ca8dc4d4425e6a09745f | 750a2d772e9d9ff377fd32e3b6797bf2cd847a7a | 6775ee7ef4b37c521aa4cf3730f54554c4875542 | ≥ 6.1.29, < 6.1.57 | ≥ 6.2.16, < 6.3 | ≥ 6.3.2, < 6.4 | 6.4
  • linux_kernel≥ 5.15, < 5.15.145 | ≥ 5.16, < 6.1.57 | ≥ 6.2, < 6.5.7 | 6.6:rc1 | 6.6:rc2 | 6.6:rc3 | 6.6:rc4
Debian1 product
  • linux< 6.1.64-1 | < 6.5.8-1

3 vendors · 77 products

References

10 links