8.2

CVE-2026-31476: linux

CVSS: 8.2v3.1HighModified
AliasesUBUNTU-CVE-2026-31476DEBIAN-CVE-2026-31476
Published 22-04-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-31476 is a high (CVSS 8.2) vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 27
LSN-0122-1MGASA-2026-0108MGASA-2026-0110USN-8567-1USN-8574-1USN-8574-2

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

+0.21 pp

From 0.50% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 4642ea35c03cf3d3558c009df4757cdb7af3f82d | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < f5300690c23c5ac860499bb37dbc09cf43fd62e6 | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 6fafc4c4238e538969f1375f9ecdc6587c53f1cc | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 1d1888b4a7aec518b707f6eca0bf08992c0e8da3 | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < a897064a457056acb976e20e3007cdf553de340f | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < e0e5edc81b241c70355217de7e120c97c3429deb | ≥ f5a544e3bab78142207e0242d22442db85ba1eff, < 9bbb19d21ded7d78645506f20d8c44895e3d0fb9 | 5.15
  • linux_kernel≥ 5.15.1, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 5.15 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1

3 vendors · 148 products

References

39 links
Show all 39 references