CVE-2026-93785: cifs: validate idmap key payload length

Received
AliasesUBUNTU-CVE-2026-93785DEBIAN-CVE-2026-93785
Published 24-09-2026Last modified 03-10-2026

Vulnerability summary

CVE-2026-93785 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.7% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.17%
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 5 · Related 5
OPENSUSE-SU-2026:22167-1SUSE-SU-2026:24386-1SUSE-SU-2026:24422-1SUSE-SU-2026:24437-1SUSE-SU-2026:24446-1

Timeline

  1. 24-09-2026
    PublishedVulnerability first disclosed.
  2. 03-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: validate idmap key payload length The cifs.idmap key type stores its payload length in key->datalen, which is limited to U16_MAX. Accepting a larger key payload truncates the recorded length and can make later users interpret the payload using inconsistent bounds. Reject oversized preparsed payloads before allocating or copying them. This keeps key->datalen consistent with the stored data for both inline and separately allocated idmap payloads.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% 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: not stated in public data.

Ubuntu169 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)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < eeac976b74b4f697cfc517187b7cbfd72652dbbc | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 125b05ac8ca8758950e4369c1542d57a162f504c | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 945f6cde6bcf8f08f6fa5df8882b1b9582e55efa | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 3a4a34a732e8a08309eed0a74314dbd9f2f1c972 | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 6cfeef221ac00d63c07f6122f58e6159bde69ca0 | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 8b12f65d7caf16d124098cb4895a203367d35b57 | ≥ 21fed0d5b763b94a7d1568c27d0cce892ab8d43e, < 455488cd5054bcc59db40fa1cc2c004031a5b2a5 | 3.2

3 vendors · 172 products

References

10 links