7.1

CVE-2026-64379: smb: client: mask server-provided mode to 07777 in modefromsid

Modified
AliasesUBUNTU-CVE-2026-64379DEBIAN-CVE-2026-64379
Published 25-07-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-64379 is a high (CVSS 7.1) Improper Input Validation vulnerability in linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 23.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.31%
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 25 · Related 21
OPENSUSE-SU-2026:11476-1RHSA-2026:57251RHSA-2026:57252RHSA-2026:57253RHSA-2026:57254USN-8726-1

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.31% 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, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu165 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux2 products
  • linux≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < ee2216dbdf0c677e89bb43e03247dba590ed00ef | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < f511807feee7cb29b61bdfa86472c7e9e2e5df94 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 08c600b7e1818539ba5efee4cdb06215c245ca78 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < c6c484a7d5bff6b929a86d7ed5130f29834c6a0d | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < f80add1bfb3425100a325b14f19648e75669a954 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 | 5.4
  • linux_kernel≥ 5.4, < 5.10.261 | ≥ 5.11, < 5.15.212 | ≥ 5.16, < 6.1.178 | ≥ 6.2, < 6.6.145 | ≥ 6.7, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4 | 7.2:rc1 | 7.2:rc2

3 vendors · 169 products

References

33 links
Show all 33 references