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Fencer Intel
medium 5.5

CVE-2025-71151 json

cifs: Fix memory and information leak in smb3_reconfigure()

published 9mo ago modified 4mo ago also EUVD-2026-4391

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

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

cifs: Fix memory and information leak in smb3_reconfigure()

In smb3_reconfigure(), if smb3_sync_session_ctx_passwords() fails, the function returns immediately without freeing and erasing the newly allocated new_password and new_password2. This causes both a memory leak and a potential information leak.

Fix this by calling kfree_sensitive() on both password buffers before returning in this error case.

Patch / fix

  • Linux Linux 6.6.120, 6.12, 6.12.64, 6.18.3, 6.19
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.3-1

debian advisories DEBIAN-CVE-2025-71151

  • linux Ubuntu 24.04 LTS 6.8.0-110.110
  • linux Ubuntu 25.10 6.17.0-22.22
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-aws Ubuntu 25.10 6.17.0-1012.12
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57
  • linux-gcp Ubuntu 25.10 6.17.0-1012.12
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1050.56
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1051.51

ubuntu advisories UBUNTU-CVE-2025-71151

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

  • kernel RHEL 10.0 6.12.0-55.9.1.el10_0
  • rv RHEL 10.0 6.12.0-55.9.1.el10_0
  • perf RHEL 10.0 6.12.0-55.9.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.9.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.9.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.9.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.9.1.el10_0
  • kernel-core RHEL 10.0 6.12.0-55.9.1.el10_0

red hat advisories RHBA-2025:6279RHSA-2025:6966

Is CVE-2025-71151 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2025-71151 updated cvss 5.5

kernel: cifs: Fix memory and information leak in smb3_reconfigure()

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.12.1.el9_6, perf 5.14.0-570.12.1.el9_6, rtla 5.14.0-570.12.1.el9_6, python3-perf 5.14.0-570.12.1.el9_6, kernel-devel-matched 5.14.0-570.12.1.el9_6, kernel-64k-devel-matched 5.14.0-570.12.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:6966
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.9.1.el10_0, perf 6.12.0-55.9.1.el10_0, rtla 6.12.0-55.9.1.el10_0, python3-perf 6.12.0-55.9.1.el10_0, kernel-devel-matched 6.12.0-55.9.1.el10_0, kernel-64k-devel-matched 6.12.0-55.9.1.el10_0, +7 more
    fixed: vendor fix RHBA-2025:6279
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.12.1.el9_6, kernel-64k 5.14.0-570.12.1.el9_6, kernel-core 5.14.0-570.12.1.el9_6, kernel-tools 5.14.0-570.12.1.el9_6, kernel-modules 5.14.0-570.12.1.el9_6, kernel-64k-core 5.14.0-570.12.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:6966
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.9.1.el10_0, kernel-64k 6.12.0-55.9.1.el10_0, kernel-core 6.12.0-55.9.1.el10_0, kernel-tools 6.12.0-55.9.1.el10_0, kernel-modules 6.12.0-55.9.1.el10_0, kernel-64k-core 6.12.0-55.9.1.el10_0, +27 more
    fixed: vendor fix RHBA-2025:6279
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.12.1.el9_6
    fixed: vendor fix RHSA-2025:6966
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.9.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.9.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.9.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.9.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.9.1.el10_0
    fixed: vendor fix RHBA-2025:6279
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.12.1.el9_6, kernel-rt-64k 5.14.0-570.12.1.el9_6, kernel-rt-core 5.14.0-570.12.1.el9_6, kernel-rt-modules 5.14.0-570.12.1.el9_6, kernel-rt-64k-core 5.14.0-570.12.1.el9_6, kernel-rt-debug-core 5.14.0-570.12.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:6966
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.9.1.el10_0, kernel-rt-64k 6.12.0-55.9.1.el10_0, kernel-rt-core 6.12.0-55.9.1.el10_0, kernel-rt-modules 6.12.0-55.9.1.el10_0, kernel-rt-64k-core 6.12.0-55.9.1.el10_0, kernel-rt-debug-core 6.12.0-55.9.1.el10_0, +14 more
    fixed: vendor fix RHBA-2025:6279
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.12.1.el9_6, kernel-rt-kvm 5.14.0-570.12.1.el9_6, kernel-rt-core 5.14.0-570.12.1.el9_6, kernel-rt-modules 5.14.0-570.12.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.12.1.el9_6, kernel-rt-debug-core 5.14.0-570.12.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:6966
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.9.1.el10_0, kernel-rt-kvm 6.12.0-55.9.1.el10_0, kernel-rt-core 6.12.0-55.9.1.el10_0, kernel-rt-modules 6.12.0-55.9.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.9.1.el10_0, kernel-rt-debug-core 6.12.0-55.9.1.el10_0, +6 more
    fixed: vendor fix RHBA-2025:6279
  • 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
    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

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime
Technology feeds

References

Sources

Fencer Intel 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.