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Fencer Vulns
critical 9.4

CVE-2025-39933 in the critical feed json

smb: client: let recv_done verify data_offset, data_length and remaining_data_length

published 2025-10-04 13 mo ago modified 2026-10-30 10 d ago also EUVD-2025-32405

cvss
9.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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

smb: client: let recv_done verify data_offset, data_length and remaining_data_length

This is inspired by the related server fixes.

Patch / fix

  • Linux Linux 6.1.191, 6.6.160, 6.12.114, 6.16.9, 6.17
  • linux Debian 13 6.12.115-2
  • linux Debian 14 6.16.9-1

debian advisories DEBIAN-CVE-2025-39933

  • linux-nvidia-tegra Ubuntu 24.04 LTS 6.8.0-1035.38

ubuntu advisories UBUNTU-CVE-2025-39933

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 10.1 6.12.0-124.35.1.el10_1
  • rv RHEL 10.1 6.12.0-124.35.1.el10_1
  • perf RHEL 10.1 6.12.0-124.35.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.35.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.35.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.35.1.el10_1

red hat advisories RHSA-2026:3375RHSA-2026:3360RHSA-2026:3358RHSA-2026:3293RHSA-2026:3277RHSA-2026:3268

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.35.1.el10_1
  • kernel AlmaLinux 8 4.18.0-553.94.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.94.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.94.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.94.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.94.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.94.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.94.1.el8_10

almalinux advisories ALSA-2026:2282ALSA-2026:0759ALSA-2026:0760ALSA-2026:0793

  • kernel Rocky Linux 10 6.12.0-124.35.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.24.1.el9_7
  • kernel-rt Rocky Linux 8 4.18.0-553.94.1.rt7.435.el8_10
  • kernel Rocky Linux 8 4.18.0-553.94.1.el8_10

rocky linux advisories RLSA-2026:2282RLSA-2026:0793RLSA-2026:0760RLSA-2026:0759

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-2025-39933 updated cvss 7.1

kernel: smb: client: let recv_done verify data_offset, data_length and remaining_data_length

  • 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 CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.111.1.el9_4
    fixed: vendor fix RHSA-2026:2766
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.89.1.el9_6
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.24.1.el9_7, perf 5.14.0-611.24.1.el9_7, rtla 5.14.0-611.24.1.el9_7, python3-perf 5.14.0-611.24.1.el9_7, kernel-devel-matched 5.14.0-611.24.1.el9_7, kernel-64k-devel-matched 5.14.0-611.24.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:0793
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.35.1.el10_1, perf 6.12.0-124.35.1.el10_1, rtla 6.12.0-124.35.1.el10_1, python3-perf 6.12.0-124.35.1.el10_1, kernel-devel-matched 6.12.0-124.35.1.el10_1, kernel-64k-devel-matched 6.12.0-124.35.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.167.1.el9_0, kernel-devel-matched 5.14.0-70.167.1.el9_0, kernel-debug-devel-matched 5.14.0-70.167.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.167.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.167.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.167.1.el9_0, +2 more
    fixed: vendor fix RHSA-2026:3293
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.158.1.el9_2, rtla 5.14.0-284.158.1.el9_2, kernel-devel-matched 5.14.0-284.158.1.el9_2, kernel-64k-devel-matched 5.14.0-284.158.1.el9_2, kernel-debug-devel-matched 5.14.0-284.158.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.158.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.58.1.el10_0, perf 6.12.0-55.58.1.el10_0, rtla 6.12.0-55.58.1.el10_0, python3-perf 6.12.0-55.58.1.el10_0, kernel-devel-matched 6.12.0-55.58.1.el10_0, kernel-64k-devel-matched 6.12.0-55.58.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:1727
show 31 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.111.1.el9_4, perf 5.14.0-427.111.1.el9_4, rtla 5.14.0-427.111.1.el9_4, kernel-devel-matched 5.14.0-427.111.1.el9_4, kernel-64k-devel-matched 5.14.0-427.111.1.el9_4, kernel-debug-devel-matched 5.14.0-427.111.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.89.1.el9_6, perf 5.14.0-570.89.1.el9_6, rtla 5.14.0-570.89.1.el9_6, python3-perf 5.14.0-570.89.1.el9_6, kernel-devel-matched 5.14.0-570.89.1.el9_6, kernel-64k-devel-matched 5.14.0-570.89.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.94.1.el8_10, kernel 4.18.0-553.94.1.el8_10, bpftool 4.18.0-553.94.1.el8_10, kernel-core 4.18.0-553.94.1.el8_10, kernel-tools 4.18.0-553.94.1.el8_10, python3-perf 4.18.0-553.94.1.el8_10, +11 more
    fixed: vendor fix RHSA-2026:0759
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.24.1.el9_7, kernel-64k 5.14.0-611.24.1.el9_7, kernel-core 5.14.0-611.24.1.el9_7, kernel-tools 5.14.0-611.24.1.el9_7, kernel-modules 5.14.0-611.24.1.el9_7, kernel-64k-core 5.14.0-611.24.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:0793
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.35.1.el10_1, kernel-64k 6.12.0-124.35.1.el10_1, kernel-core 6.12.0-124.35.1.el10_1, kernel-tools 6.12.0-124.35.1.el10_1, kernel-modules 6.12.0-124.35.1.el10_1, kernel-64k-core 6.12.0-124.35.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:3268
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.167.1.el9_0, bpftool 5.14.0-70.167.1.el9_0, kernel-core 5.14.0-70.167.1.el9_0, kernel-tools 5.14.0-70.167.1.el9_0, python3-perf 5.14.0-70.167.1.el9_0, kernel-modules 5.14.0-70.167.1.el9_0, +14 more
    fixed: vendor fix RHSA-2026:3293
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.158.1.el9_2, kernel 5.14.0-284.158.1.el9_2, kernel-64k 5.14.0-284.158.1.el9_2, kernel-core 5.14.0-284.158.1.el9_2, kernel-tools 5.14.0-284.158.1.el9_2, python3-perf 5.14.0-284.158.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.58.1.el10_0, kernel-64k 6.12.0-55.58.1.el10_0, kernel-core 6.12.0-55.58.1.el10_0, kernel-tools 6.12.0-55.58.1.el10_0, kernel-modules 6.12.0-55.58.1.el10_0, kernel-64k-core 6.12.0-55.58.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.111.1.el9_4, kernel 5.14.0-427.111.1.el9_4, kernel-64k 5.14.0-427.111.1.el9_4, kernel-core 5.14.0-427.111.1.el9_4, kernel-tools 5.14.0-427.111.1.el9_4, python3-perf 5.14.0-427.111.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.89.1.el9_6, kernel-64k 5.14.0-570.89.1.el9_6, kernel-core 5.14.0-570.89.1.el9_6, kernel-tools 5.14.0-570.89.1.el9_6, kernel-modules 5.14.0-570.89.1.el9_6, kernel-64k-core 5.14.0-570.89.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:3268
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.24.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.24.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.24.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.24.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.24.1.el9_7
    fixed: vendor fix RHSA-2026:0793
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.35.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.35.1.el10_1
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.58.1.el10_0
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel 4.18.0-553.94.1.el8_10
    fixed: vendor fix RHSA-2026:0759
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.94.1.rt7.435.el8_10, kernel-rt-kvm 4.18.0-553.94.1.rt7.435.el8_10, kernel-rt-core 4.18.0-553.94.1.rt7.435.el8_10, kernel-rt-modules 4.18.0-553.94.1.rt7.435.el8_10, kernel-rt-debug-kvm 4.18.0-553.94.1.rt7.435.el8_10, kernel-rt-debug-core 4.18.0-553.94.1.rt7.435.el8_10, +3 more
    fixed: vendor fix RHSA-2026:0760
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-kvm 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-kvm 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-core 5.14.0-70.167.1.rt21.239.el9_0, +4 more
    fixed: vendor fix RHSA-2026:3375
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.24.1.el9_7, kernel-rt-64k 5.14.0-611.24.1.el9_7, kernel-rt-core 5.14.0-611.24.1.el9_7, kernel-rt-modules 5.14.0-611.24.1.el9_7, kernel-rt-64k-core 5.14.0-611.24.1.el9_7, kernel-rt-debug-core 5.14.0-611.24.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:0793
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.35.1.el10_1, kernel-rt-64k 6.12.0-124.35.1.el10_1, kernel-rt-core 6.12.0-124.35.1.el10_1, kernel-rt-modules 6.12.0-124.35.1.el10_1, kernel-rt-64k-core 6.12.0-124.35.1.el10_1, kernel-rt-debug-core 6.12.0-124.35.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:2282
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules-extra 5.14.0-70.167.1.rt21.239.el9_0, +2 more
    fixed: vendor fix RHSA-2026:3375
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-modules 5.14.0-284.158.1.rt14.443.el9_2, +4 more
    fixed: vendor fix RHSA-2026:3358
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.58.1.el10_0, kernel-rt-64k 6.12.0-55.58.1.el10_0, kernel-rt-core 6.12.0-55.58.1.el10_0, kernel-rt-modules 6.12.0-55.58.1.el10_0, kernel-rt-64k-core 6.12.0-55.58.1.el10_0, kernel-rt-debug-core 6.12.0-55.58.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.111.1.el9_4, kernel-rt-core 5.14.0-427.111.1.el9_4, kernel-rt-modules 5.14.0-427.111.1.el9_4, kernel-rt-debug-core 5.14.0-427.111.1.el9_4, kernel-rt-modules-core 5.14.0-427.111.1.el9_4, kernel-rt-debug-modules 5.14.0-427.111.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.89.1.el9_6, kernel-rt-64k 5.14.0-570.89.1.el9_6, kernel-rt-core 5.14.0-570.89.1.el9_6, kernel-rt-modules 5.14.0-570.89.1.el9_6, kernel-rt-64k-core 5.14.0-570.89.1.el9_6, kernel-rt-debug-core 5.14.0-570.89.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.24.1.el9_7, kernel-rt-core 5.14.0-611.24.1.el9_7, kernel-rt-modules 5.14.0-611.24.1.el9_7, kernel-rt-debug-core 5.14.0-611.24.1.el9_7, kernel-rt-modules-core 5.14.0-611.24.1.el9_7, kernel-rt-debug-modules 5.14.0-611.24.1.el9_7, +4 more
    fixed: vendor fix RHSA-2026:0793
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.35.1.el10_1, kernel-rt-core 6.12.0-124.35.1.el10_1, kernel-rt-modules 6.12.0-124.35.1.el10_1, kernel-rt-debug-core 6.12.0-124.35.1.el10_1, kernel-rt-modules-core 6.12.0-124.35.1.el10_1, kernel-rt-debug-modules 6.12.0-124.35.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:2282

5 more fixed, 6 more not affected in the full advisory

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns 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.