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Fencer Vulns
critical 9.4

CVE-2024-26828 in the critical feed json

cifs: fix underflow in parse_server_interfaces()

published 2024-04-17 2 y ago modified 2026-10-30 10 d ago also EUVD-2024-24090

cvss
9.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

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

cifs: fix underflow in parse_server_interfaces()

In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending.

Patch / fix

  • Linux Linux 5.15.224, 6.1.79, 6.6.18, 6.7.6, 6.8
  • linux Debian 12 6.1.82-1
  • linux Debian 14, Debian 13 6.7.7-1

debian advisories DEBIAN-CVE-2024-26828

  • linux Ubuntu 20.04 LTS 5.4.0-189.209
  • linux Ubuntu 22.04 LTS 5.15.0-116.126
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1128.138
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1065.71
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1132.141
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1064.72
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1062.68
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1075.80

ubuntu advisories UBUNTU-CVE-2024-26828

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 9 5.14.0-427.31.1.el9_4
  • rv RHEL 9 5.14.0-427.31.1.el9_4
  • perf RHEL 9 5.14.0-427.31.1.el9_4
  • rtla RHEL 9 5.14.0-427.31.1.el9_4
  • bpftool RHEL 9 7.3.0-427.31.1.el9_4
  • libperf RHEL 9 5.14.0-427.31.1.el9_4
  • kernel-rt RHEL 9 5.14.0-427.31.1.el9_4
  • kernel-64k RHEL 9 5.14.0-427.31.1.el9_4

red hat advisories RHSA-2024:5363RHSA-2024:3461RHSA-2024:3460

  • kernel-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source Linux Micro 6.0 6.4.0-18.1
  • kernel-default Linux Micro 6.0 6.4.0-18.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1
  • kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
  • kernel-livepatch-SLE15-SP5_Update_10 SLE Live Patching 15 SP5 13-150500.11.8.1
  • kernel-livepatch-SLE15-SP4_Update_26 SLE Live Patching 15 SP4 10-150400.9.6.1

suse advisories SUSE-SU-2025:20028-1SUSE-SU-2025:20008-1SUSE-SU-2025:0266-1SUSE-SU-2025:0264-1SUSE-SU-2025:0261-1SUSE-SU-2025:0254-1

  • kernel AlmaLinux 9 5.14.0-427.31.1.el9_4
  • rv AlmaLinux 9 5.14.0-427.31.1.el9_4
  • perf AlmaLinux 9 5.14.0-427.31.1.el9_4
  • rtla AlmaLinux 9 5.14.0-427.31.1.el9_4
  • bpftool AlmaLinux 9 7.3.0-427.31.1.el9_4
  • libperf AlmaLinux 9 5.14.0-427.31.1.el9_4
  • kernel-rt AlmaLinux 9 5.14.0-427.31.1.el9_4
  • kernel-64k AlmaLinux 9 5.14.0-427.31.1.el9_4

almalinux advisories ALSA-2024:5363

  • kernel Rocky Linux 9 5.14.0-427.31.1.el9_4

rocky linux advisories RLSA-2024:5363

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-2024-26828 updated cvss 6.7

kernel: cifs: fix underflow in parse_server_interfaces()

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more 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.9.2) kernel-debuginfo-common-s390x 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.67.1.el9_2
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.31.1.el9_4, perf 5.14.0-427.31.1.el9_4, rtla 5.14.0-427.31.1.el9_4, kernel-devel-matched 5.14.0-427.31.1.el9_4, kernel-64k-devel-matched 5.14.0-427.31.1.el9_4, kernel-debug-devel-matched 5.14.0-427.31.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:5363
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.67.1.el9_2, rtla 5.14.0-284.67.1.el9_2, kernel-devel-matched 5.14.0-284.67.1.el9_2, kernel-64k-devel-matched 5.14.0-284.67.1.el9_2, kernel-debug-devel-matched 5.14.0-284.67.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.67.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.31.1.el9_4, kernel 5.14.0-427.31.1.el9_4, kernel-64k 5.14.0-427.31.1.el9_4, kernel-core 5.14.0-427.31.1.el9_4, kernel-tools 5.14.0-427.31.1.el9_4, python3-perf 5.14.0-427.31.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:5363
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.67.1.el9_2, kernel 5.14.0-284.67.1.el9_2, kernel-64k 5.14.0-284.67.1.el9_2, kernel-core 5.14.0-284.67.1.el9_2, kernel-tools 5.14.0-284.67.1.el9_2, python3-perf 5.14.0-284.67.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:3461
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.31.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.31.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.31.1.el9_4, kernel-rt-kvm 5.14.0-427.31.1.el9_4, kernel-rt-core 5.14.0-427.31.1.el9_4, kernel-rt-modules 5.14.0-427.31.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.31.1.el9_4, kernel-rt-debug-core 5.14.0-427.31.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:5363
show 3 more
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-modules 5.14.0-284.67.1.rt14.352.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-kvm 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-modules 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-kvm 5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-core 5.14.0-284.67.1.rt14.352.el9_2, +6 more
    fixed: vendor fix RHSA-2024:3460
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.31.1.el9_4, kernel-rt-core 5.14.0-427.31.1.el9_4, kernel-rt-modules 5.14.0-427.31.1.el9_4, kernel-rt-debug-core 5.14.0-427.31.1.el9_4, kernel-rt-modules-core 5.14.0-427.31.1.el9_4, kernel-rt-debug-modules 5.14.0-427.31.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:5363
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux AppStream (v. 9) kernel-headers 5.14.0-427.31.1.el9_4 Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.67.1.el9_2 Red Hat Enterprise Linux CRB (v. 9) kernel-cross-headers 5.14.0-427.31.1.el9_4
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% 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
CISA ADP 3.1 6.7 CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
CNA 3.1 6.7 CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)
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.