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CVE-2023-53751· NVD / CVE Program· CNA Linux

cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname

In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname TCP_Server_Info::hostname may be updated once or many times during reconnect, so protect its access outside reconnect path as well and then prevent any potential use-after-free bugs.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Dec 7, 2025
Updated
Aug 5, 2026
EPSS
0.4% · 33th percentile
CWE
—
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Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.0affected
    • 93d5cb517db39e8af8d1292f9e785e4983b7f708 and later · before 64d62ac6d6514cba1305bd08e271ec1843bdd612affected · git
    • 93d5cb517db39e8af8d1292f9e785e4983b7f708 and later · before c511954bf142fe1995aec3c739a9f1a76990283aaffected · git
    • 93d5cb517db39e8af8d1292f9e785e4983b7f708 and later · before 0b08c4c499200be67d54c439d56e5ea866869945affected · git
    • 93d5cb517db39e8af8d1292f9e785e4983b7f708 and later · before 90c49fce1c43e1cc152695e20363ff5087897c09affected · git
    • before 5.0not affected · semver
    • 6.1.28 and later · up to and including 6.1.*not affected · semver
    • 6.2.15 and later · up to and including 6.2.*not affected · semver
    • 6.3.2 and later · up to and including 6.3.*not affected · semver
    • 6.4 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.37-16.1.37-1
Debian:13linuxbefore 6.3.7-16.3.7-1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-abi-stablelistsbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfobefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-develbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-docbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-modulesbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-modules-extrabefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-toolsbefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10
Red Hat:enterprise_linux:8::baseoskernel-tools-debuginfobefore 0:4.18.0-553.82.1.el8_100:4.18.0-553.82.1.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan
  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan
  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b08c4c499200be67d54c439d56e5ea866869945Vendor (CNA)
Linux Linux64d62ac6d6514cba1305bd08e271ec1843bdd612Vendor (CNA)
Linux Linux90c49fce1c43e1cc152695e20363ff5087897c09Vendor (CNA)
Linux Linuxc511954bf142fe1995aec3c739a9f1a76990283aVendor (CNA)
debian:linux6.1.37-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-553.82.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records