Home/CVE/An issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5. There is an integer signedness erro
CVE

CVE-2023-44466

An issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5. There is an integer signedness erro

An issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5. There is an integer signedness error, leading to a buffer overflow and remote code execution via HELLO or one of the AUTH frames. This occurs because of an untrusted length taken from a TCP packet in ceph_decode_32.

HIGH · CVSS 8.8 EPSS 0.54577
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
Look this up elsewhere - one-click external pivots
NVDCVE.orgCISAVulnersExploit-DBGitHub PoCVulnCheck KEVGreyNoise
▸ How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2023-44466, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
◆

ATT&CK techniques

1

Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.

T1078 · Valid Accounts
▤ Build a SIEM detection for these techniques
▤

CAPEC attack patterns

12

Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.

CAPEC-CAPEC-10 · Buffer Overflow via Environment Variables CAPEC-CAPEC-100 · Overflow Buffers CAPEC-CAPEC-14 · Client-side Injection-induced Buffer Overflow CAPEC-CAPEC-24 · Filter Failure through Buffer Overflow CAPEC-CAPEC-42 · MIME Conversion CAPEC-CAPEC-44 · Overflow Binary Resource File CAPEC-CAPEC-45 · Buffer Overflow via Symbolic Links CAPEC-CAPEC-46 · Overflow Variables and Tags CAPEC-CAPEC-47 · Buffer Overflow via Parameter Expansion CAPEC-CAPEC-67 · String Format Overflow in syslog() CAPEC-CAPEC-8 · Buffer Overflow in an API Call CAPEC-CAPEC-9 · Buffer Overflow in Local Command-Line Utilities
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
▤

Affected Products & Versions

3
linux kernel>= 5.11 and < 5.15.121
linux kernel>= 5.16 and < 6.1.40
linux kernel>= 6.2 and < 6.4.5
▤

Affected Packages

38
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Ubuntu:14.04:LTS linux fixed in 3.11.0-12.19
Ubuntu:14.04:LTS linux-aws fixed in 4.4.0-1002.2
Ubuntu:14.04:LTS linux-azure fixed in 4.15.0-1023.24~14.04.1
Ubuntu:14.04:LTS linux-lts-xenial fixed in 4.4.0-13.29~14.04.1
Ubuntu:16.04:LTS linux fixed in 4.4.0-2.16
Ubuntu:16.04:LTS linux-aws fixed in 4.4.0-1001.10
Ubuntu:16.04:LTS linux-aws-hwe fixed in 4.15.0-1030.31~16.04.1
Ubuntu:16.04:LTS linux-azure fixed in 4.11.0-1009.9
Ubuntu:16.04:LTS linux-gcp fixed in 4.10.0-1004.4
Ubuntu:16.04:LTS linux-hwe fixed in 4.8.0-39.42~16.04.1
Ubuntu:16.04:LTS linux-kvm fixed in 4.4.0-1004.9
Ubuntu:16.04:LTS linux-oracle fixed in 4.15.0-1007.9~16.04.1
Ubuntu:18.04:LTS linux fixed in 4.13.0-16.19
Ubuntu:18.04:LTS linux-aws fixed in 4.15.0-1001.1
Ubuntu:18.04:LTS linux-aws-5.4 fixed in 5.4.0-1018.18~18.04.1
Ubuntu:18.04:LTS linux-azure-4.15 fixed in 4.15.0-1082.92
Ubuntu:18.04:LTS linux-azure-5.4 fixed in 5.4.0-1020.20~18.04.1
Ubuntu:18.04:LTS linux-gcp-4.15 fixed in 4.15.0-1071.81
Ubuntu:18.04:LTS linux-gcp-5.4 fixed in 5.4.0-1019.19~18.04.2
Ubuntu:18.04:LTS linux-hwe-5.4 fixed in 5.4.0-37.41~18.04.1
Ubuntu:18.04:LTS linux-hwe-edge fixed in 5.0.0-15.16~18.04.1
Ubuntu:18.04:LTS linux-ibm-5.4 fixed in 5.4.0-1010.11~18.04.2
Ubuntu:18.04:LTS linux-kvm fixed in 4.15.0-1002.2
Ubuntu:18.04:LTS linux-oem-osp1 fixed in 5.0.0-1010.11
Ubuntu:18.04:LTS linux-oracle fixed in 4.15.0-1007.9
Ubuntu:18.04:LTS linux-oracle-5.4 fixed in 5.4.0-1019.19~18.04.1
Ubuntu:18.04:LTS linux-raspi-5.4 fixed in 5.4.0-1013.13~18.04.1
Ubuntu:20.04:LTS linux fixed in 5.4.0-9.12
Ubuntu:20.04:LTS linux-aws fixed in 5.4.0-1005.5
Ubuntu:20.04:LTS linux-aws-5.11
Ubuntu:20.04:LTS linux-aws-5.13
Ubuntu:20.04:LTS linux-aws-5.15 fixed in 5.15.0-1047.52~20.04.1
Ubuntu:20.04:LTS linux-aws-5.8
Ubuntu:20.04:LTS linux-azure fixed in 5.4.0-1006.6
Ubuntu:20.04:LTS linux-azure-5.11
Ubuntu:20.04:LTS linux-azure-5.13
Ubuntu:20.04:LTS linux-azure-5.15 fixed in 5.15.0-1049.56~20.04.1
Ubuntu:20.04:LTS linux-azure-5.8
⚠

Public Exploits & PoCs

5
These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted.
pocPublic PoC (nvd-reference)
pocgoogle/security-research (trickest)
pocchenghungpan/test_data (trickest)
pocfkie-cad/nvd-json-data-feeds (trickest)
pocgithub.com · GHSA-jg27-jx6w-xwphgithub.com
📦

Fixed versions by distribution

79
The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
rhel 8bpftool fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-abi-stablelists fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-core fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-debug fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-debug-core fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-debug-devel open
rhel 8kernel-debug-modules fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-debug-modules-extra fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-devel fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-modules fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-modules-extra fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-tools fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-tools-libs open
rhel 8kernel-tools-libs-devel open
rhel 8kernel-zfcpdump fixed in 0:4.18.0-477.27.1.el8_8
rhel 8kernel-zfcpdump-core open
rhel 8kernel-zfcpdump-devel open
rhel 8kernel-zfcpdump-modules open
rhel 8kernel-zfcpdump-modules-extra open
rhel 8perf fixed in 0:4.18.0-477.27.1.el8_8
rhel 8python3-perf open
rhel 9bpftool fixed in 0:7.0.0-284.30.1.el9_2
rhel 9kernel fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-core fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-debug fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-debug-core fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-debug-devel open
rhel 9kernel-64k-debug-devel-matched fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-debug-modules open
rhel 9kernel-64k-debug-modules-core fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-debug-modules-extra fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-devel open
rhel 9kernel-64k-devel-matched open
rhel 9kernel-64k-modules fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-64k-modules-core open
rhel 9kernel-64k-modules-extra open
rhel 9kernel-abi-stablelists fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-core open
rhel 9kernel-debug fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-debug-core open
rhel 9kernel-debug-devel fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-debug-devel-matched open
rhel 9kernel-debug-modules fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-debug-modules-core open
rhel 9kernel-debug-modules-extra fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-debug-uki-virt fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-devel open
rhel 9kernel-devel-matched open
rhel 9kernel-modules open
rhel 9kernel-modules-core fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-modules-extra open
rhel 9kernel-tools fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-tools-libs fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-tools-libs-devel open
rhel 9kernel-uki-virt fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-zfcpdump open
rhel 9kernel-zfcpdump-core open
rhel 9kernel-zfcpdump-devel fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-zfcpdump-devel-matched open
rhel 9kernel-zfcpdump-modules fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-zfcpdump-modules-core fixed in 0:5.14.0-284.30.1.el9_2
rhel 9kernel-zfcpdump-modules-extra open
rhel 9perf open
rhel 9python3-perf fixed in 0:5.14.0-284.30.1.el9_2
rhel 9rtla open
suse sle15kernel-default open
suse sle15kernel-default-base open
suse sle15kernel-default-devel open
suse sle15kernel-default-man open
suse sle15kernel-devel open
suse sle15kernel-devel-azure open
suse sle15kernel-devel-rt open
suse sle15kernel-macros open
suse sle15kernel-source open
suse sle15kernel-source-azure open
suse sle15kernel-source-rt open
suse sle15reiserfs-kmp-default open
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · [email protected]
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD29 Sep 2023 · 06:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

14
rhsaRHSA-2023:5069Low
rhsaRHSA-2023:4789Low
usnUSN-6520-1
usnUSN-6466-1
usnUSN-6464-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a282a2f10539dce2aa619e71e1817570d557fc97Mailing ListPatch
https://github.com/torvalds/linux/commit/a282a2f10539dce2aa619e71e1817570d557fc97Patch
https://security.netapp.com/advisory/ntap-20231116-0003/Third Party Advisory
https://www.spinics.net/lists/ceph-devel/msg57909.htmlMailing ListPatch
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