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NVD / CVE Program· CNA mitre

CVE-2023-35788: An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7.

HighCVSS 7.8 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.52% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: CBL Mariner 1.0 ARM 5.10.185.1-1; CBL Mariner 1.0 x64 5.10.185.1-1; CBL Mariner 2.0 ARM 5.15.116.1-2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to CBL Mariner 1.0 ARM 5.10.185.1-1; CBL Mariner 1.0 x64 5.10.185.1-1; CBL Mariner 2.0 ARM 5.15.116.1-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

Published
Jun 16, 2023
Updated
Sep 18, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux
netapph300s
netapph300s firmware
netapph500s
netapph500s firmware
netapph700s
netapph700s firmware
netapph410s
netapph410s firmware
netapph410c
netapph410c firmware

and 1 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • canonical ubuntu linux22.04
  • debian debian linux10.0
  • debian debian linux11.0
  • debian debian linux12.0
+11 more rows
  • linux linux kernel4.19 and later · before 4.19.285
  • linux linux kernel4.20 and later · before 5.4.246
  • linux linux kernel5.5 and later · before 5.10.183
  • linux linux kernel5.11 and later · before 5.15.116
  • linux linux kernel5.16 and later · before 6.1.33
  • linux linux kernel6.2 and later · before 6.3.7
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700s firmwareall versions

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernelbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-corebefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-cross-headersbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-debugbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-debug-corebefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-debug-develbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-develbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-docbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-headersbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-modulesbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-modules-extrabefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-toolsbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-tools-libsbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-zfcpdumpbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-zfcpdump-corebefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-zfcpdump-develbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-zfcpdump-modulesbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8kernel-zfcpdump-modules-extrabefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8
AlmaLinux:8perfbefore 4.18.0-477.27.2.el8_84.18.0-477.27.2.el8_8

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-3161Jun 12, 2023 · A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel.
    22Monitor
  • ← EarlierCVE-2023-3159Jun 12, 2023 · A use after free issue was discovered in driver/firewire in outbound_phy_packet_callback in the Linux Kernel.
    26Monitor
  • Later →CVE-2023-3268Jun 16, 2023 · An out of bounds (OOB) memory access flaw was found in the Linux kernel in relay_file_read_start_pos in kernel/relay.c in the relayfs.
    28Monitor

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
CBL Mariner 1.0 ARM5.10.185.1-1 · kernelMicrosoft (MSRC)
CBL Mariner 1.0 x645.10.185.1-1 · kernelMicrosoft (MSRC)
CBL Mariner 2.0 ARM5.15.116.1-2 · kernelMicrosoft (MSRC)
CBL Mariner 2.0 x645.15.116.1-2 · kernelMicrosoft (MSRC)
almalinux:bpftool7.0.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-284.25.1.el9_2 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.37-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch645.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-64kb5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-debug5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-default5.14.21-150400.24.69.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-default-base5.14.21-150400.24.69.1.150400.24.31.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-docs5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-kvmsmall5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-obs-build5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-obs-qa5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-source5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-syms5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-zfcpdump5.14.21-150400.24.69.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.25.1.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+26

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02023-06-29

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.

  1. Published
  2. First PoC+12 d
  3. TodayNov 12, 2026+1245 d

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-primary

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.

References

Show all references (6 more)

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

All records