CVE-2023-3611: Out-of-bounds write in Linux kernel's net/sched: sch_qfq component
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.29% (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: cbl2 kernel 5.15.122.1-2 on CBL Mariner 2.0 5.15.122.1-2; cm1 kernel 5.10.188.1-1 on CBL Mariner 1.0 5.10.188.1-1.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to cbl2 kernel 5.15.122.1-2 on CBL Mariner 2.0 5.15.122.1-2; cm1 kernel 5.10.188.1-1 on CBL Mariner 1.0 5.10.188.1-1 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 out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. We recommend upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64.
- BDU:2023-04269
- DLA-3710-1
- DSA-5492-1
- RHSA-2023:7419
- RHSA-2023:7423
- RHSA-2023:7424
- RHSA-2024:0261
- RHSA-2024:0262
- RHSA-2024:0378
- RHSA-2024:0554
- RHSA-2024:0575
- RHSA-2024:1268
- RHSA-2024:1269
- RHSA-2024:1278
- RHSA-2024:1367
- RHSA-2024:1377
- RHSA-2024:1382
- RHSA-2024:1831
- SUSE-SU-2023:3182-1
- SUSE-SU-2023:3309-1
- Published
- Jul 21, 2023
- Updated
- Oct 14, 2026
- EPSS
- 0.2% · 21th percentile
- CWE
- CWE-787
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.8
- CNA · Google
- 7.8
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- debian debian linux11.0
- debian debian linux12.0
- linux linux kernel5.5 and later · before 5.10.188
- linux linux kernel5.11 and later · before 5.15.121
- linux linux kernel3.8 and later · before 4.14.322
- linux linux kernel6.2 and later · before 6.4.5
- linux linux kernel5.16 and later · before 6.1.40
- linux linux kernel4.15 and later · before 4.19.291
- linux linux kernel4.20 and later · before 5.4.253
- linux linux kernel6.5
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Google). Independent of NVD's CPE analysis and usually ahead of it.
Linux Kernel
- 3.8 and later · before 6.5affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:10 | linux | before 4.19.304-1 | 4.19.304-1 |
| Debian:12 | linux | before 6.1.52-1 | 6.1.52-1 |
| Debian:13 | linux | before 6.4.4-2 | 6.4.4-2 |
| openSUSE:Leap 15.4 | dtb-aarch64 | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | dtb-aarch64 | before 5.3.18-150300.59.130.1 | 5.3.18-150300.59.130.1 |
| openSUSE:Leap 15.4 | kernel-64kb | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-azure | before 5.14.21-150400.14.60.1 | 5.14.21-150400.14.60.1 |
| openSUSE:Leap 15.4 | kernel-debug | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-debug | before 4.12.14-150100.197.154.1 | 4.12.14-150100.197.154.1 |
| openSUSE:Leap 15.4 | kernel-default | before 4.12.14-150100.197.154.1 | 4.12.14-150100.197.154.1 |
| openSUSE:Leap 15.4 | kernel-docs | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-kvmsmall | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-kvmsmall | before 4.12.14-150100.197.154.1 | 4.12.14-150100.197.154.1 |
| openSUSE:Leap 15.4 | kernel-obs-build | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-obs-qa | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-rt_debug | before 5.14.21-150400.15.46.1 | 5.14.21-150400.15.46.1 |
| openSUSE:Leap 15.4 | kernel-source | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-source-azure | before 5.14.21-150400.14.60.1 | 5.14.21-150400.14.60.1 |
| openSUSE:Leap 15.4 | kernel-source-rt | before 5.14.21-150400.15.46.1 | 5.14.21-150400.15.46.1 |
| openSUSE:Leap 15.4 | kernel-syms | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
| openSUSE:Leap 15.4 | kernel-syms-azure | before 5.14.21-150400.14.60.1 | 5.14.21-150400.14.60.1 |
| openSUSE:Leap 15.4 | kernel-syms-rt | before 5.14.21-150400.15.46.1 | 5.14.21-150400.15.46.1 |
| openSUSE:Leap 15.4 | kernel-vanilla | before 4.12.14-150100.197.154.1 | 4.12.14-150100.197.154.1 |
| openSUSE:Leap 15.4 | kernel-zfcpdump | before 5.14.21-150400.24.81.1 | 5.14.21-150400.24.81.1 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2023-3609Jul 21, 2023 · Use-after-free in Linux kernel's net/sched: cls_u32 component31Monitor
- ← EarlierCVE-2023-3610Jul 21, 2023 · Use-after-free in Linux kernel's netfilter: nf_tables component31Monitor
- Later →CVE-2023-2430Jul 22, 2023 · A vulnerability was found due to missing lock for IOPOLL flaw in io_cqring_event_overflow() in io_uring.c in Linux Kernel.22Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| cbl2 kernel 5.15.122.1-2 on CBL Mariner 2.0 | 5.15.122.1-2 · CBL-Mariner Releases | Microsoft (MSRC) |
| cm1 kernel 5.10.188.1-1 on CBL Mariner 1.0 | 5.10.188.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.52-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-64kb | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-azure | 5.14.21-150400.14.60.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-debug | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-default | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-default-base | 5.14.21-150500.55.19.1.150500.6.6.4 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-docs | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-build | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 5.14.21-150500.55.19.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-source-azure | 5.14.21-150400.14.60.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:kernel-syms-azure | 5.14.21-150400.14.60.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| red hat:bpftool | 0:3.10.0-1160.105.1.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:3.10.0-1160.105.1.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_102_1 | 0:1-1.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_102_1-debuginfo | 0:1-1.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_90_1 | 0:1-4.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_90_1-debuginfo | 0:1-4.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_92_1 | 0:1-4.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_92_1-debuginfo | 0:1-4.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_95_1 | 0:1-3.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_95_1-debuginfo | 0:1-3.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_99_1 | 0:1-2.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| red hat:kpatch-patch-3_10_0-1160_99_1-debuginfo | 0:1-2.el7 · Red Hat:enterprise_linux:7::server | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150500.55.19.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP5 | Package registry (OSV) |
| suse:kernel-azure | 5.14.21-150400.14.60.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.173.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5 | Package registry (OSV) |
+12
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.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Lionfinder
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-23-0661 · Nov 24, 2023(RedHat Güvenlik Güncellemesi)
- TR-23-0509 · Sep 11, 2023(Linux Kernel Güncellemesi)
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 WriteCVSS 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.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- kernel.dance/3e337087c3b5805fe0b8a46ba622a962880b5d64
- lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- security.netapp.com/advisory/ntap-20230908-0002/
- www.debian.org/security/2023/dsa-5480
- www.debian.org/security/2023/dsa-5492
- cert-portal.siemens.com/productcert/html/ssa-398330.html
- cert-portal.siemens.com/productcert/html/ssa-769027.html
- cert-portal.siemens.com/productcert/html/ssa-794697.html
- cert-portal.siemens.com/productcert/html/ssa-806742.html
- cert-portal.siemens.com/productcert/html/ssa-831302.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.