NVD / CVE Program· CNA Linux

CVE-2024-46800: sch/netem: fix use after free in netem_dequeue

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: Linux Linux 14f91ab8d391f249b845916820a56f42cf747241, 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9, 32008ab989ddcff1a485fa2b4906234c25dc5cd6; Azure Linux 3.0 ARM 6.6.51.1-5; Azure Linux 3.0 x64 6.6.51.1-5.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 14f91ab8d391f249b845916820a56f42cf747241, 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9, 32008ab989ddcff1a485fa2b4906234c25dc5cd6; Azure Linux 3.0 ARM 6.6.51.1-5; Azure Linux 3.0 x64 6.6.51.1-5 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

In the Linux kernel, the following vulnerability has been resolved: sch/netem: fix use after free in netem_dequeue If netem_dequeue() enqueues packet to inner qdisc and that qdisc returns __NET_XMIT_STOLEN. The packet is dropped but qdisc_tree_reduce_backlog() is not called to update the parent's q.qlen, leading to the similar use-after-free as Commit e04991a48dbaf382 ("netem: fix return value if duplicate enqueue fails") Commands to trigger KASAN UaF: ip link add type dummy ip link set lo up ip link set dummy0 up tc qdisc add dev lo parent root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2: handle 3: drr tc filter add dev lo parent 3: basic classid 3:1 action mirred egress redirect dev dummy0 tc class add dev lo classid 3:1 drr ping -c1 -W0.01 localhost # Trigger bug tc class del dev lo classid 1:1 tc class add dev lo classid 1:1 drr ping -c1 -W0.01 localhost # UaF

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Sep 18, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 22th percentile
CWE: CWE-416

Report tools

JSON

Action score

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: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 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.

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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.

ProductVersion

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel3.3 and later · before 4.19.322
linux linux kernel4.20 and later · before 5.4.284
linux linux kernel5.5 and later · before 5.10.226
linux linux kernel5.11 and later · before 5.15.167
linux linux kernel5.16 and later · before 6.1.110
linux linux kernel6.2 and later · before 6.6.51
linux linux kernel6.7 and later · before 6.10.10
linux linux kernel6.11

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
- 3.3affected
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before f0bddb4de043399f16d1969dad5ee5b984a64e7baffected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9affected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before 98c75d76187944296068d685dfd8a1e9fd8c4fdcaffected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before 14f91ab8d391f249b845916820a56f42cf747241affected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before db2c235682913a63054e741fe4e19645fdf2d68eaffected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before dde33a9d0b80aae0c69594d1f462515d7ff1cb3daffected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before 32008ab989ddcff1a485fa2b4906234c25dc5cd6affected · git
- 50612537e9ab29693122fab20fc1eed235054ffe and later · before 3b3a2a9c6349e25a025d2330f479bc33a6ccb54aaffected · git
- before 3.3not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.112-1	6.1.112-1
Debian:13	linux	before 6.10.11-1	6.10.11-1
SUSE:Linux Enterprise Live Patching 12 SP5	kernel-default	before 4.12.14-122.237.1	4.12.14-122.237.1
SUSE:Linux Enterprise Live Patching 12 SP5	kgraft-patch-SLE12-SP5_Update_63	before 1-8.3.1	1-8.3.1
SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	kernel-coco	before 6.4.0-15061.12.coco15sp6.1	6.4.0-15061.12.coco15sp6.1
SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	kernel-coco_debug	before 6.4.0-15061.12.coco15sp6.1	6.4.0-15061.12.coco15sp6.1
SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	kernel-source-coco	before 6.4.0-15061.12.coco15sp6.1	6.4.0-15061.12.coco15sp6.1
SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	kernel-syms-coco	before 6.4.0-15061.12.coco15sp6.1	6.4.0-15061.12.coco15sp6.1
SUSE:Linux Enterprise Server 12 SP5-LTSS	kernel-source	before 4.12.14-122.237.1	4.12.14-122.237.1
SUSE:Linux Enterprise Server 12 SP5-LTSS	kernel-syms	before 4.12.14-122.237.1	4.12.14-122.237.1

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-2024-46798Sep 18, 2024 · ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object
31Monitor
← EarlierCVE-2024-46799Sep 18, 2024 · net: ethernet: ti: am65-cpsw: Fix NULL dereference on XDP_TX
22Monitor
Later →CVE-2024-46801Sep 18, 2024 · libfs: fix get_stashed_dentry()
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
Linux Linux	14f91ab8d391f249b845916820a56f42cf747241	Vendor (CNA)
Linux Linux	295ad5afd9efc5f67b86c64fce28fb94e26dc4c9	Vendor (CNA)
Linux Linux	32008ab989ddcff1a485fa2b4906234c25dc5cd6	Vendor (CNA)
Linux Linux	3b3a2a9c6349e25a025d2330f479bc33a6ccb54a	Vendor (CNA)
Linux Linux	98c75d76187944296068d685dfd8a1e9fd8c4fdc	Vendor (CNA)
Linux Linux	db2c235682913a63054e741fe4e19645fdf2d68e	Vendor (CNA)
Linux Linux	dde33a9d0b80aae0c69594d1f462515d7ff1cb3d	Vendor (CNA)
Linux Linux	f0bddb4de043399f16d1969dad5ee5b984a64e7b	Vendor (CNA)
Azure Linux 3.0 ARM	6.6.51.1-5 · kernel	Microsoft (MSRC)
Azure Linux 3.0 x64	6.6.51.1-5 · kernel	Microsoft (MSRC)
CBL Mariner 2.0 ARM	5.15.167.1-1 · kernel	Microsoft (MSRC)
CBL Mariner 2.0 x64	5.15.167.1-1 · kernel	Microsoft (MSRC)
debian:linux	6.1.112-1 · Debian:12	Package registry (OSV)
suse:kernel-coco	6.4.0-15061.12.coco15sp6.1 · SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	Package registry (OSV)
suse:kernel-coco_debug	6.4.0-15061.12.coco15sp6.1 · SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	Package registry (OSV)
suse:kernel-default	4.12.14-122.237.1 · SUSE:Linux Enterprise Live Patching 12 SP5	Package registry (OSV)
suse:kernel-source	4.12.14-122.237.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS	Package registry (OSV)
suse:kernel-source-coco	6.4.0-15061.12.coco15sp6.1 · SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	Package registry (OSV)
suse:kernel-syms	4.12.14-122.237.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS	Package registry (OSV)
suse:kernel-syms-coco	6.4.0-15061.12.coco15sp6.1 · SUSE:Linux Enterprise Module for Confidential Computing Technical Preview 15 SP6	Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_63	1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5	Package 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.

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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-24-1498 · Sep 19, 2024(Linux Kernel Güvenlik Bildirimi)

All national notices →

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-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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✗ → ✓Sep 28, 2026, 10:10 PM UTC

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

References

git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241

Show all references (9 more)

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

All records