NVD / CVE Program· CNA Linux

CVE-2021-47310: net: ti: fix UAF in tlan_remove_one

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: 0.25% (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 0336f8ffece62f882ab3012820965a786a983f70, 0538b0ab7d2c396e385694228c7cdcd2d2c514e9, 93efab0ef2a607fff9166d447c4035f98b5db342.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0336f8ffece62f882ab3012820965a786a983f70, 0538b0ab7d2c396e385694228c7cdcd2d2c514e9, 93efab0ef2a607fff9166d447c4035f98b5db342 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: net: ti: fix UAF in tlan_remove_one priv is netdev private data and it cannot be used after free_netdev() call. Using priv after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 21, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 16th 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.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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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.

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 kernel3.10 and later · before 4.4.277
linux linux kernel4.5 and later · before 4.9.277
linux linux kernel4.10 and later · before 4.14.241
linux linux kernel4.15 and later · before 4.19.199
linux linux kernel4.20 and later · before 5.4.135
linux linux kernel5.5 and later · before 5.10.53
linux linux kernel5.11 and later · before 5.13.5
linux linux kernel5.14

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
- 3.10affected
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before a18a8d9cfbb112ad72e625372849adc3986fd6bfaffected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before c263ae8c7e4c482387de5e6c89e213f8173fe8b6affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before 0538b0ab7d2c396e385694228c7cdcd2d2c514e9affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before a0a817b2d308fac090a05cbbe80988e073ac5193affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before b7e5563f2a7862a9e4796abb9908b092f677e3c1affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before f2a062fcfe1d6f1b0a86fa76ae21c277d65f4405affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before 93efab0ef2a607fff9166d447c4035f98b5db342affected · git
- 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa and later · before 0336f8ffece62f882ab3012820965a786a983f70affected · git
- before 3.10not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	bpftool	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-abi-stablelists	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-core	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-cross-headers	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-core	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-devel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-modules	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-modules-extra	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-devel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-doc	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-headers	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-modules	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-modules-extra	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-rt	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-core	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-core	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-devel	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-kvm	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-modules	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-modules-extra	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-devel	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10

+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
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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-2021-47308May 21, 2024 · scsi: libfc: Fix array index out of bound exception
35Monitor
← EarlierCVE-2021-47309May 21, 2024 · net: validate lwtstate->data before returning from skb_tunnel_info()
28Monitor
Later →CVE-2021-47311May 21, 2024 · net: qcom/emac: fix UAF in emac_remove
31Monitor

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	0336f8ffece62f882ab3012820965a786a983f70	Vendor (CNA)
Linux Linux	0538b0ab7d2c396e385694228c7cdcd2d2c514e9	Vendor (CNA)
Linux Linux	93efab0ef2a607fff9166d447c4035f98b5db342	Vendor (CNA)
Linux Linux	a0a817b2d308fac090a05cbbe80988e073ac5193	Vendor (CNA)
Linux Linux	a18a8d9cfbb112ad72e625372849adc3986fd6bf	Vendor (CNA)
Linux Linux	b7e5563f2a7862a9e4796abb9908b092f677e3c1	Vendor (CNA)
Linux Linux	c263ae8c7e4c482387de5e6c89e213f8173fe8b6	Vendor (CNA)
Linux Linux	f2a062fcfe1d6f1b0a86fa76ae21c277d65f4405	Vendor (CNA)
almalinux:bpftool	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-abi-stablelists	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-core	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-cross-headers	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-core	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-devel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules-extra	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-devel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-doc	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
debian:linux	5.14.6-1 · Debian:12	Package registry (OSV)
red hat:bpftool	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:bpftool-debuginfo	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-abi-stablelists	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-core	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-core	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-devel	0:4.18.0-553.8.1.el8_10 · Red Hat:enterprise_linux:8::baseos	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-24-0519 · May 22, 2024(Linux Kernel Güncellemesi)

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/0336f8ffece62f882ab3012820965a786a983f70

Show all references (7 more)

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

All records