NVD / CVE Program· CNA Linux

CVE-2024-27396: net: gtp: Fix Use-After-Free in gtp_dellink

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: 0.24% (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 07b20d0a3dc13fb1adff10b60021a4924498da58, 0caff3e6390f840666b8dc1ecebf985c2ef3f1dd, 25a1c2d4b1fcf938356a9688a96a6456abd44b29; azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1.

Low priority for now. Upgrade to Linux Linux 07b20d0a3dc13fb1adff10b60021a4924498da58, 0caff3e6390f840666b8dc1ecebf985c2ef3f1dd, 25a1c2d4b1fcf938356a9688a96a6456abd44b29; azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1 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

In the Linux kernel, the following vulnerability has been resolved: net: gtp: Fix Use-After-Free in gtp_dellink Since call_rcu, which is called in the hlist_for_each_entry_rcu traversal of gtp_dellink, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free. To prevent this, it should be changed to hlist_for_each_entry_safe.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2024-03933

Published: May 14, 2024
Updated: Oct 15, 2026
EPSS: 0.2% · 15th percentile
CWE: CWE-416

Report tools

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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.

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
linux linux kernel4.19.93 and later · before 4.19.313
linux linux kernel5.4.8 and later · before 5.4.275
linux linux kernel5.5 and later · before 5.10.216
linux linux kernel5.11 and later · before 5.15.158
linux linux kernel4.14.162 and later · before 4.15
linux linux kernel6.2 and later · before 6.6.30
linux linux kernel6.7 and later · before 6.8.9
linux linux kernel5.16 and later · before 6.1.90
linux linux kernel6.9

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
- a29c4303930bc0c25ae6a4f365dcdef71447b4ea, 5.5affected
- 043a283d24f40fea4c8a8d06b0e2694c8e372200 and later · before 07b20d0a3dc13fb1adff10b60021a4924498da58affected · git
- c185e1d6e2752a4b656c3ca878c525fa11f55757 and later · before 718df1bc226c383dd803397d7f5d95557eb81ac7affected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before 0caff3e6390f840666b8dc1ecebf985c2ef3f1ddaffected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before 2e74b3fd6bf542349758f283676dff3660327c07affected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before 25a1c2d4b1fcf938356a9688a96a6456abd44b29affected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before 2aacd4de45477582993f8a8abb9505a06426bfb6affected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before cd957d1716ec979d8f5bf38fc659aeb9fdaa2474affected · git
- 94dc550a5062030569d4aa76e10e50c8fc001930 and later · before f2a904107ee2b647bb7794a1a82b67740d7c8a64affected · git
- 4.19.93 and later · before 4.19.313affected · 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 6.1.90-1	6.1.90-1
Debian:13	linux	before 6.8.9-1	6.8.9-1

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-2024-27401May 14, 2024 · firewire: nosy: ensure user_length is taken into account when fetching packet contents
28Monitor
← EarlierCVE-2024-27395May 14, 2024 · net: openvswitch: Fix Use-After-Free in ovs_ct_exit
31Monitor
Later →CVE-2024-27397May 14, 2024 · netfilter: nf_tables: use timestamp to check for set element timeout
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 / package	Fixed version	Source
Linux Linux	07b20d0a3dc13fb1adff10b60021a4924498da58	Vendor (CNA)
Linux Linux	0caff3e6390f840666b8dc1ecebf985c2ef3f1dd	Vendor (CNA)
Linux Linux	25a1c2d4b1fcf938356a9688a96a6456abd44b29	Vendor (CNA)
Linux Linux	2aacd4de45477582993f8a8abb9505a06426bfb6	Vendor (CNA)
Linux Linux	2e74b3fd6bf542349758f283676dff3660327c07	Vendor (CNA)
Linux Linux	4.15	Vendor (CNA)
Linux Linux	4.19.313	Vendor (CNA)
Linux Linux	5.4.275	Vendor (CNA)
Linux Linux	718df1bc226c383dd803397d7f5d95557eb81ac7	Vendor (CNA)
Linux Linux	cd957d1716ec979d8f5bf38fc659aeb9fdaa2474	Vendor (CNA)
Linux Linux	f2a904107ee2b647bb7794a1a82b67740d7c8a64	Vendor (CNA)
azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0	6.6.35.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0	6.6.35.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.90-1 · Debian:12	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).

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/07b20d0a3dc13fb1adff10b60021a4924498da58

Show all references (11 more)

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

All records