Linux Kernel up to 7.2.0 ipv4 ip_do_fragment resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.41

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.0 and classified as critical. This affects the function ip_do_fragment of the component ipv4. The manipulation results in resource consumption. This vulnerability is cataloged as CVE-2026-80793. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 7.2.0. Affected is the function ip_do_fragment of the component ipv4. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ipv4: reject undersized MTUs in ip_do_fragment() ip_do_fragment() subtracts the IPv4 header length from the effective MTU and passes the resulting payload MTU to ip_frag_next(). If the effective MTU is smaller than hlen + 8, ip_frag_next() rounds the fragment payload length down to zero. The fragmentation state then never makes forward progress: state->left, state->ptr and state->offset stay unchanged while ip_do_fragment() keeps allocating and transmitting header-only fragments until the softlockup detector fires. This is reproducible with a route installed using "mtu lock 20", but it is also reproducible without route MTU lock, for example by forwarding a packet to a device whose MTU is 20. Fix it in ip_do_fragment() by rejecting mtu < hlen + 8 with -EMSGSIZE, matching the existing IPv6 fragmentation check.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-80793 since 08/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/04/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch a716a64a4ba68cd46f2745fba2b1099fe8e0aa59/515b6816ba0c12d8415c88e5f41e6ec029e35cfa/74ce7389f8f562d39015f59a00ef7ad6acd37803/b0ea911453ce7210e8200a07a94d2458bd1e6430/36e0741833bd823866f8cb9f112f37cea1a70b60/d9d1a676b033acabf8e5645f730486d1f8204a3f/3556beb8ca86677af2aca5bfbed6f8e790fccc83/c8a74adccaf028223054633b532593101dfcc581/c0726f0caf8c6b3208552949e17d23634a2f3129 is able to eliminate this problem.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.267/5.15.218/6.1.185/6.6.154/6.12.106/6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: a716a64a4ba68cd46f2745fba2b1099fe8e0aa59/515b6816ba0c12d8415c88e5f41e6ec029e35cfa/74ce7389f8f562d39015f59a00ef7ad6acd37803/b0ea911453ce7210e8200a07a94d2458bd1e6430/36e0741833bd823866f8cb9f112f37cea1a70b60/d9d1a676b033acabf8e5645f730486d1f8204a3f/3556beb8ca86677af2aca5bfbed6f8e790fccc83/c8a74adccaf028223054633b532593101dfcc581/c0726f0caf8c6b3208552949e17d23634a2f3129

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80793 (🔒)
GCVE (CVE): GCVE-0-2026-80793
GCVE (VulDB): GCVE-100-398934

Entryinfo

Created: 09/04/2026 18:24
Changes: 09/04/2026 18:24 (59)
Complete: 🔍
Cache ID: 216::103

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