Linux Kernel up to 7.2.0 IPv6 ip6_finish_output2 use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.88

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 7.2.0. Affected is the function ip6_finish_output2 of the component IPv6. Executing a manipulation can lead to use after free. The identification of this vulnerability is CVE-2026-80792. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.0. It has been declared as very critical. This vulnerability affects the function ip6_finish_output2 of the component IPv6. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix use-after-free in ip6_finish_output2() ip6_finish_output2() caches a pointer to the IPv6 destination address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF transmit path or other encapsulation operations within lwtunnel_xmit() can reallocate the skb head, freeing the memory that daddr points to. When lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale daddr pointer to compute the nexthop and to look up or create the neighbour entry. This results in a use-after-free read, which can leak sensitive kernel data, pollute the neighbour table with arbitrary values, misdirect traffic, or crash the system. Fix this by re-fetching the IPv6 header and the destination address pointer after lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop computation and neighbour lookup operate on valid memory.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-80792 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/04/2026).

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 75e0a544ebe9af663ef53ca21e9e9185c51fb54a/c95f01b78266828a57060d754fcbfc92123a98ed/d960881b9312e781a3429aabceb223ce6b7c882f/087ee0d914aaae929f1660c9ca878e367655ba1a/3c770ac4e6f07af7c7b40c474a3efc61ffed7862/3dc98e5fe82d069dd29b124ffbdb679331dfea43/99219c82804f266189388e8bf1cf5135d10d5515/73a187384a8c8b983c7fea046d716b6752a1e7a3/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e is able to eliminate this problem.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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: 75e0a544ebe9af663ef53ca21e9e9185c51fb54a/c95f01b78266828a57060d754fcbfc92123a98ed/d960881b9312e781a3429aabceb223ce6b7c882f/087ee0d914aaae929f1660c9ca878e367655ba1a/3c770ac4e6f07af7c7b40c474a3efc61ffed7862/3dc98e5fe82d069dd29b124ffbdb679331dfea43/99219c82804f266189388e8bf1cf5135d10d5515/73a187384a8c8b983c7fea046d716b6752a1e7a3/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e

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-2026-80792 (🔒)
GCVE (CVE): GCVE-0-2026-80792
GCVE (VulDB): GCVE-100-398914

Entryinfo

Created: 09/04/2026 18:14
Changes: 09/04/2026 18:14 (59)
Complete: 🔍
Cache ID: 216::103

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