Unknown

CVE-2026-80792 — ipv6: fix use-after-free in ip6_finish_output2()

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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 26, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 and < 75e0a544ebe9af663ef53ca21e9e9185c51fb54a≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < c95f01b78266828a57060d754fcbfc92123a98ed≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < d960881b9312e781a3429aabceb223ce6b7c882f≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < 087ee0d914aaae929f1660c9ca878e367655ba1a≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < 3c770ac4e6f07af7c7b40c474a3efc61ffed7862≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < 3dc98e5fe82d069dd29b124ffbdb679331dfea43≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < 99219c82804f266189388e8bf1cf5135d10d5515≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < 73a187384a8c8b983c7fea046d716b6752a1e7a3 and 5 more ≥ e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 and < d0d48d999b0eee6bb176ef4e39d9be868fa80f7eversion 1598154fd28ffa4a55beae1970475fd6776554b6≥ 5.10.233 and < 5.10.267≥ 5.4.289 and < 5.5version 5.15	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 26, 2026 · 11 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

11 on the record

nvd.nist.gov/vuln/detail/CVE-2026-80792
GitHub Security Advisories
git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a
NIST National Vulnerability Database
git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3
NIST National Vulnerability Database
git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f
NIST National Vulnerability Database
git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed
NIST National Vulnerability Database
github.com/advisories/GHSA-4jhv-hqg8-9j35
GitHub Security Advisories
git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e
NIST National Vulnerability Database
git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43
NIST National Vulnerability Database
git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a
NIST National Vulnerability Database
git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515
NIST National Vulnerability Database
git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses 23h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 23h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 23h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 23h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 23h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 23h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80792 is "ipv6: fix use-after-free in ip6_finish_output2()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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