Unknown

CVE-2026-80846 — xfrm: drop ESP-in-TCP packets with no ingress device

In the Linux kernel, the following vulnerability has been resolved: xfrm: drop ESP-in-TCP packets with no ingress device ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path. Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device. Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.

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	≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 239d0f71af09dc2029fd4d730cb24b8c83aaa43a≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < f00235f9d12301183d61f75fbe4105506f3e5140≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 6af5cdb03819a5ce6e945992635c6c5e91045367≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 2dd1609cadff46c4b20ce53b91ab9cce1380456a≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < c296d25efbc840be24de83f56d43bc47e714ace9≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 328e40aa774b446969c69b654c52a051a95af8a1≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 7911e0236616487b89db6bd3ba3f408abd10eb23≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < 943d95233b8b4a88994e244fcf466f8c403d63f1 and 2 more ≥ e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and < e1d7c5ac1c246ce5775f604515de0a59fbf2116eversion 5.6	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

git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1
NIST National Vulnerability Database
git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1
NIST National Vulnerability Database
git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e
NIST National Vulnerability Database
git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23
NIST National Vulnerability Database
git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a
NIST National Vulnerability Database
git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140
NIST National Vulnerability Database
git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a
NIST National Vulnerability Database
git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9
NIST National Vulnerability Database
git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367
NIST National Vulnerability Database
github.com/advisories/GHSA-7qhp-m2hr-xxjv
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-80846
GitHub Security Advisories

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 14h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 14h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 14h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 14h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 14h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 14h

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-2026-80846 is "xfrm: drop ESP-in-TCP packets with no ingress device", 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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