vxlan: re-fetch eth header after route_shortcircuit()
In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().
- Published
- Aug 28, 2026
- Updated
- Aug 29, 2026
- EPSS
- 0.7% · 53th percentile
- CWE
- —
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Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.7%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
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
- 3.10affected
- ae8840825605f36f98f247323edc150e761cb64e and later · before 6375093eb45cd7d89f1945f939eeae3b29d79f56affected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before 1b7f7b653e3557690047c62f03b80a24ea5a58a5affected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before bf045341dfb3e767f0ff94cf240ce3c371973bd4affected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before 2355c8c26d2aa1b4385b369e67202e47d460d555affected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585affected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before 1235e017aa11cf01e91b613c4c5ed6aa28934fffaffected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before c9dceac9e1c7c772c43c732fc0d325e72835801aaffected · git
- ae8840825605f36f98f247323edc150e761cb64e and later · before 1395a676ec15a0a02a2a6d86602324f2d5fd41d5affected · git
- before 3.10not affected · 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 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.107-1~deb12u1 | 6.12.107-1~deb12u1 |
| Debian:13 | linux | before 6.12.105-1 | 6.12.105-1 |
| Debian:14 | linux | before 7.1.8-1 | 7.1.8-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 1235e017aa11cf01e91b613c4c5ed6aa28934fff | Vendor (CNA) |
| Linux Linux | 1395a676ec15a0a02a2a6d86602324f2d5fd41d5 | Vendor (CNA) |
| Linux Linux | 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 | Vendor (CNA) |
| Linux Linux | 1b7f7b653e3557690047c62f03b80a24ea5a58a5 | Vendor (CNA) |
| Linux Linux | 2355c8c26d2aa1b4385b369e67202e47d460d555 | Vendor (CNA) |
| Linux Linux | 6375093eb45cd7d89f1945f939eeae3b29d79f56 | Vendor (CNA) |
| Linux Linux | bf045341dfb3e767f0ff94cf240ce3c371973bd4 | Vendor (CNA) |
| Linux Linux | c9dceac9e1c7c772c43c732fc0d325e72835801a | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | 6.6.152.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.107-1~deb12u1 · 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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 researchersFinders, 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
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- 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
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff
- git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5
- git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585
- git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5
- git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555
- git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56
- git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4
- git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.