CVE-2026-46306: flow_dissector: do not dissect PPPoE PFC frames
Noroxi assessment
Priority: Monitor (action score 30/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.44% (FIRST EPSS).
- 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.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 0d00b9015069712944934bab09eaa6c542143049, 18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3, 6044392d9cace3a3672b02c8bc7d38b502e51734; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
Low priority for now. Upgrade to Linux Linux 0d00b9015069712944934bab09eaa6c542143049, 18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3, 6044392d9cace3a3672b02c8bc7d38b502e51734; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: flow_dissector: do not dissect PPPoE PFC frames RFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT RECOMMENDED for PPPoE. In practice, pppd does not support negotiating PFC for PPPoE sessions, and the flow dissector driver has assumed an uncompressed frame until the blamed commit. During the review process of that commit [1], support for PFC is suggested. However, having a compressed (1-byte) protocol field means the subsequent PPP payload is shifted by one byte, causing 4-byte misalignment for the network header and an unaligned access exception on some architectures. The exception can be reproduced by sending a PPPoE PFC frame to an ethernet interface of a MIPS board, with RPS enabled, even if no PPPoE session is active on that interface: $ 0 : 00000000 80c40000 00000000 85144817 $ 4 : 00000008 00000100 80a75758 81dc9bb8 $ 8 : 00000010 8087ae2c 0000003d 00000000 $12 : 000000e0 00000039 00000000 00000000 $16 : 85043240 80a75758 81dc9bb8 00006488 $20 : 0000002f 00000007 85144810 80a70000 $24 : 81d1bda0 00000000 $28 : 81dc8000 81dc9aa8 00000000 805ead08 Hi : 00009d51 Lo : 2163358a epc : 805e91f0 __skb_flow_dissect+0x1b0/0x1b50 ra : 805ead08 __skb_get_hash_net+0x74/0x12c Status: 11000403 KERNEL EXL IE Cause : 40800010 (ExcCode 04) BadVA : 85144817 PrId : 0001992f (MIPS 1004Kc) Call Trace: [<805e91f0>] __skb_flow_dissect+0x1b0/0x1b50 [<805ead08>] __skb_get_hash_net+0x74/0x12c [<805ef330>] get_rps_cpu+0x1b8/0x3fc [<805fca70>] netif_receive_skb_list_internal+0x324/0x364 [<805fd120>] napi_complete_done+0x68/0x2a4 [<8058de5c>] mtk_napi_rx+0x228/0xfec [<805fd398>] __napi_poll+0x3c/0x1c4 [<805fd754>] napi_threaded_poll_loop+0x234/0x29c [<805fd848>] napi_threaded_poll+0x8c/0xb0 [<80053544>] kthread+0x104/0x12c [<80002bd8>] ret_from_kernel_thread+0x14/0x1c Code: 02d51821 1060045b 00000000 <8c640000> 3084000f 2c820005 144001a2 00042080 8e220000 To reduce the attack surface and maintain performance, do not process PPPoE PFC frames. [1] https://lore.kernel.org/r/20220630231016.GA392@debian.home
- Published
- Jun 8, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.4% · 38th percentile
- CWE
- CWE-198
Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.5
- 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.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel6.0 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.140
- linux linux kernel6.7 and later · before 6.12.88
- linux linux kernel6.13 and later · before 6.18.30
- linux linux kernel6.19 and later · before 7.0.7
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
- 6.0affected
- 10f665b52a75df6eb26ddebbbc072ee264183731 and later · before e7c811ca372d53c2be7d01a1614e71fae1054836affected · git
- d7e541e86122d21f71eb71c5dfa7fb1eb6623fe8 and later · before abc5bc84e0f2edc7ea2d437afa6ef3fe1fc43200affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before 18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before db104b0d8a7856397c0469d83a4289adf7c54863affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before 6044392d9cace3a3672b02c8bc7d38b502e51734affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before 0d00b9015069712944934bab09eaa6c542143049affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before 7c93f353eab4ea911e394630f07d72e040a729d8affected · git
- 46126db9c86110e5fc1e369b9bb89735ddefdae4 and later · before d6c19b31a3c1d519fabdcf0aa239e6b6109b9473affected · git
- before 6.0not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.164.1.el8_10 | 4.18.0-553.164.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.164.1.rt7.505.el8_10 | 4.18.0-553.164.1.rt7.505.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-46303Jun 8, 2026 · isofs: validate Rock Ridge CE continuation extent against volume size32Monitor
- ← EarlierCVE-2026-46304Jun 8, 2026 · nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free30Monitor
- Later →CVE-2026-46307Jun 8, 2026 · wifi: ath5k: do not access array OOB33Monitor
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 | 0d00b9015069712944934bab09eaa6c542143049 | Vendor (CNA) |
| Linux Linux | 18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3 | Vendor (CNA) |
| Linux Linux | 6044392d9cace3a3672b02c8bc7d38b502e51734 | Vendor (CNA) |
| Linux Linux | 7c93f353eab4ea911e394630f07d72e040a729d8 | Vendor (CNA) |
| Linux Linux | abc5bc84e0f2edc7ea2d437afa6ef3fe1fc43200 | Vendor (CNA) |
| Linux Linux | d6c19b31a3c1d519fabdcf0aa239e6b6109b9473 | Vendor (CNA) |
| Linux Linux | db104b0d8a7856397c0469d83a4289adf7c54863 | Vendor (CNA) |
| Linux Linux | e7c811ca372d53c2be7d01a1614e71fae1054836 | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.141.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.46.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
+6
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-198 · Use of Incorrect Byte OrderingCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (10 more)Show less
- git.kernel.org/stable/c/18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3
- git.kernel.org/stable/c/6044392d9cace3a3672b02c8bc7d38b502e51734
- git.kernel.org/stable/c/7c93f353eab4ea911e394630f07d72e040a729d8
- git.kernel.org/stable/c/abc5bc84e0f2edc7ea2d437afa6ef3fe1fc43200
- git.kernel.org/stable/c/d6c19b31a3c1d519fabdcf0aa239e6b6109b9473
- git.kernel.org/stable/c/db104b0d8a7856397c0469d83a4289adf7c54863
- git.kernel.org/stable/c/e7c811ca372d53c2be7d01a1614e71fae1054836
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.