netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one
Noroxi assessment
Priority: Monitor (action score 28/100)
- 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: 0.28% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 26bd1f210d3783a691052c51d76bb8a8bbd24c67, 337fdce450637ea663bc816edc2ba81e5cdad02e, 5c618daa5038712c4a4ef8923905a2ea1b8836a1.
Low priority for now. Upgrade to Linux Linux 26bd1f210d3783a691052c51d76bb8a8bbd24c67, 337fdce450637ea663bc816edc2ba81e5cdad02e, 5c618daa5038712c4a4ef8923905a2ea1b8836a1 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
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one Eric Dumazet says: nf_conntrack_dccp_packet() has an unique: dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); And nothing more is 'pulled' from the packet, depending on the content. dh->dccph_doff, and/or dh->dccph_x ...) So dccp_ack_seq() is happily reading stuff past the _dh buffer. BUG: KASAN: stack-out-of-bounds in nf_conntrack_dccp_packet+0x1134/0x11c0 Read of size 4 at addr ffff000128f66e0c by task syz-executor.2/29371 [..] Fix this by increasing the stack buffer to also include room for the extra sequence numbers and all the known dccp packet type headers, then pull again after the initial validation of the basic header. While at it, mark packets invalid that lack 48bit sequence bit but where RFC says the type MUST use them. Compile tested only. v2: first skb_header_pointer() now needs to adjust the size to only pull the generic header. (Eric) Heads-up: I intend to remove dccp conntrack support later this year.
- Published
- Sep 16, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.3% · 19th percentile
- CWE
- CWE-125
Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.1
- CNA · Linux
- 8.2
- 1.1 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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.
Running WordPress? Scan your site free with WP Lens
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 kernel2.6.26 and later · before 5.4.251
- linux linux kernel5.5 and later · before 5.10.188
- linux linux kernel5.11 and later · before 5.15.121
- linux linux kernel5.16 and later · before 6.1.39
- linux linux kernel6.2 and later · before 6.3.13
- linux linux kernel6.4 and later · before 6.4.4
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
- 2.6.26affected
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before 337fdce450637ea663bc816edc2ba81e5cdad02eaffected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8affected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before c052797ac36813419ad3bfa54cb8615db4b41f15affected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before 5c618daa5038712c4a4ef8923905a2ea1b8836a1affected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before 26bd1f210d3783a691052c51d76bb8a8bbd24c67affected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before 8c0980493beed3a80d6329c44ab293dc8c032927affected · git
- 2bc780499aa33311ec0f3e42624dfaa7be0ade5e and later · before ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30affected · git
- before 2.6.26not affected · semver
- 5.4.251 and later · up to and including 5.4.*not 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 6.1.52-1 | 6.1.52-1 |
| Debian:13 | linux | before 6.4.4-1 | 6.4.4-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- 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
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 26bd1f210d3783a691052c51d76bb8a8bbd24c67 | Vendor (CNA) |
| Linux Linux | 337fdce450637ea663bc816edc2ba81e5cdad02e | Vendor (CNA) |
| Linux Linux | 5c618daa5038712c4a4ef8923905a2ea1b8836a1 | Vendor (CNA) |
| Linux Linux | 8c0980493beed3a80d6329c44ab293dc8c032927 | Vendor (CNA) |
| Linux Linux | 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8 | Vendor (CNA) |
| Linux Linux | c052797ac36813419ad3bfa54cb8615db4b41f15 | Vendor (CNA) |
| Linux Linux | ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30 | Vendor (CNA) |
| debian:linux | 6.1.52-1 · 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
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/337fdce450637ea663bc816edc2ba81e5cdad02e
- git.kernel.org/stable/c/5c618daa5038712c4a4ef8923905a2ea1b8836a1
- git.kernel.org/stable/c/8c0980493beed3a80d6329c44ab293dc8c032927
- git.kernel.org/stable/c/9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8
- git.kernel.org/stable/c/c052797ac36813419ad3bfa54cb8615db4b41f15
- git.kernel.org/stable/c/ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30
Vendor advisories and official records. Exploit/PoC links are deliberately left out.