bpf: Reject negative optlen in cgroup getsockopt hook
Noroxi assessment
Priority: Monitor (action score 0/100)
- 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: 0.22% (FIRST EPSS).
- Fixed version: Linux Linux 1b5aacd5b2419b0790e955e466d389a61c79b4b1, 2bdbe00454200fcb0110f31eeca8d906a3515e74, 31a89af4f513d750fec196e2bb6195a7d4473e9f.
Low priority for now. Upgrade to Linux Linux 1b5aacd5b2419b0790e955e466d389a61c79b4b1, 2bdbe00454200fcb0110f31eeca8d906a3515e74, 31a89af4f513d750fec196e2bb6195a7d4473e9f 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: bpf: Reject negative optlen in cgroup getsockopt hook A cgroup getsockopt BPF program can shrink ctx->optlen after the kernel getsockopt handler has run. The kernel-buffer variant, used by TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original length. If BPF writes a negative optlen, that value is accepted and propagated back to the TCP getsockopt code. It can then be passed to copy_to_sockptr() as a size_t and trigger the hardened usercopy bytes > INT_MAX warning. Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(), matching the lower-bound validation already present in the sockptr-based getsockopt hook.
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- EPSS
- 0.2% · 11th percentile
- CWE
- —
Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
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.
—
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
- 5.12affected
- 08f61a34913558e06576e7b6318bf583f273c1be and later · before 5b09d984b38b018b123c3a9e02a96bbc6468dbe5affected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before 554ba7195c4108726450e24480c8449990c2268caffected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before d02a12b4085ffe41ea750b1007f7a9c7aee2875aaffected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2affected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before f68671b1a98d426c57864bd457c125fee14ac1a5affected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before 2bdbe00454200fcb0110f31eeca8d906a3515e74affected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before 31a89af4f513d750fec196e2bb6195a7d4473e9faffected · git
- 9cacf81f8161111db25f98e78a7a0e32ae142b3f and later · before 1b5aacd5b2419b0790e955e466d389a61c79b4b1affected · git
- 5.10.188 and later · before 5.10.270affected · 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 | all versions | — |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.6-1 | 7.2.6-1 |
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 | 1b5aacd5b2419b0790e955e466d389a61c79b4b1 | Vendor (CNA) |
| Linux Linux | 2bdbe00454200fcb0110f31eeca8d906a3515e74 | Vendor (CNA) |
| Linux Linux | 31a89af4f513d750fec196e2bb6195a7d4473e9f | Vendor (CNA) |
| Linux Linux | 5.10.270 | Vendor (CNA) |
| Linux Linux | 554ba7195c4108726450e24480c8449990c2268c | Vendor (CNA) |
| Linux Linux | 5b09d984b38b018b123c3a9e02a96bbc6468dbe5 | Vendor (CNA) |
| Linux Linux | d02a12b4085ffe41ea750b1007f7a9c7aee2875a | Vendor (CNA) |
| Linux Linux | e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2 | Vendor (CNA) |
| Linux Linux | f68671b1a98d426c57864bd457c125fee14ac1a5 | Vendor (CNA) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~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
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
—
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74
- git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f
- git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c
- git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5
- git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a
- git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2
- git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5
Vendor advisories and official records. Exploit/PoC links are deliberately left out.