net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked When taprio's software path peeks a non-work-conserving child qdisc, the child stashes the peeked skb in its gso_skb; taprio_dequeue_from_txq() then takes the packet with a direct child ->dequeue() call, which ignores that stash, orphans the peeked skb and desyncs the child's qlen/backlog. With a qfq child this re-enters the child on an emptied list and dereferences NULL, panicking the kernel from softirq on ordinary egress. Take the packet through qdisc_dequeue_peeked(), as sch_red and sch_sfb now do. The helper returns the child's stashed skb first and is a no-op when there is none, so a work-conserving child is unaffected and the gated path now consumes the skb whose length was charged to the budget.
- Published
- Aug 15, 2026
- Updated
- Aug 23, 2026
- EPSS
- 0.6% · 47th percentile
- CWE
- —
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 8.2
- 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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; 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 helpAffected systems
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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
- 4.20affected
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before 51f8af240aed903e988755af33d7491030b50ae9affected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before 17ab5f76f3899f67e5569722f334591f4b88b17baffected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before f60d5c12e0551012cee5c272b0bcbcc78f7bb506affected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before 6ee5a7665a9080bcb05d703bf981a579436fd05eaffected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before 18d580cb00c55805633bae45e90cf22ed6b8e424affected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09affected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6affected · git
- 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 and later · before e056e1dfcddca877dd46d704e8ec9860cfc9ec44affected · git
- before 4.20not 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:13 | linux | before 6.12.100-1 | 6.12.100-1 |
| Debian:14 | linux | before 7.1.5-1 | 7.1.5-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- 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 | 17ab5f76f3899f67e5569722f334591f4b88b17b | Vendor (CNA) |
| Linux Linux | 18d580cb00c55805633bae45e90cf22ed6b8e424 | Vendor (CNA) |
| Linux Linux | 2dcebbd1ad2e180fe7b98bf346ced69a872e11e6 | Vendor (CNA) |
| Linux Linux | 51f8af240aed903e988755af33d7491030b50ae9 | Vendor (CNA) |
| Linux Linux | 6ee5a7665a9080bcb05d703bf981a579436fd05e | Vendor (CNA) |
| Linux Linux | e056e1dfcddca877dd46d704e8ec9860cfc9ec44 | Vendor (CNA) |
| Linux Linux | e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09 | Vendor (CNA) |
| Linux Linux | f60d5c12e0551012cee5c272b0bcbcc78f7bb506 | Vendor (CNA) |
| debian:linux | 6.1.187-1 · 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
- 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
- low · 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
- None
- Integrity impact
- Low
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/17ab5f76f3899f67e5569722f334591f4b88b17b
- git.kernel.org/stable/c/18d580cb00c55805633bae45e90cf22ed6b8e424
- git.kernel.org/stable/c/2dcebbd1ad2e180fe7b98bf346ced69a872e11e6
- git.kernel.org/stable/c/51f8af240aed903e988755af33d7491030b50ae9
- git.kernel.org/stable/c/6ee5a7665a9080bcb05d703bf981a579436fd05e
- git.kernel.org/stable/c/e056e1dfcddca877dd46d704e8ec9860cfc9ec44
- git.kernel.org/stable/c/e2b7ee61989f2d39df6c2cc06f9db1aea69bdb09
- git.kernel.org/stable/c/f60d5c12e0551012cee5c272b0bcbcc78f7bb506
Vendor advisories and official records. Exploit/PoC links are deliberately left out.