CVE-2026-98017net/sched: defer qdisc freeing after failed creation
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: defer qdisc freeing after failed creation An RTM_NEWQDISC request can make clsact bind a populated shared ingress block during ->init(), publishing an embedded mini_Qdisc to lockless readers. If the same request has an invalid TCA_RATE, estimator setup fails after ->init(); the unwind removes the pointer but synchronously frees its containing qdisc while tc_run() may still hold it. Retire failed qdiscs through the same RCU helper as normal destruction. Inline the synchronous free into the callback now that no direct callers remain.
Timeline
ID reserved
By Linux
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < 96a27a3e64e7c87abade03fb2ad04ed66992a89a
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < 6a1b49bb9fdf9e8e7aa38e8cd635c0cc4074447d
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < 20bf6fa34b345333971bd4464a322cce87b83f4e
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < 156a3bab69744e9225bb9eff8c5cc53da18d5a2e
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < 5bfe927c5b4b290fad529186218c728589b4b101
- affected 51ab2994c387c80b45caf8b8067b3f3b97771d25 – < e6662f2100f8d33b0f4d0047c219efd6bba186ea
- affected 4.16
- unaffected < 4.16
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/96a27a3e64e7c87abade03fb2ad04ed66992a89a (opens in a new tab)
- https://git.kernel.org/stable/c/6a1b49bb9fdf9e8e7aa38e8cd635c0cc4074447d (opens in a new tab)
- https://git.kernel.org/stable/c/20bf6fa34b345333971bd4464a322cce87b83f4e (opens in a new tab)
- https://git.kernel.org/stable/c/156a3bab69744e9225bb9eff8c5cc53da18d5a2e (opens in a new tab)
- https://git.kernel.org/stable/c/5bfe927c5b4b290fad529186218c728589b4b101 (opens in a new tab)
- https://git.kernel.org/stable/c/e6662f2100f8d33b0f4d0047c219efd6bba186ea (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86670 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98017)Record last updated .