net/sched: act_ct: preserve tc_skb_cb across defragmentation (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.58 % · percentile 48 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: preserve tc_skb_cb across defragmentation tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through act_ct therefore loses qdisc metadata such as pkt_segs and can trigger WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled. Save and restore the full tc_skb_cb around nf_ct_handle_fragments(), matching the pattern used by ovs_ct_handle_fragments().
Weaknesses (CWE)
- CWE-662 — Improper Synchronization
References
- https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6
- https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d
- https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c
- https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac
- https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d
- https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad
- https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | Linux |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-59015
- GCVE · GCVE-0-2026-72057
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1163 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 0d76daf2013ce1da20eab5e26bd81d983e1c18fb < fb080b6f54835d5d4d11ce3122800e6f0f6689e6 ; affected ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 67d6b00a54446c008f52cf70fc0c2ad0c712f85d ; affected ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 2400c4b05d58834b994500a9eec90a37db44187c ; affected ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac ; affected ec624fe740b416fb68d536b37fb8eef46f90b5c2 < b3d835407846134b0d54637c0281b39bebef831d ; affected ec624fe740b416fb68d536b37fb8eef46f90b5c2 < f7f45ceb855d9ba1cba594fb3f383255f7013fad |
| Linux · Linux | affected 5.16 ; unaffected 0 < 5.16 ; unaffected 5.15.217 ≤ 5.15.* ; unaffected 6.1.184 ≤ 6.1.* ; unaffected 6.6.145 ≤ 6.6.* ; unaffected 6.12.97 ≤ 6.12.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |