GHSA-7cwq-2xv8-7cqw · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql...
In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql can only be used as root qdisc Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint. Although not important, I will describe the scenario that unearthed this issue for the curious. GangMin Kim <[email protected]> managed to concot a scenario as follows: ROOT qdisc 1:0 (QFQ) ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s └── class 1:2 (weight=1, lmax=1514) teql GangMin sends a packet which is enqueued to 1:1 (netem). Any invocation of dequeue by QFQ from this class will not return a packet until after 6.4s. In the meantime, a second packet is sent and it lands on 1:2. teql's enqueue will return success and this will activate class 1:2. Main issue is that teql only updates the parent visible qlen (sch->q.qlen) at dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's peek always returns NULL), dequeue will never be called and thus the qlen will remain as 0. With that in mind, when GangMin updates 1:2's lmax value, the qfq_change_class calls qfq_deact_rm_from_agg. Since the child qdisc's qlen was not incremented, qfq fails to deactivate the class, but still frees its pointers from the aggregate. So when the first packet is rescheduled after 6.4 seconds (netem's delay), a dangling pointer is accessed causing GangMin's causing a UAF.
総合評価: CVE-2026-23074 は低リスク（32.3/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.13%、3 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.02% | 0.13% | +0.11% |
| 2 | 2026-02-05 | — | 0.02% | — |
EPSS の全履歴 （全 2 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | [email protected] |
| 7.0 | 3.1 | HIGH |
|
1.0 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
GHSA-7cwq-2xv8-7cqw · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-23074 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. | https://security-tracker.debian.org/tracker/CVE-2026-23074 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-23074 |
suse
|
high | — | https://www.suse.com/security/cve/CVE-2026-23074/ |
ubuntu
|
medium | CVE-2026-23074 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1413 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1018, released 199, ignored 169, not-affected 11, needed 8, pending 8. | https://ubuntu.com/security/CVE-2026-23074 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| linux | linux_kernel | >= 2.6.12.1, < 5.10.249 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 5.11, < 5.15.199 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 5.16, < 6.1.162 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.2, < 6.6.122 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.7, < 6.12.68 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.13, < 6.18.8 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | 2.6.12 | cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* |
| linux | linux_kernel | 2.6.12 | cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* |
| linux | linux_kernel | 2.6.12 | cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* |
| linux | linux_kernel | 2.6.12 | cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* |
| linux | linux_kernel | 2.6.12 | cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* |
| linux | linux_kernel | 6.19 | cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* |