GHSA-wp3j-57qp-wwvh · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - fix packet...
In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - fix packet extraction from stream When processing TCP stream data in ovpn_tcp_recv, we receive large cloned skbs from __strp_rcv that may contain multiple coalesced packets. The current implementation has two bugs: 1. Header offset overflow: Using pskb_pull with large offsets on coalesced skbs causes skb->data - skb->head to exceed the u16 storage of skb->network_header. This causes skb_reset_network_header to fail on the inner decapsulated packet, resulting in packet drops. 2. Unaligned protocol headers: Extracting packets from arbitrary positions within the coalesced TCP stream provides no alignment guarantees for the packet data causing performance penalties on architectures without efficient unaligned access. Additionally, openvpn's 2-byte length prefix on TCP packets causes the subsequent 4-byte opcode and packet ID fields to be inherently misaligned. Fix both issues by allocating a new skb for each openvpn packet and using skb_copy_bits to extract only the packet content into the new buffer, skipping the 2-byte length prefix. Also, check the length before invoking the function that performs the allocation to avoid creating an invalid skb. If the packet has to be forwarded to userspace the 2-byte prefix can be pushed to the head safely, without misalignment. As a side effect, this approach also avoids the expensive linearization that pskb_pull triggers on cloned skbs with page fragments. In testing, this resulted in TCP throughput improvements of up to 74%.
総合評価: CVE-2026-43254 は中リスク（42.9/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.45%、36 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
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 | 0.05% | 0.45% | +0.40% |
| 2 | 2026-05-12 | 0.02% | 0.05% | +0.03% |
| 3 | 2026-05-07 | — | 0.02% | — |
EPSS の全履歴 （全 3 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
GHSA-wp3j-57qp-wwvh · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - fix packet...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2026-43254 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-43254 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2026-43254 |
suse
|
medium | CVE-2026-43254 severity moderate: SUSE including 16 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 116 product×package rows across 22 product lines (SUSE Linux Enterprise Micro 5.0, SUSE Linux Enterprise Micro 5.1, … (22 product lines)): Known Not Affected 116. | https://www.suse.com/security/cve/CVE-2026-43254/ |
ubuntu
|
medium | CVE-2026-43254 medium priority: Ubuntu including 161 source packages (linux, linux-allwinner-5.19, …), 1449 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1048, ignored 169, not-affected 125, released 83, needed 19, needs-triage 5. | https://ubuntu.com/security/CVE-2026-43254 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| linux | linux_kernel | >= 6.16, < 6.18.16 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.19, < 6.19.6 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | 7.0 | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |