GHSA-8hp2-qmc6-f97h · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the...
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.
総合評価: CVE-2026-31709 は中リスク（42.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.28%、20 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% | 0.28% | +0.23% |
| 2 | 2026-06-02 | 0.02% | 0.05% | +0.03% |
| 3 | 2026-05-02 | — | 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 |
|---|---|---|---|---|---|---|
| 8.8 | 3.1 | HIGH |
|
2.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
GHSA-8hp2-qmc6-f97h · 深刻度： high — In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2026-31709 unimportant 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-2026-31709 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-31709 |
suse
|
high | — | https://www.suse.com/security/cve/CVE-2026-31709/ |
ubuntu
|
medium | CVE-2026-31709 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, needed 99, released 83, not-affected 45, needs-triage 4, pending 1. | https://ubuntu.com/security/CVE-2026-31709 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| linux | linux_kernel | >= 5.12, < 7.0.2 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |