A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.
総合評価: CVE-2023-3138 は中リスク（56.1/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 1.67%、74 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 | 2026-06-16 | 1.39% | 1.67% | +0.28% |
| 2 | 2026-06-15 | 0.11% | 1.39% | +1.28% |
| 3 | 2025-11-29 | — | 0.11% | — |
EPSS の全履歴 （全 16 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 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-3138: 1 source package rows (libx11); 22 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 2, open 20. | https://security.alpinelinux.org/vuln/CVE-2023-3138 |
debian
|
not yet assigned | CVE-2023-3138 not yet assigned priority: Debian including 1 source packages (libx11), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2023-3138 |
gentoo
|
normal | CVE-2023-3138: 1 GLSA(s) (202407-21), 1 atom(s) (x11-libs/libX11); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-3138 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2023-3138 |
suse
|
high | CVE-2023-3138 severity important: SUSE including 290 source package names (11-6.9:libX11-6-1.6.5-150000.3.30.1, 11-6.9:libX11-data-1.6.5-150000.3.30.1, …), 814 product×package rows across 174 product lines (Container bci/openjdk, Container bci/openjdk-devel, … (174 product lines)): Fixed 583, Known Affected 231. | https://www.suse.com/security/cve/CVE-2023-3138/ |
ubuntu
|
medium | CVE-2023-3138 medium priority: Ubuntu including 1 source packages (libx11), 8 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): released 8. | https://ubuntu.com/security/CVE-2023-3138 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| x.org | libx11 | < 1.8.6 | cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 8.0 | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 9.0 | cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* |