A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
総合評価: CVE-2025-26601 は中リスク（40.9/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.35%、27 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 | 0.02% | 0.35% | +0.33% |
| 2 | 2026-04-05 | 0.05% | 0.02% | -0.03% |
| 3 | 2025-12-22 | — | 0.05% | — |
EPSS の全履歴 （全 6 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 | [email protected] |
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-26601: 2 source package rows (xorg-server, xwayland); 6 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 6, open 0. | https://security.alpinelinux.org/vuln/CVE-2025-26601 |
debian
|
not yet assigned | CVE-2025-26601 not yet assigned priority: Debian including 2 source packages (xorg-server, xwayland), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 1. | https://security-tracker.debian.org/tracker/CVE-2025-26601 |
gentoo
|
high | CVE-2025-26601: 1 GLSA(s) (202506-04), 2 atom(s) (x11-base/xorg-server, x11-base/xwayland); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-26601 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2025-26601 |
suse
|
high | CVE-2025-26601 severity important: SUSE including 310 source package names (21:xorg-x11-server-21.1.11-150600.5.6.1, 21:xorg-x11-server-Xvfb-21.1.11-150600.5.6.1, …), 394 product×package rows across 58 product lines (Container suse/kiosk/xorg, Image SLES15-SP3-SAPCAL-Azure, … (58 product lines)): Known Affected 231, Fixed 162, Known Not Affected 1. | https://www.suse.com/security/cve/CVE-2025-26601/ |
ubuntu
|
medium | CVE-2025-26601 medium priority: Ubuntu including 7 source packages (xorg, xorg-hwe-16.04, …), 58 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 25, released 17, not-affected 13, needs-triage 3. | https://ubuntu.com/security/CVE-2025-26601 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| tigervnc | tigervnc | — | cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:* |
| x.org | x_server | < 21.1.16 | cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* |
| x.org | xwayland | < 24.1.6 | cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 7.0 | cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* |
| 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:*:*:*:*:*:*:* |