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fix(cve): CVE-2026-88807 - Check numSubpixel against numScreens to avoid OOB writes (CVE-2026-88807 #1

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fix(cve): CVE-2026-88807 - Check numSubpixel against numScreens to avoid OOB writes (CVE-2026-88807 #1

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9 changes: 9 additions & 0 deletions debian/changelog
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Original file line number Diff line number Diff line change
@@ -1,3 +1,12 @@
libxrender (1:0.9.10-1deepin1) unstable; urgency=medium

* fix(cve): CVE-2026-88807 (high) - Check numSubpixel against
numScreens to avoid OOB writes (CVE-2026-88807) Upstream:
https://gitlab.freedesktop.org/xorg/lib/libxrender/-
/merge_requests/19.patch

-- deepin-ci-robot <packages@deepin.org> Wed, 23 Sep 2026 16:31:54 +0800

libxrender (1:0.9.10-1) unstable; urgency=medium

[ Andreas Boll ]
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18 changes: 18 additions & 0 deletions debian/patches/CVE-2026-88807.patch
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Description: CVE-2026-88807 (high) - A malicious server could reply to XRenderQueryFormat with a numSubpixels count greater than the number of screens, causing an OOB write into screen->subpixel
Author: Peter Hutterer <peter.hutterer@who-t.net>
Origin: https://gitlab.freedesktop.org/xorg/lib/libxrender/-/merge_requests/19.patch
Bug: https://nvd.nist.gov/vuln/detail/CVE-2026-88807
Last-Update: 2026-09-16
---
diff --git a/src/Xrender.c b/src/Xrender.c
index 71cf3e6..b7754ff 100644
--- a/src/Xrender.c
+++ b/src/Xrender.c
@@ -464,6 +464,7 @@ XRenderQueryFormats (Display *dpy)
(rep.numDepths < ((INT_MAX / 4) / sizeof (XRenderDepth))) &&
(rep.numVisuals < ((INT_MAX / 4) / sizeof (XRenderVisual))) &&
(rep.numSubpixel < ((INT_MAX / 4) / 4)) &&
+ (rep.numSubpixel <= rep.numScreens) &&
(rep.length < (INT_MAX >> 2)) ) {
xri = Xmalloc (sizeof (XRenderInfo) +
(rep.numFormats * sizeof (XRenderPictFormat)) +
1 change: 1 addition & 0 deletions debian/patches/series
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CVE-2026-88807.patch
1 change: 1 addition & 0 deletions debian/source/format
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