High
Xorg: xwayland: use-after-free in syncinittrigger()
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-26601
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:32 UTC · Revision 1
Source evidence
Xorg: xwayland: use-after-free in syncinittrigger()
core-osv · Original sourcePublished 25 Feb 2025, 15:55 UTC
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.
osv:CVE-2025-26601
Complete source record
{
"id": "c606e6546dcee36093ec0406c21f872b03c9e0aabbbc6742c775e39920e56352",
"url": "https://osv.dev/vulnerability/CVE-2025-26601",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Xorg: xwayland: use-after-free in syncinittrigger()",
"summary": "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.",
"evidence": "osv:CVE-2025-26601",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2025-26601",
"aliases": [
"CVE-2025-26601"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.freedesktop.org/xorg/xserver",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b7f84e6d509c004a7abb514af75b94cb907d451b"
},
{
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}
],
"database_specific": {
"extracted_events": [
{
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{
"introduced": "0"
},
{
"fixed": "21.1.16"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
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},
{
"fixed": "24.1.6"
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],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
],
"versions": [
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"xorg-server-1.6.99.901",
"xorg-server-1.6.99.900",
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"xorg-server-1_1_99_2",
"xorg-server-1_0_99_901",
"XORG-7_0_99_901",
"xorg-server-1_1_99_1",
"xorg-server-1_0_99_2",
"xorg-server-1_0_99_1",
"XORG-7_0",
"pre-xgldrop-merge",
"XORG-6_99_99_904",
"MODULAR_COPY",
"XORG-6_99_99_903",
"XORG-6_8_99_903",
"DRM-2_0_0",
"XORG-6_99_99_902",
"XORG-6_8_99_902",
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"DRM-20051017",
"kdrive-initial-import",
"xorg-server-0_99_1",
"XORG-6_99_99_900",
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"XORG-6_8_99_16",
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"DRM-20050615",
"sco_port_update-base",
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"xf86-4_3_0_1",
"PRE_xf86-4_3_0_1",
"XORG-MAIN",
"xfixes_2_branchpoint",
"keithp",
"xf-4_3_99_6",
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"xf-4_3_99_2",
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"xf-4_3_0_1",
"xf-4_3_0",
"xf-4_2_99_902",
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"ah-20021030",
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"xf-4_2_99_1",
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"xf-4_2_0-bindist-1",
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"xf-4_2_0",
"xf-4_2-bp",
"xf-4_1_99_7",
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-26601.json"
}
}
],
"modified": "2026-10-28T02:30:37.622179540Z",
"provider": "osv",
"references": [
"https://access.redhat.com/downloads/content/package-browser/",
"https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html",
"https://access.redhat.com/errata/RHSA-2025:2500",
"https://access.redhat.com/errata/RHSA-2025:2502",
"https://access.redhat.com/errata/RHSA-2025:2861",
"https://access.redhat.com/errata/RHSA-2025:2862",
"https://access.redhat.com/errata/RHSA-2025:2865",
"https://access.redhat.com/errata/RHSA-2025:2866",
"https://access.redhat.com/errata/RHSA-2025:2873",
"https://access.redhat.com/errata/RHSA-2025:2874",
"https://access.redhat.com/errata/RHSA-2025:2875",
"https://access.redhat.com/errata/RHSA-2025:2879",
"https://access.redhat.com/errata/RHSA-2025:2880",
"https://access.redhat.com/errata/RHSA-2025:3976",
"https://access.redhat.com/errata/RHSA-2025:7163",
"https://access.redhat.com/errata/RHSA-2025:7165",
"https://access.redhat.com/errata/RHSA-2025:7458",
"https://access.redhat.com/security/cve/CVE-2025-26601",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26601.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-26601",
"https://security.netapp.com/advisory/ntap-20250516-0004/",
"https://bugzilla.redhat.com/show_bug.cgi?id=2345251",
"https://gitlab.freedesktop.org/xorg/xserver/"
],
"provider_metadata": {
"cwe_ids": [
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],
"cna_assigner": "redhat",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "0:24.1.5-3.el10_0"
},
{
"fixed": "0:1.1.0-25.el6_10"
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{
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{
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{
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{
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{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "InverseAffectedRanges"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26601.json"
}
},
"related_cves": [
{
"value": "CVE-2025-26601",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504718,
"published_at": "2025-02-25T15:55:36.775+00:00"
}