Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/xe: Make dma-fences compliant with the safe access rules Xe can free some of… (CVE-2025-38703)
In the Linux kernel, the following vulnerability has been resolved: drm/xe: Make dma-fences compliant with the safe access rules Xe can free some of the data pointed to by the dma-fences it exports. Most notably the timeline name can get freed if userspace closes the associated submit queue. At the same time the fence could have been exported to a third party (for example a sync_fence fd) which will then cause an use- after-free on subsequent access. To make this safe we need to make the driver compliant with the newly documented dma-fence rules. Driver has to ensure a RCU grace period between signalling a fence and freeing any data pointed to by said fence. For the timeline name we simply make the queue be freed via kfree_rcu and for the shared lock associated with multiple queues we add a RCU grace period before freeing the per GT structure holding the lock.
AI Analysis
Technical Summary
This Red Hat security advisory (RHSA-2026:0793) covers five kernel vulnerabilities identified by CVE IDs CVE-2025-38703, CVE-2025-39933, CVE-2025-40277, CVE-2025-68285, and CVE-2025-68287. The issues affect various kernel subsystems: drm/xe dma-fences compliance with safe access rules; SMB client recv_done function verifying data_offset, data_length, and remaining_data_length; drm/vmwgfx command header size validation against SVGA_CMD_MAX_DATASIZE; a race condition in usb dwc3 between concurrent dwc3_remove_requests() calls; and a potential use-after-free in libceph's have_mon_and_osd_map(). Red Hat has released updated kernel packages for Red Hat Enterprise Linux 9 and related variants. The advisory instructs users to apply the update and reboot systems to mitigate these vulnerabilities.
Potential Impact
The vulnerabilities affect the Linux kernel core components, potentially leading to unsafe memory access, race conditions, and use-after-free bugs. These issues could result in system instability, privilege escalation, or denial of service if exploited. The advisory classifies the overall impact as important (high severity). No known exploits in the wild have been reported at the time of publication.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 9 as described in the advisory (https://access.redhat.com/articles/11258) and reboot their systems to ensure the fixes take effect. This is the official and recommended remediation.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/xe: Make dma-fences compliant with the safe access rules Xe can free some of… (CVE-2025-38703)
Description
In the Linux kernel, the following vulnerability has been resolved: drm/xe: Make dma-fences compliant with the safe access rules Xe can free some of the data pointed to by the dma-fences it exports. Most notably the timeline name can get freed if userspace closes the associated submit queue. At the same time the fence could have been exported to a third party (for example a sync_fence fd) which will then cause an use- after-free on subsequent access. To make this safe we need to make the driver compliant with the newly documented dma-fence rules. Driver has to ensure a RCU grace period between signalling a fence and freeing any data pointed to by said fence. For the timeline name we simply make the queue be freed via kfree_rcu and for the shared lock associated with multiple queues we add a RCU grace period before freeing the per GT structure holding the lock.
CVSS v3.1
Score 7.8high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory (RHSA-2026:0793) covers five kernel vulnerabilities identified by CVE IDs CVE-2025-38703, CVE-2025-39933, CVE-2025-40277, CVE-2025-68285, and CVE-2025-68287. The issues affect various kernel subsystems: drm/xe dma-fences compliance with safe access rules; SMB client recv_done function verifying data_offset, data_length, and remaining_data_length; drm/vmwgfx command header size validation against SVGA_CMD_MAX_DATASIZE; a race condition in usb dwc3 between concurrent dwc3_remove_requests() calls; and a potential use-after-free in libceph's have_mon_and_osd_map(). Red Hat has released updated kernel packages for Red Hat Enterprise Linux 9 and related variants. The advisory instructs users to apply the update and reboot systems to mitigate these vulnerabilities.
Potential Impact
The vulnerabilities affect the Linux kernel core components, potentially leading to unsafe memory access, race conditions, and use-after-free bugs. These issues could result in system instability, privilege escalation, or denial of service if exploited. The advisory classifies the overall impact as important (high severity). No known exploits in the wild have been reported at the time of publication.
Mitigation Recommendations
Red Hat has released updated kernel packages that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 9 as described in the advisory (https://access.redhat.com/articles/11258) and reboot their systems to ensure the fixes take effect. This is the official and recommended remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:0793
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-39933","CVE-2025-40277","CVE-2025-68285","CVE-2025-68287"]
Threat ID: 6a3da1ca4853345fc18224b7
Added to database: 06/25/2026, 21:46:50 UTC
Last enriched: 06/25/2026, 22:02:19 UTC
Last updated: 09/10/2026, 19:24:56 UTC
Views: 149
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