CVE-2026-92495: Linux kernel · RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to clear the VM_MAYWRITE flag before vm_insert_page() in the affected code path. Users should apply the official kernel updates that include this patch to remediate the vulnerability. Since this is a kernel-level issue, updating to a patched kernel version is the recommended mitigation.
Description
A vulnerability in the Linux kernel's RDMA bnxt_re driver was resolved by clearing the VM_MAYWRITE flag on certain memory mappings. The issue allowed a read-only mapping to retain VM_MAYWRITE, enabling a bypass of the write check that only runs at mmap time. This could allow userspace to gain write permissions via mprotect after the initial mapping. The fix ensures VM_MAYWRITE is cleared before vm_insert_page() for the shared DBR/toggle-page branch, aligning with the intended policy that userspace writes are not expected for these pages.
References
- ubuntu.com/security/CVE-2026-92495 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-92495 (opens in a new tab)
- git.kernel.org/linus/9b66c9af7172ffcf727214fa0ebe9a5e1ed6eb16 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-92495.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)