CVE-2026-45856High· 7.0▾ TwilightA flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the `ib_uverbs_post_send` function. A local user can exploit this vulnerability by providing an invalid work queue element size (`wqe_…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
Last analysed / modified upstream
0.2% → 0.2%
7.1 → 7
A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the ib_uverbs_post_send function. A local user can exploit this vulnerability by providing an invalid work queue element size (wqe_size) from userspace without proper validation. This can lead to an out-of-bounds read from kernel heap memory, potentially disclosing sensitive kernel information to the user. Additionally, an excessively large wqe_size could trigger a kernel warning.
kernel: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send — rated Moderate by Red Hat. Released 2026-05-27, updated 2026-10-26.
Affected:
Fixed:
No fix planned:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.
Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76738 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.
Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:74438 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.
Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:75747
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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