CVE-2026-72465: xprtrdma: Sanitize the reply credit grant after parsing
In the Linux kernel, the following vulnerability has been resolved:
xprtrdma: Sanitize the reply credit grant after parsing
The outnorqst exit in rpcrdmareplyhandler() branches away before the credit clamp, so a reply that matches no pending request reaches outpost carrying the raw credit value parsed from the wire. rpcrdmapostrecvs() does not bound its @needed argument: the refill loop allocates and chains Receive WRs until the count is satisfied or allocation fails. A peer that sends a well-formed reply carrying an unknown XID and an inflated credit grant therefore drives rep allocation and Receive posting past remaxrequests on every such reply.
Move the clamp to immediately after the credit field is parsed, ahead of the first branch that can reach outpost, so every later consumer sees a sanitized value. The cwnd update stays on the matched-request path.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
linux/Kernelto a version that resolves this vulnerability.Fixed in 7.1.5 - Compensating control
Apply the fix described in the xprtrdma: Sanitize the reply credit grant after parsing change by ensuring the reply credit value parsed from the wire is clamped immediately after the credit field is parsed, so later Receive posting past re_max_requests and inflated credit grants cannot occur.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72465?
CVE-2026-72465 has a risk rating of 45, indicating a moderate security concern.
How do I fix CVE-2026-72465?
To resolve CVE-2026-72465, ensure you upgrade to the latest version of the Linux kernel that incorporates the patch for this vulnerability.
What type of vulnerability is CVE-2026-72465?
CVE-2026-72465 is a vulnerability in the Linux kernel related to improper handling of reply credits in the xprtrdma subsystem.
What versions of Linux are affected by CVE-2026-72465?
CVE-2026-72465 affects specific versions of the Linux kernel that use the xprtrdma communication protocol.
Is CVE-2026-72465 exploitable remotely?
Yes, CVE-2026-72465 may be exploitable remotely under certain conditions due to its nature within the networking stack.