Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix usage of page_frag_cache nvme uses page_frag_cache to preallocate PDU for each preallocated request of block device. Block devices are created in parallel threads, consequently page_frag_cache is used in not thread-safe manner. That leads to incorrect refcounting of backstore pages and premature free. That can be catched by !sendpage_ok inside network stack: WARNING: CPU: 7 PID: 467 at ../net/core/skbuff.c:6931 skb_splice_from_iter+0xfa/0x310. tcp_sendmsg_locked+0x782/0xce0 tcp_sendmsg+0x27/0x40 sock_sendmsg+0x8b/0xa0 nvme_tcp_try_send_cmd_pdu+0x149/0x2a0 Then random panic may occur. Fix that by serializing the usage of page_frag_cache.
References
- https://git.kernel.org/stable/c/0a9750263ffacbbd2048a391fd4bd22e2146c57d
- https://git.kernel.org/stable/c/36ac05f7cfd59d90c597071304b14e98090d5dd1
- https://git.kernel.org/stable/c/64561afb42d8390695bf810d9bbd087cbca00291
- https://git.kernel.org/stable/c/6e4cf281558709b92ec2ca3054fe2ffc69266ef9
- https://git.kernel.org/stable/c/d19f98c79f1b7e09e4cdf5c20d626e571e487467
FAQ
What is CVE-2026-80862?
CVE-2026-80862 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix usage of page_frag_cache nvme uses page_frag_cache to preallocate PDU for each preallocated request of block device....
How severe is CVE-2026-80862?
CVSS scoring is not yet available for CVE-2026-80862. Check NVD for updates.
Is there a patch for CVE-2026-80862?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.