CVE-2026-80862

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4e893ca8117022de68ce1b61c0309e3d17bb8a25 < d19f98c79f1b7e09e4cdf5c20d626e571e487467affected
LinuxLinux4e893ca8117022de68ce1b61c0309e3d17bb8a25 < 64561afb42d8390695bf810d9bbd087cbca00291affected
LinuxLinux4e893ca8117022de68ce1b61c0309e3d17bb8a25 < 0a9750263ffacbbd2048a391fd4bd22e2146c57daffected
LinuxLinux4e893ca8117022de68ce1b61c0309e3d17bb8a25 < 6e4cf281558709b92ec2ca3054fe2ffc69266ef9affected
LinuxLinux4e893ca8117022de68ce1b61c0309e3d17bb8a25 < 36ac05f7cfd59d90c597071304b14e98090d5dd1affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.108 <= 6.12.*unaffected
LinuxLinux6.18.49 <= 6.18.*unaffected
LinuxLinux7.1.13 <= 7.1.*unaffected
LinuxLinux7.2.3 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References