CVE-2026-80862
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.
How to fix
- Linux Linuxd19f98c79f1b7e09e4cdf5c20d626e571e487467, 64561afb42d8390695bf810d9bbd087cbca00291, 0a9750263ffacbbd2048a391fd4bd22e2146c57d, 6e4cf281558709b92ec2ca3054fe2ffc69266ef9, 36ac05f7cfd59d90c597071304b14e98090d5dd1, 6.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4e893ca8117022de68ce1b61c0309e3d17bb8a25 ≤ v < d19f98c79f1b7e09e4cdf5c20d626e571e487467, 4e893ca8117022de68ce1b61c0309e3d17bb8a25 ≤ v < 64561afb42d8390695bf810d9bbd087cbca00291, 4e893ca8117022de68ce1b61c0309e3d17bb8a25 ≤ v < 0a9750263ffacbbd2048a391fd4bd22e2146c57d, 4e893ca8117022de68ce1b61c0309e3d17bb8a25 ≤ v < 6e4cf281558709b92ec2ca3054fe2ffc69266ef9, 4e893ca8117022de68ce1b61c0309e3d17bb8a25 ≤ v < 36ac05f7cfd59d90c597071304b14e98090d5dd1, c57506918b078ecab7dedebef0f34dbc23ae2e46, 6.6.160 ≤ v < 6.7, 6.12 | d19f98c79f1b7e09e4cdf5c20d626e571e487467, 64561afb42d8390695bf810d9bbd087cbca00291, 0a9750263ffacbbd2048a391fd4bd22e2146c57d, 6e4cf281558709b92ec2ca3054fe2ffc69266ef9, 36ac05f7cfd59d90c597071304b14e98090d5dd1, 6.7 |
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