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CVE-2026-89973

nvme-tcp: check the data direction of a C2HData PDU PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: check the data direction of a C2HData PDU nvme_tcp_handle_c2h_data() finds the request by command id and checks that it has a payload, but it does not check that the command asked for data to be read. A controller that answers a write command with C2HData therefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits WARN_ON_ONCE(i->data_source) and returns 0. The receive path turns that into -EFAULT and resets the controller. No data is copied, so this is not memory corruption. What a controller gets is a kernel warning it can raise at will, which is fatal on a host booted with panic_on_warn. The send path already knows the direction - it consults rq_data_dir() when it builds a command - and nvme_tcp_handle_r2t() checks the length and the offset of the request it names. The C2HData path does not check the direction at all. Reject a C2HData PDU whose command is not a read. Rejecting it fails the command and resets the controller, as the neighbouring check in this function does; what goes away is the warning. [ 6.885580] ------------[ cut here ]------------ [ 6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71 [ 6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy) [ 6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work [ 6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330 [ 6.903739] Call Trace: [ 6.904085] <TASK> [ 6.909254] __skb_datagram_iter+0x433/0x820 [ 6.911026] skb_copy_datagram_iter+0x37/0x120 [ 6.911622] nvme_tcp_recv_skb+0xa07/0x4320 [ 6.913378] __tcp_read_sock+0x1ab/0x810 [ 6.915788] nvme_tcp_try_recv+0x152/0x1e0 [ 6.918222] nvme_tcp_io_work+0x1e4/0x6c0 [ 6.926906] </TASK> [ 6.927226] ---[ end trace 0000000000000000 ]--- [ 6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data [ 6.928709] nvme nvme0: receive failed: -14

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before df74950ba6008655d4a977d17df7faf4b6e52b74; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 980d990f3c0560d7dfbfbf14699651fdf02f26ee; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 5b115d932f6e769ac80783fb18edd21b0aed256e; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 0673a2affe45ca76b60de31a83c67b1e60f81bde; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 80d56202fbdff8906be6954b2776e5c14a4026f2; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before b4af7999a998787d5eb6facb5a333e04a4f1d2d9; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before a0c389b8a495bda1eb719d2503853c924b7a8355; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before f83af377c148f6ad94b41c0e8313f12adf45e1c1
Linux / Linuxaffected 5.0; unaffected 0 before 5.0; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References