{"id":"CVE-2026-89973","revision":null,"records":[{"revision":"73feaa0074bd4a8c92ac896bf46fe4cc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89973","aliases":[],"title":"nvme-tcp: check the data direction of a C2HData PDU","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read. A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i->data_source) and returns 0. The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption. What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names. The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read. Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n [ 6.885580] ------------[ cut here ]------------\n [ 6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n [ 6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n [ 6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n [ 6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n [ 6.903739] Call Trace:\n [ 6.904085] \n [ 6.909254] __skb_datagram_iter+0x433/0x820\n [ 6.911026] skb_copy_datagram_iter+0x37/0x120\n [ 6.911622] nvme_tcp_recv_skb+0xa07/0x4320\n [ 6.913378] __tcp_read_sock+0x1ab/0x810\n [ 6.915788] nvme_tcp_try_recv+0x152/0x1e0\n [ 6.918222] nvme_tcp_io_work+0x1e4/0x6c0\n [ 6.926906] \n [ 6.927226] ---[ end trace 0000000000000000 ]---\n [ 6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n [ 6.928709] nvme nvme0: receive failed: -14","state":0,"publishedAt":"2026-09-16T10:32:52.409+00:00","modifiedAt":"2026-10-19T08:55:48.143+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/nvme/host/tcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"df74950ba6008655d4a977d17df7faf4b6e52b74\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"980d990f3c0560d7dfbfbf14699651fdf02f26ee\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"5b115d932f6e769ac80783fb18edd21b0aed256e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"0673a2affe45ca76b60de31a83c67b1e60f81bde\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"80d56202fbdff8906be6954b2776e5c14a4026f2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"b4af7999a998787d5eb6facb5a333e04a4f1d2d9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"a0c389b8a495bda1eb719d2503853c924b7a8355\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\n \"lessThan\": \"f83af377c148f6ad94b41c0e8313f12adf45e1c1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/nvme/host/tcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.51\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.5\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","score":8.2,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74","https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee","https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e","https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde","https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2","https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9","https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355","https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89973","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89973","identifiers":["CVE-2026-89973"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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