{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89482", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.712Z", "datePublished": "2026-09-11T19:43:37.236Z", "dateUpdated": "2026-10-19T08:47:32.356Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:32.356Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone\n\nCommit 25e5cb780e62 (\"nvme-tcp: fix possible crash in write_zeroes\nprocessing\") established that blk_rq_payload_bytes() must not be read\nwithout first checking blk_rq_nr_phys_segments(), and recorded the\nresult in nvme_tcp_setup_cmd_pdu() as req->data_len. The receive side\nwas left as it was.\n\nThe two differ for REQ_OP_WRITE_ZEROES, which has no physical segments\nbut a non-zero blk_rq_bytes(), so setup leaves req->iter untouched\nwhile the receive gate lets a C2HData through and nvme_tcp_recv_data()\ncopies into whatever the previous command on that tag left there. The\ndriver-private area is zeroed only when the tag set is allocated.\n\nReproduced with a test target that leaves a residual iterator on a tag\nand then sends a C2HData for a WRITE_ZEROES command on the same tag:\n\nBUG: KASAN: wild-memory-access in _copy_to_iter+0x642/0x1330\nWrite of size 512 at addr ffe728c2175dfa81 by task kworker/0:1H/103\n\nCPU: 0 UID: 0 PID: 103 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nWorkqueue: nvme_tcp_wq nvme_tcp_io_work\nCall Trace:\n \n dump_stack_lvl+0x53/0x70\n kasan_report+0xce/0x100\n ? _copy_to_iter+0x642/0x1330\n kasan_check_range+0x105/0x1b0\n __asan_memcpy+0x3c/0x60\n _copy_to_iter+0x642/0x1330\n ? __pfx_sock_has_perm+0x10/0x10\n ? worker_thread+0x45b/0xd10\n ? __pfx__copy_to_iter+0x10/0x10\n ? _raw_spin_lock_bh+0x83/0xe0\n ? __pfx__raw_spin_lock_bh+0x10/0x10\n __skb_datagram_iter+0xf3/0x820\n ? __pfx_simple_copy_to_iter+0x10/0x10\n ? __asan_memcpy+0x3c/0x60\n ? skb_copy_bits+0x58d/0x830\n skb_copy_datagram_iter+0x37/0x120\n nvme_tcp_recv_skb+0xa07/0x4320\n ? __pfx_nvme_tcp_recv_skb+0x10/0x10\n __tcp_read_sock+0x1ab/0x810\n ? __pfx_nvme_tcp_recv_skb+0x10/0x10\n ? __pfx_lock_sock_nested+0x10/0x10\n ? __pfx___tcp_read_sock+0x10/0x10\n nvme_tcp_try_recv+0x152/0x1e0\n ? __pfx_nvme_tcp_try_recv+0x10/0x10\n ? __pfx_mutex_unlock+0x10/0x10\n nvme_tcp_io_work+0x1e4/0x6c0\n ? __schedule+0x181a/0x49f0\n ? __pfx_nvme_tcp_io_work+0x10/0x10\n process_one_work+0x633/0x1030\n\nKeep the blk_rq_payload_bytes() test and add req->data_len to it. The\nold test is what rejects a C2HData naming a tag that is no longer in\nflight, because blk_update_request() zeroes rq->__data_len on\ncompletion; req->data_len and req->curr_bio are driver-private and\nsurvive completion, so they cannot stand in for it. Setup initialises\nthe iterator only when both req->curr_bio and req->data_len are set, so\nthe gate now tests the same two." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The nvme-tcp host receive path parses C2HData PDUs from a remote NVMe/TCP target over a routable TCP connection (typically port 4420); a malicious or compromised target, or an on-path attacker injecting into the stream, triggers the bug from the network.\nAC:L - A malicious target can advertise WRITE_ZEROES, wait for tag reuse after a data command, and send C2HData for that in-flight WRITE_ZEROES; leftover iterator state is deterministic because driver-private fields are not cleared on reuse, so no race or memory-layout luck is required.\nPR:N - NVMe/TCP authentication (TLS, DH-HMAC-CHAP) is optional and off by default; the vulnerable copy runs on C2HData from the connected peer, which needs no credentials or privileges on the victim host.\nUI:N - Once the host is connected to the target as persistent storage, ordinary filesystem and block I/O generate WRITE_ZEROES commands; the attacker sends the crafted PDU without any further victim action.\nS:U - The stale-iterator write corrupts memory in the same host kernel security authority; this is not a VM, IOMMU, or sandbox boundary crossing.\nC:H - nvme_tcp_recv_data() writes attacker-controlled C2HData through a leftover iov_iter into pages from a previously completed command on the same tag, a use-after-free of those buffers that can be turned into an arbitrary read via heap reuse.\nI:H - The copy is a use-after-free / wild write of attacker-chosen contents and length into reused kernel or page-cache memory, which is exploitable for arbitrary write and control-flow hijacking.\nA:H - The same stale-iterator write was reproduced as a KASAN wild-memory-access in _copy_to_iter from nvme_tcp_io_work and can oops or panic the host kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/host/tcp.c" ], "versions": [ { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "32ea8ce96b9bd797c59c351ce490ffd97adaa8c0", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "7ed0b61bbc145988be292c4d3ec580aebd8d2bcd", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "b36161701cb366f416afdcf70771d432a7c74753", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "6a01b58263108eaf9869bb6f82f07709240c6589", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "641ad3a30ba560f0a9a610376c568d7b75d2a2aa", "status": "affected", "versionType": "git" }, { "version": "25e5cb780e62bde432b401f312bb847edc78b432", "lessThan": "3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36", "status": "affected", "versionType": "git" }, { "version": "f507ae6e33cbe56c4e3fe000434fc0ecc263d098", "status": "affected", "versionType": "git" }, { "version": "b1458c16f4e26e87492e58e4d24a1873bd09232a", "status": "affected", "versionType": "git" }, { "version": "5.4.36", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.6.8", "lessThan": "5.7", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/host/tcp.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/32ea8ce96b9bd797c59c351ce490ffd97adaa8c0" }, { "url": "https://git.kernel.org/stable/c/dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab" }, { "url": "https://git.kernel.org/stable/c/7ed0b61bbc145988be292c4d3ec580aebd8d2bcd" }, { "url": "https://git.kernel.org/stable/c/b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528" }, { "url": "https://git.kernel.org/stable/c/b36161701cb366f416afdcf70771d432a7c74753" }, { "url": "https://git.kernel.org/stable/c/6a01b58263108eaf9869bb6f82f07709240c6589" }, { "url": "https://git.kernel.org/stable/c/641ad3a30ba560f0a9a610376c568d7b75d2a2aa" }, { "url": "https://git.kernel.org/stable/c/3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36" } ], "title": "nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-89482", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:22:37.965026Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:39.839Z" } } ] } }