{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97413", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T14:53:16.867Z", "datePublished": "2026-09-24T16:03:21.010Z", "dateUpdated": "2026-10-03T10:58:05.684Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:58:05.684Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs-srv: Fix integer underflow in process_read and process_write\n\nusr_len is read from a network-supplied message field (le16_to_cpu)\nand used to compute data_len = off - usr_len without validating that\nusr_len <= off. A malicious RDMA client can send usr_len > off causing\nan integer underflow, resulting in data_len wrapping to a huge size_t\nvalue which is then passed to the rdma_ev callback as a memory length,\nleading to out-of-bounds memory access.\n\nFix by reading and validating usr_len <= off before rtrs_srv_get_ops_ids()\nin both process_read() and process_write(), ensuring the early return\npath acquires no reference and has no resource leak." } ], "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 - A remote peer RDMA-WRITE-WITH-IMM's a RTRS_MSG_READ or RTRS_MSG_WRITE carrying attacker-controlled usr_len; rtrs_srv_rdma_done() hands that buffer to process_io_req() then process_read()/process_write(). rtrs_srv_cm_init() listens with RDMA_PS_TCP on IPv6 port 1234 (RoCEv2/iWARP), which is IP-routable.\nAC:L - The peer sets le16 usr_len in the RTRS_MSG_READ/WRITE at chunk+off and the IMM payload that rtrs_srv_rdma_done() splits into msg_id and off. Choosing usr_len > off makes size_t data_len = off - usr_len wrap on every call; there is no race and no victim-held state.\nPR:N - rtrs_rdma_connect() admits the RDMA_CM CONNECT_REQUEST after checking only RTRS_MAGIC, protocol major version, and cid/uuid; process_info_req() then publishes chunk rkeys and moves to RTRS_SRV_CONNECTED with no credentials, so process_read()/process_write() run unauthenticated.\nUI:N - The attacker posts the RDMA-WRITE-WITH-IMM that rtrs_srv_rdma_done() delivers to process_read()/process_write(); no local user must mount a volume, open a file, or otherwise interact.\nS:U - process_read()/process_write() invoke rnbd_srv_rdma_ev() in the same host kernel that owns the chunk pages; the OOB access stays inside that kernel and does not escape a VM, guest, or IOMMU domain.\nC:H - Underflowed data_len makes usr = page_address(chunk)+off-usr_len point before the chunk. rnbd_srv_rdma_ev() reads the RNBD header there; a sprayed RNBD_MSG_OPEN does unbounded strlen(dev_name), and process_rdma() bio_add_virt_nofail()s a ~4GiB WRITE bvec that copies following linear-map pages onto a device the peer can read back.\nI:H - process_rdma() truncates the wrapped size_t to u32 and bio_add_virt_nofail() installs a ~4GiB bvec from the chunk page; submit_bio() of an RNBD_OP_READ therefore writes device data through that bvec into subsequent kernel linear-map pages, an out-of-bounds kernel write.\nA:H - rnbd_srv_rdma_ev() immediately loads hdr->type from the wrapped usr pointer, process_msg_open() strlen()s that OOB name, and the ~4GiB bio_add_virt_nofail() bvec walks into holes or MMIO in the linear map; any of those oops/panic the completion path and can be repeated at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/ulp/rtrs/rtrs-srv.c" ], "versions": [ { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "6b1e26e70d7ca9f0906af2283558a530eeb1f066", "status": "affected", "versionType": "git" }, { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "2c52b2afded988233cd4ccc185cf5147bbc77a76", "status": "affected", "versionType": "git" }, { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "b042b4947752df0b3d16e683ac09fb4f7f0e33e0", "status": "affected", "versionType": "git" }, { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "24ad03bfeda05fca04c56677e57fd3d6bc3e9978", "status": "affected", "versionType": "git" }, { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "c76e9123ab91a903396d26e6ab1b5caae5c6b149", "status": "affected", "versionType": "git" }, { "version": "9cb837480424e78ed585376f944088246685aec3", "lessThan": "54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/ulp/rtrs/rtrs-srv.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.8", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6b1e26e70d7ca9f0906af2283558a530eeb1f066" }, { "url": "https://git.kernel.org/stable/c/2c52b2afded988233cd4ccc185cf5147bbc77a76" }, { "url": "https://git.kernel.org/stable/c/b042b4947752df0b3d16e683ac09fb4f7f0e33e0" }, { "url": "https://git.kernel.org/stable/c/24ad03bfeda05fca04c56677e57fd3d6bc3e9978" }, { "url": "https://git.kernel.org/stable/c/c76e9123ab91a903396d26e6ab1b5caae5c6b149" }, { "url": "https://git.kernel.org/stable/c/54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5" } ], "title": "RDMA/rtrs-srv: Fix integer underflow in process_read and process_write", "x_generator": { "engine": "bippy-1.2.0" } } } }