{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-90413", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-90413", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-17T16:09:39.383Z", "updatedAt": "2026-10-19T09:03:17.470Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "IB/isert: reject login PDUs declaring more data than was received", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: reject login PDUs declaring more data than was received\n\nisert_login_recv_done() records how many bytes the HCA actually placed in\nthe login buffer, but nothing compares that against the length the login\nPDU's BHS declares. isert_rx_login_req() copies min(login_req_len,\nMAX_KEY_VALUE_PAIRS) bytes into login->req_buf, and the login code then\nreads the declared length back out of that buffer - for the first PDU in\niscsi_target_locate_portal(),\n\n\tpayload_length = ntoh24(login_req->dlength);\n\ttmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL);\n\nand for the ones after it in iscsi_decode_text_input(), reached from\niscsi_target_do_login().\n\nlogin->req_buf is a fixed MAX_KEY_VALUE_PAIRS (8192) byte allocation, so\nan initiator that declares more than it sends reads off the end of it,\nbefore authentication and with the length under its control:\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_nul+0x43/0x80\n Read of size 8193 at addr ffff8881056a8000 by task iscsi_np/167\n __asan_memcpy+0x23/0x60\n kmemdup_nul+0x43/0x80\n iscsi_target_locate_portal+0x48d/0x1180\n iscsi_target_login_thread+0x19a9/0x3350\n Allocated by task 167:\n __kmalloc_cache_noprof+0x158/0x370\n iscsi_target_login_thread+0x971/0x3350\n which belongs to the cache kmalloc-8k of size 8192\n allocated 8192-byte region\n\nFalsifying the second login PDU instead reaches the other reader, on the\nsame buffer:\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_nul+0x43/0x80\n Read of size 8193 at addr ffff888104d10000 by task kworker/1:1/50\n Workqueue: isert_login_wq iscsi_target_do_login_rx\n __asan_memcpy+0x23/0x60\n kmemdup_nul+0x43/0x80\n iscsi_decode_text_input+0xc6/0x11c0\n iscsi_target_do_login+0x261/0x1470\n iscsi_target_do_login_rx+0x51d/0x7d0\n\niscsit over TCP is not exposed: iscsit_get_login_rx() validates the\ndeclared length with iscsi_target_check_login_request() and then reads\nexactly that many bytes off the socket, so the declared length governs\nhow much arrives rather than how much is copied out of an already-filled\nbuffer. isert does not call iscsi_target_check_login_request() at all.\n\nReject a login PDU whose declared DataSegmentLength exceeds what was\nreceived, in both paths that reach isert_rx_login_req():\nisert_get_login_rx() for the first login PDU and isert_login_recv_done()\nfor the ones after it. dlength <= login_req_len is allowed because the\nreceived count can include up to three bytes of iSCSI padding.\n\nOnce the check is in place the copy out can no longer exceed the copy in:\nthe posted login SGE is ISER_RX_PAYLOAD_SIZE, so login_req_len cannot\nexceed MAX_KEY_VALUE_PAIRS and the min() in isert_rx_login_req() is\nlogin_req_len.\n\nLike the existing short-PDU check added by 29e7b925ae6d, the reject in\nisert_login_recv_done() returns without completing login_req_comp, so a\nmalformed subsequent PDU leaves the login to be torn down by the login\ntimer rather than failing immediately. The first-PDU path returns an\nerror and fails straight away.\n\nReproduced on 7.2.0-rc4 with soft-RoCE (rdma_rxe) under KASAN, using an\ninitiator that sends the real key=value payload while declaring 8193 in\nthe BHS, on the first login PDU and on the second in separate runs. The\nreported read size tracks the declared value exactly; 16384 and 61440\nbehave the same. Unpatched 3 of 3 runs report on each of the two paths,\npatched 0 of 3 on both, run alternately in a single session, and a normal\nlogin still completes on the patched build.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "b1f3313e7b3e396e4985fea5c709477387e0a065" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "228aaa620fe6a7bc8b5b21dd348b4836b1760c61" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "0d9c0586af703890afe1bd0cfe641e3a3af1c32d" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "44fe800ec13386c88bd5b32bcd1deaa1e17535d5" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "71ec8bbfa4a183f1e623662f9cfbcd702e433bdb" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "c345d9d0b3eefc990bb90cf565325785aab06aab" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "48812c8103071d550d9ab4a3431be5bdc52255bc" }, { "version": "b8d26b3be8b33682cf163274ed07479a70554633", "status": "affected", "versionType": "git", "lessThan": "2488b5b4827e5415768afc8daf097e8eb83c98df" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.10" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.110", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.52", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }