{"id":"CVE-2026-90011","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Reserve a terminator byte for the login payload\n\niscsi_target_check_login_request() rejects a login PDU whose\nDataSegmentLength exceeds MAX_KEY_VAL…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Reserve a terminator byte for the login payload\n\niscsi_target_check_login_request() rejects a login PDU whose\nDataSegmentLength exceeds MAX_KEY_VAL…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 5fac79f248c37774d1dd761406f83d25ca6ff8e4","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 6ddddcad436d8e6e619204d3c848147ff2f5bf1e","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < b19dc17ed963ac36c0db4b52a1803fb11169f91f","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 6b589ef9d5f6cdc70d2b4f269ca6cf26b5ebb076","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < eb9dadf4d552ebe10644871c5189286552aa48f5","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 1624bff4c5118ad494d50ad94d44f22064667a7f","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < 3ddf3ea291a0ef2ea93b82e158960ac2cc42302b","Linux >= e48354ce078c079996f89d715dfa44814b4eba01 < f4825922d2fb371e2b969697d792077f1b62b62c","Linux 3.1"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:24.763","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90011","references":[{"url":"https://git.kernel.org/stable/c/1624bff4c5118ad494d50ad94d44f22064667a7f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3ddf3ea291a0ef2ea93b82e158960ac2cc42302b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5fac79f248c37774d1dd761406f83d25ca6ff8e4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6b589ef9d5f6cdc70d2b4f269ca6cf26b5ebb076","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6ddddcad436d8e6e619204d3c848147ff2f5bf1e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b19dc17ed963ac36c0db4b52a1803fb11169f91f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb9dadf4d552ebe10644871c5189286552aa48f5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f4825922d2fb371e2b969697d792077f1b62b62c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.942Z","epss":0.00829,"epssPercentile":0.56019,"slug":"CVE-2026-90011","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Reserve a terminator byte for the login payload\n\niscsi_target_check_login_request() rejects a login PDU whose\nDataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is '>' and\nlogin->req_buf is allocated with exactly MAX_KEY_VALUE_PAIRS\nbytes. Since iscsit_get_login_rx() receives payload_length + padding\nbytes, where\n\n\tpadding = ((-payload_length) & 3);\n\nany payload_length from 8189 to 8192 fills the whole 8192 byte\nbuffer. The write stays in bounds, but no byte is left for a NUL\nterminator.\n\nThe buffer is subsequently consumed as a C string. In the CHAP path\nchap_check_algorithm() calls kstrdup(a_str), and extract_param() calls\nstrstr(in_buf, pattern) followed by strlen_semi(), none of which take a\nlength. convert_null_to_semi() additionally rewrites every embedded NUL\nto ';', so even a payload made of well formed NUL separated key=value\nrecords is left without a terminator. These walk past the end of the\nobject into adjacent slab memory. It is reachable by an unauthenticated\ninitiator against a portal configured for CHAP; when authentication is\nnot required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and\nthe CHAP path is never entered.\n\nAllocate one extra byte. kzalloc() zeroes it and nothing ever writes to\nit, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS\nbytes, so the buffer is always terminated.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[{"seq":205033,"id":"CVE-2026-90011","ts":1789570704870,"field":"cvss","old":null,"new":"9.1"},{"seq":205032,"id":"CVE-2026-90011","ts":1789570704870,"field":"severity","old":"none","new":"critical"}]}