{"api_version":"1","generated_at":"2026-06-27T02:40:26+00:00","cve":"CVE-2026-53176","urls":{"html":"https://cve.report/CVE-2026-53176","api":"https://cve.report/api/cve/CVE-2026-53176.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53176","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53176"},"summary":{"title":"IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\n\nIn drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done()\ncomputes the login request payload length as wc->byte_len minus\nISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int.\nA remote iSER initiator can post a login Send work request carrying\nfewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows\nand login_req_len becomes negative.\n\nisert_rx_login_req() then reads that negative length back into a signed\nint, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the\nmin() is signed it keeps the negative value; the value is then passed as\nthe memcpy() length and sign-extended to a multi-gigabyte size_t. The\ncopy into the 8192-byte login->req_buf runs far out of bounds and\nfaults, crashing the target node. The login phase precedes iSCSI\nauthentication, so no credentials are required to reach this path.\n\nReject any login PDU shorter than ISER_HEADERS_LEN before the\nsubtraction, mirroring the existing early return on a failed work\ncompletion, so login_req_len can never go negative. The upper bound was\nalready safe: a posted login buffer cannot deliver more than\nISER_RX_PAYLOAD_SIZE, so the difference stays at or below\nMAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing\nlower bound needs to be added.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:34","updated_at":"2026-06-25 09:16:34"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a","name":"https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb","name":"https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548","name":"https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e","name":"https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47","name":"https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d","name":"https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a","name":"https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260","name":"https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53176","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53176","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b8d26b3be8b33682cf163274ed07479a70554633 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b8d26b3be8b33682cf163274ed07479a70554633 e8a013c0c3ca2f6708341a56612a3f6d6921620a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b8d26b3be8b33682cf163274ed07479a70554633 bd22740d7f14cb1c0289444cfd2c8d2938667c1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b8d26b3be8b33682cf163274ed07479a70554633 c1234229399f4af12c553b1b0ffd978eeba65548 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53176","cve":"CVE-2026-53176","epss":"0.002120000","percentile":"0.114350000","score_date":"2026-06-26","updated_at":"2026-06-27 00:07:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/infiniband/ulp/isert/ib_isert.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"e8a013c0c3ca2f6708341a56612a3f6d6921620a","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"bd22740d7f14cb1c0289444cfd2c8d2938667c1d","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"c1234229399f4af12c553b1b0ffd978eeba65548","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"df422fd273c96c2ee5beb80fc21adc8c70c29260","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"1ca40b243277c9e88be5e00bd3e083f71aefb93e","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"},{"lessThan":"29e7b925ae6df64894e82ab6419994dc25580a8a","status":"affected","version":"b8d26b3be8b33682cf163274ed07479a70554633","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/infiniband/ulp/isert/ib_isert.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.10"},{"lessThan":"3.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"3.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\n\nIn drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done()\ncomputes the login request payload length as wc->byte_len minus\nISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int.\nA remote iSER initiator can post a login Send work request carrying\nfewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows\nand login_req_len becomes negative.\n\nisert_rx_login_req() then reads that negative length back into a signed\nint, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the\nmin() is signed it keeps the negative value; the value is then passed as\nthe memcpy() length and sign-extended to a multi-gigabyte size_t. The\ncopy into the 8192-byte login->req_buf runs far out of bounds and\nfaults, crashing the target node. The login phase precedes iSCSI\nauthentication, so no credentials are required to reach this path.\n\nReject any login PDU shorter than ISER_HEADERS_LEN before the\nsubtraction, mirroring the existing early return on a failed work\ncompletion, so login_req_len can never go negative. The upper bound was\nalready safe: a posted login buffer cannot deliver more than\nISER_RX_PAYLOAD_SIZE, so the difference stays at or below\nMAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing\nlower bound needs to be added."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:38:52.693Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb"},{"url":"https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a"},{"url":"https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d"},{"url":"https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548"},{"url":"https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47"},{"url":"https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260"},{"url":"https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e"},{"url":"https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a"}],"title":"IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53176","datePublished":"2026-06-25T08:38:52.693Z","dateReserved":"2026-06-09T07:44:35.389Z","dateUpdated":"2026-06-25T08:38:52.693Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:34","lastModifiedDate":"2026-06-25 09:16:34","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53176","Ordinal":"1","Title":"IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN","CVE":"CVE-2026-53176","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53176","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\n\nIn drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done()\ncomputes the login request payload length as wc->byte_len minus\nISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int.\nA remote iSER initiator can post a login Send work request carrying\nfewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows\nand login_req_len becomes negative.\n\nisert_rx_login_req() then reads that negative length back into a signed\nint, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the\nmin() is signed it keeps the negative value; the value is then passed as\nthe memcpy() length and sign-extended to a multi-gigabyte size_t. The\ncopy into the 8192-byte login->req_buf runs far out of bounds and\nfaults, crashing the target node. The login phase precedes iSCSI\nauthentication, so no credentials are required to reach this path.\n\nReject any login PDU shorter than ISER_HEADERS_LEN before the\nsubtraction, mirroring the existing early return on a failed work\ncompletion, so login_req_len can never go negative. The upper bound was\nalready safe: a posted login buffer cannot deliver more than\nISER_RX_PAYLOAD_SIZE, so the difference stays at or below\nMAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing\nlower bound needs to be added.","Type":"Description","Title":"IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN"}]}}}