CVE-2026-53176: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
Vendor fix available · Affected: Linux · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 55% of scored CVEs
DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN In drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done() computes the login request payload length as wc->byte_len minus ISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int. A remote iSER initiator can post a login Send work request carrying fewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows and login_req_len becomes negative. isert_rx_login_req() then reads that negative length back into a signed int, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the min() is signed it keeps the negative value; the value is then passed as the memcpy() length and sign-extended to a multi-gigabyte size_t. The copy into the 8192-byte login->req_buf runs far out of bounds and faults, crashing the target node. The login phase precedes iSCSI authentication, so no credentials are required to reach this path. Reject any login PDU shorter than ISER_HEADERS_LEN before the subtraction, mirroring the existing early return on a failed work completion, so login_req_len can never go negative. The upper bound was already safe: a posted login buffer cannot deliver more than ISER_RX_PAYLOAD_SIZE, so the difference stays at or below MAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing lower bound needs to be added.
Affected products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Linux · LinuxVersions not stated
- Linux · Linux3.10
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-53176 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-839cwe.mitre.org
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefbgit.kernel.org
- git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620agit.kernel.org
- git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1dgit.kernel.org
- git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548git.kernel.org
- git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47git.kernel.org
- git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260git.kernel.org
- git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93egit.kernel.org
- git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8agit.kernel.org
3 more references are in the CVE record.