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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-53176

IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • b8d26b3be8b33682cf163274ed07479a70554633 to < 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefbaffected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < e8a013c0c3ca2f6708341a56612a3f6d6921620aaffected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < bd22740d7f14cb1c0289444cfd2c8d2938667c1daffected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < c1234229399f4af12c553b1b0ffd978eeba65548affected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47affected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < df422fd273c96c2ee5beb80fc21adc8c70c29260affected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < 1ca40b243277c9e88be5e00bd3e083f71aefb93eaffected
  • b8d26b3be8b33682cf163274ed07479a70554633 to < 29e7b925ae6df64894e82ab6419994dc25580a8aaffected

Linux Linux

Default version status: affected

  • 3.10affected
  • 0 to < 3.10unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 5.15.210 to ≤ 5.15.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.94 to ≤ 6.12.*unaffected
  • 6.18.36 to ≤ 6.18.*unaffected
  • 7.0.13 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References