IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-53176
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:34 UTC
Updated2026-06-25 09:16:34 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002120000 probability, percentile 0.114350000 (date 2026-06-26)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 e8a013c0c3ca2f6708341a56612a3f6d6921620a git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 bd22740d7f14cb1c0289444cfd2c8d2938667c1d git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 c1234229399f4af12c553b1b0ffd978eeba65548 git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 df422fd273c96c2ee5beb80fc21adc8c70c29260 git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 1ca40b243277c9e88be5e00bd3e083f71aefb93e git Not specified
CNA Linux Linux affected b8d26b3be8b33682cf163274ed07479a70554633 29e7b925ae6df64894e82ab6419994dc25580a8a git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report