IB/isert: reject PDUs declaring more data than was received
In the Linux kernel, the following vulnerability has been resolved: IB/isert: reject PDUs declaring more data than was received isert_recv_done() hands each received PDU to the opcode handlers without ever looking at wc->byte_len, the number of bytes the HCA actually placed in the receive descriptor. The handlers then copy that many bytes - the data-segment length the initiator declared in the BHS (ntoh24(hdr->dlength), via the derived unsol_data_len / imm_data_len) - out of the fixed-size descriptor: isert_handle_iscsi_dataout(): sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc), unsol_data_len); isert_handle_scsi_cmd(): sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents, isert_get_data(rx_desc), imm_data_len); Because the declared length is never checked against wc->byte_len, an initiator can declare a data segment larger than the bytes it actually sent (and larger than the descriptor) and cause an out-of-bounds read of the receive buffer. Nothing upstream of isert closes this door: - __iscsit_check_dataout_hdr() bounds the inbound payload against conn_ops->MaxXmitDataSegmentLength (MXDSL) - a transmit parameter, used here for the inbound check. - iscsi_set_connection_parameters() sets ops->MaxXmitDataSegmentLength = ops->TargetRecvDataSegmentLength; and TARGETRECVDATASEGMENTLENGTH is absent from the min()-clamp list in iscsi_check_acceptor_state(), so the value the initiator declares is adopted verbatim (type range 512..16777215). The initiator effectively r
CVE-2026-90414
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90414
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "b4706722ed3ea72882b3c986a19b4a1ba66384c4",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "bc58e9d3dc560220c57b8bdfc12af0cff1c8a43d",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "274b1ad7e78338710864c4b4235bb1ce7e7107f9",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "2a6b8f88fb7ee51714a1922a039225bdcaf12855",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "39da0b7e1f530347d284cebcfc5b5afa90a173bf",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "cf36fa5357a2fb25776a568d13a3653da7d99bcb",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "352dc85324b29f5c85876f2666f3158b645e3f18",
"versionType": "git"
},
{
"status": "affected",
"version": "b8d26b3be8b33682cf163274ed07479a70554633",
"lessThan": "957f92ea4022fb6af4618271615a2a21a7b5bef9",
"versionType": "git"
}
],
"programFiles": [
"drivers/infiniband/ulp/isert/ib_isert.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/infiniband/ulp/isert/ib_isert.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90414
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #36734 · Revision 1
- Added to Heist Feed
- Publisher date