CVE-2026-74557scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer iscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the target-supplied data segment. The segment carries a 2-byte sense length followed by the sense bytes, so it must hold 2 + senselen bytes, but the bounds check only requires datalen >= senselen: senselen = get_unaligned_be16(data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); A target that returns a SCSI Response whose datalen equals senselen (with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data + 2 read up to two bytes past the received data. Those bytes are stale conn->data contents and end up in the command's sense buffer, which is returned to userspace. Account for the 2-byte sense length prefix in the check.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 builds before 812f1ae95b22419422972748f173b0916ee4d621; from 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 before fef6167e8149896cd81bea333fd51b1c91239149; from 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 before baa04572673125e4d5bc309b4077d1cb46cc78d1; 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 builds before 7567f06abdefb1caf2d836107c4d08c5185c650e; from 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 before 60499924faf4ef97e84228c20515218ef121facf; 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 builds before 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac; 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 builds before 1f07a897d43c63e6c9458bf77450defef39b5833; 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 builds before 98b87885de4b7f605533a2860685f5689fce8e82 | CNA record |
References
- https://git.kernel.org/stable/c/812f1ae95b22419422972748f173b0916ee4d621
- https://git.kernel.org/stable/c/fef6167e8149896cd81bea333fd51b1c91239149
- https://git.kernel.org/stable/c/baa04572673125e4d5bc309b4077d1cb46cc78d1
- https://git.kernel.org/stable/c/7567f06abdefb1caf2d836107c4d08c5185c650e
- https://git.kernel.org/stable/c/60499924faf4ef97e84228c20515218ef121facf
- https://git.kernel.org/stable/c/3ef209ca0b4b68c75e9a814d90cc916026b5a6ac
- https://git.kernel.org/stable/c/1f07a897d43c63e6c9458bf77450defef39b5833
- https://git.kernel.org/stable/c/98b87885de4b7f605533a2860685f5689fce8e82
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.