scsi: target: iscsi: Reserve a terminator byte for the login payload
In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Reserve a terminator byte for the login payload iscsi_target_check_login_request() rejects a login PDU whose DataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is '>' and login->req_buf is allocated with exactly MAX_KEY_VALUE_PAIRS bytes. Since iscsit_get_login_rx() receives payload_length + padding bytes, where padding = ((-payload_length) & 3); any payload_length from 8189 to 8192 fills the whole 8192 byte buffer. The write stays in bounds, but no byte is left for a NUL terminator. The buffer is subsequently consumed as a C string. In the CHAP path chap_check_algorithm() calls kstrdup(a_str), and extract_param() calls strstr(in_buf, pattern) followed by strlen_semi(), none of which take a length. convert_null_to_semi() additionally rewrites every embedded NUL to ';', so even a payload made of well formed NUL separated key=value records is left without a terminator. These walk past the end of the object into adjacent slab memory. It is reachable by an unauthenticated initiator against a portal configured for CHAP; when authentication is not required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and the CHAP path is never entered. Allocate one extra byte. kzalloc() zeroes it and nothing ever writes to it, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS bytes, so the buffer is always terminated.
CVE-2026-90011
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-2026-90011
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": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "5fac79f248c37774d1dd761406f83d25ca6ff8e4",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "6ddddcad436d8e6e619204d3c848147ff2f5bf1e",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "b19dc17ed963ac36c0db4b52a1803fb11169f91f",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "6b589ef9d5f6cdc70d2b4f269ca6cf26b5ebb076",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "eb9dadf4d552ebe10644871c5189286552aa48f5",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "1624bff4c5118ad494d50ad94d44f22064667a7f",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "3ddf3ea291a0ef2ea93b82e158960ac2cc42302b",
"versionType": "git"
},
{
"status": "affected",
"version": "e48354ce078c079996f89d715dfa44814b4eba01",
"lessThan": "f4825922d2fb371e2b969697d792077f1b62b62c",
"versionType": "git"
}
],
"programFiles": [
"drivers/target/iscsi/iscsi_target_login.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.1",
"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": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/target/iscsi/iscsi_target_login.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90011
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #36444 · Revision 1
- Added to Heist Feed
- Publisher date