9.8 CVE-2026-53176
Enriched by CISA Patch
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.
https://nvd.nist.gov/vuln/detail/CVE-2026-53176
Categories
CWE-191 : Integer Underflow (Wrap or Wraparound)
This can happen in signed and unsigned cases.
CWE-839 : Numeric Range Comparison Without Minimum Check
The product checks a value to ensure that it is less than or equal to a maximum, but it does not also verify that the value is greater than or equal to the minimum. The "signed comparison" term is often used to describe when the product uses a signed variable and checks it to ensure that it is less than a maximum value (typically a maximum buffer size), but does not verify that it is greater than 0. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) If the number to be used is always expected to be positive, change the variable type from signed to unsigned or size_t. If the number to be used could have a negative value based on the specification (thus requiring a signed value), but the number should only be positive to preserve code correctness, then include a check to ensure that the value is positive. Chain: integer overflow (CWE-190) causes a negative signed value, which later bypasses a maximum-only check (CWE-839), leading to heap-based buffer overflow (CWE-122). Chain: 16-bit counter can be interpreted as a negative value, compared to a 32-bit maximum value, leading to buffer under-write. Chain: kernel's lack of a check for a negative value leads to memory corruption. Chain: parser uses atoi() but does not check for a negative value, which can happen on some platforms, leading to buffer under-write. Chain: Negative value stored in an int bypasses a size check and causes allocation of large amounts of memory. Chain: negative offset value to IOCTL bypasses check for maximum index, then used as an array index for buffer under-read. chain: file transfer client performs signed comparison, leading to integer overflow and heap-based buffer overflow. chain: negative ID in media player bypasses check for maximum index, then used as an array index for buffer under-read.
References
0b0ca135-0b70-47e7-9f44-1890c2a1c46c
| https://access.redhat.com/security/cve/CVE-2026-53176 Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2492741 Issue Tracking Third Party Advisory |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json Third Party Advisory |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
AFFECTED (from MITRE)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux |
|
| Linux | Linux |
|
| © 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. | ||
CPE
| cpe | start | end |
|---|---|---|
| Configuration 1 | ||
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 3.10 | < 5.10.259 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 5.11 | < 5.15.210 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 5.16 | < 6.1.176 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 6.2 | < 6.6.143 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 6.7 | < 6.12.94 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 6.13 | < 6.18.36 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | >= 6.19 | < 7.0.13 |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* | ||
REMEDIATION
Patch
EXPLOITS
Exploit-db.com
| id | description | date | |
|---|---|---|---|
| No known exploits | |||
POC Github
| Url |
|---|
| No known exploits |
Other Nist (github, ...)
| Url |
|---|
| No known exploits |
CAPEC
Common Attack Pattern Enumerations and Classifications
| id | description | severity |
|---|---|---|
| No entry | ||
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