Description
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Bound i2c->length in I2C bsg handlers
struct qla_i2c_access carries a 16-bit length field alongside a fixed
64-byte buffer:
struct qla_i2c_access {
uint16_t device, offset, option, length;
uint8_t buffer[0x40];
} __packed;
qla2x00_write_i2c() and qla2x00_read_i2c() use the user-supplied
i2c->length without any bounds check. i2c is overlaid on a 256-byte
on-stack buffer and sfp is a 256-byte DMA-pool buffer, so a length up to
65535 overruns both:
- write: memcpy(sfp, i2c->buffer, i2c->length) over-reads the stack and
over-writes the sfp heap buffer, and qla2x00_write_sfp() then DMAs
i2c->length bytes out of the 256-byte buffer.
- read: qla2x00_read_sfp() DMAs i2c->length bytes into the 256-byte sfp,
then memcpy(i2c->buffer, sfp, i2c->length) overflows the 64-byte
buffer inside the on-stack array.
A caller holding CAP_SYS_RAWIO can use this to corrupt the heap and the
kernel stack. Reject requests whose length exceeds the buffer before any
copy or DMA transfer in both handlers.
scsi: qla2xxx: Bound i2c->length in I2C bsg handlers
struct qla_i2c_access carries a 16-bit length field alongside a fixed
64-byte buffer:
struct qla_i2c_access {
uint16_t device, offset, option, length;
uint8_t buffer[0x40];
} __packed;
qla2x00_write_i2c() and qla2x00_read_i2c() use the user-supplied
i2c->length without any bounds check. i2c is overlaid on a 256-byte
on-stack buffer and sfp is a 256-byte DMA-pool buffer, so a length up to
65535 overruns both:
- write: memcpy(sfp, i2c->buffer, i2c->length) over-reads the stack and
over-writes the sfp heap buffer, and qla2x00_write_sfp() then DMAs
i2c->length bytes out of the 256-byte buffer.
- read: qla2x00_read_sfp() DMAs i2c->length bytes into the 256-byte sfp,
then memcpy(i2c->buffer, sfp, i2c->length) overflows the 64-byte
buffer inside the on-stack array.
A caller holding CAP_SYS_RAWIO can use this to corrupt the heap and the
kernel stack. Reject requests whose length exceeds the buffer before any
copy or DMA transfer in both handlers.
Published:
2026-09-16
Score:
n/a
EPSS:
< 1% Very Low
KEV:
No
Impact:
n/a
Action:
n/a
Analysis
No analysis available yet.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
|
|||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
No data.
No data.
No data available yet.
Remediation
No remediation available yet.
Tracking
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Advisories
No advisories yet.
References
History
Wed, 16 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Bound i2c->length in I2C bsg handlers struct qla_i2c_access carries a 16-bit length field alongside a fixed 64-byte buffer: struct qla_i2c_access { uint16_t device, offset, option, length; uint8_t buffer[0x40]; } __packed; qla2x00_write_i2c() and qla2x00_read_i2c() use the user-supplied i2c->length without any bounds check. i2c is overlaid on a 256-byte on-stack buffer and sfp is a 256-byte DMA-pool buffer, so a length up to 65535 overruns both: - write: memcpy(sfp, i2c->buffer, i2c->length) over-reads the stack and over-writes the sfp heap buffer, and qla2x00_write_sfp() then DMAs i2c->length bytes out of the 256-byte buffer. - read: qla2x00_read_sfp() DMAs i2c->length bytes into the 256-byte sfp, then memcpy(i2c->buffer, sfp, i2c->length) overflows the 64-byte buffer inside the on-stack array. A caller holding CAP_SYS_RAWIO can use this to corrupt the heap and the kernel stack. Reject requests whose length exceeds the buffer before any copy or DMA transfer in both handlers. | |
| Title | scsi: qla2xxx: Bound i2c->length in I2C bsg handlers | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-16T10:31:35.068Z
Reserved: 2026-09-11T19:38:34.771Z
Link: CVE-2026-89864
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-16T11:16:54.480
Modified: 2026-09-16T11:16:54.480
Link: CVE-2026-89864
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.