CVE-2026-89864
UnknownSummary
In the Linux kernel, the scsi qla2xxx driver's I2C bsg handlers use the i2c->length field (16-bit) without bounds checking, while the buffer is a fixed 64 bytes. This can lead to stack and heap overflows and memory leaks when the length exceeds the buffer size.
Risk Assessment
Allows a local user with CAP_SYS_RAWIO privileges to corrupt kernel heap and stack, potentially leading to arbitrary code execution or system crash. Represents a serious security threat.
Recommendation
Update the Linux kernel to a version containing the fix that rejects requests whose length exceeds the buffer before any copy or DMA transfer. Restrict CAP_SYS_RAWIO privileges.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS