{"id":"CVE-2026-89864","published":"2026-09-16T11:16:54.480","lastModified":"2026-09-16T11:16:54.480","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Bound i2c->length in I2C bsg handlers\n\nstruct qla_i2c_access carries a 16-bit length field alongside a fixed\n64-byte buffer:\n\n\tstruct qla_i2c_access {\n\t\tuint16_t device, offset, option, length;\n\t\tuint8_t  buffer[0x40];\n\t} __packed;\n\nqla2x00_write_i2c() and qla2x00_read_i2c() use the user-supplied\ni2c->length without any bounds check. i2c is overlaid on a 256-byte\non-stack buffer and sfp is a 256-byte DMA-pool buffer, so a length up to\n65535 overruns both:\n\n  - write: memcpy(sfp, i2c->buffer, i2c->length) over-reads the stack and\n    over-writes the sfp heap buffer, and qla2x00_write_sfp() then DMAs\n    i2c->length bytes out of the 256-byte buffer.\n  - read: qla2x00_read_sfp() DMAs i2c->length bytes into the 256-byte sfp,\n    then memcpy(i2c->buffer, sfp, i2c->length) overflows the 64-byte\n    buffer inside the on-stack array.\n\nA caller holding CAP_SYS_RAWIO can use this to corrupt the heap and the\nkernel stack. Reject requests whose length exceeds the buffer before any\ncopy or DMA transfer in both handlers.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0918ee2c0eeb4d7f45b82b3dc11e65c2d9b7ad59","tags":[]},{"url":"https://git.kernel.org/stable/c/2be39946abcde5a6416fb074ef728429e246a996","tags":[]},{"url":"https://git.kernel.org/stable/c/32d6df14fdab71fe1ba304fd9a0db0411ea2e043","tags":[]},{"url":"https://git.kernel.org/stable/c/47049fdadc0eaa115e813735b827e1379c0d2cf8","tags":[]},{"url":"https://git.kernel.org/stable/c/522d6dcdc645d8f97d6b4cdfd6d8eea307f3ff0e","tags":[]},{"url":"https://git.kernel.org/stable/c/8f01f886cc5e7bbc16cbf1a9928fdebbc911e973","tags":[]},{"url":"https://git.kernel.org/stable/c/97ca58b0fb026799b99e3d552d5f69cf9a3113ad","tags":[]},{"url":"https://git.kernel.org/stable/c/9a756f277eb89f769dbf380f38245c270d31fdb5","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}