CVE-2021-47384

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]

CVSS Metrics

• v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Trends

Current EPSS score: 0.03%• Percentile: 11%

Techniques & Countermeasures

• CWE-476•NULL Pointer Dereference

  The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

• linux•linux

  ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 6cb01fe630eaffc5a2c3f7364436caddba286623 | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 7c4fd5de39f273626a2b0f3a446d2cc85cd47616 | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 746011193f44f97f8784edcf8327c587946745fc | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < dd4d747ef05addab887dc8ff0d6ab9860bbcd783 | 5.4

• linux•linux_kernel

  < 5.4.151 | ≥ 5.5, < 5.10.71 | ≥ 5.11, < 5.14.10 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3

References (4)

• https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623
• https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616
• https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc
• https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783