CVE-2021-47649
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages().
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882Patch
- https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9Patch
- https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137ePatch
- https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9Patch
- https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202Patch
- https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.