CVE-2021-47040
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check_<op>_overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-120
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7Patch
- https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9Patch
- https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03Patch
- https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2dPatch
- https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7Patch
- https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9Patch
- https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03Patch
- https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.