CVE-2021-47241
In the Linux kernel, the following vulnerability has been resolved: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.02%). 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: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for. This may result in ETHTOOL_MSG_STRSET_GET producing a warning like: calculated message payload length (684) not sufficient WARNING: CPU: 0 PID: 30967 at net/ethtool/netlink.c:369 ethnl_default_doit+0x87a/0xa20 and a splat. As usually with such warnings three conditions must be met for the warning to trigger: - there must be no skb size rounding up (e.g. reply_size of 684); - string set must be per-device (so that the header gets populated); - the device name must be at least 12 characters long. all in all with current user space it looks like reading priv flags is the only place this could potentially happen. Or with syzbot :)
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.02% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-266
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/cfc7f0e70d649e6d2233fba0d9390b525677d971Patch
- https://git.kernel.org/stable/c/e175aef902697826d344ce3a12189329848fe898Patch
- https://git.kernel.org/stable/c/fb3a948143688e14e2cfd2a2812877923d0e5e92Patch
- https://git.kernel.org/stable/c/cfc7f0e70d649e6d2233fba0d9390b525677d971Patch
- https://git.kernel.org/stable/c/e175aef902697826d344ce3a12189329848fe898Patch
- https://git.kernel.org/stable/c/fb3a948143688e14e2cfd2a2812877923d0e5e92Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.