CVE-2019-15792
As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.10%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() calls fdget(oldfd), then without further checks passes the resulting file* into shiftfs_real_fdget(), which casts file->private_data, a void* that points to a filesystem-dependent type, to a "struct shiftfs_file_info *". As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.
- 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
- 1.10% probability · 64th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-843
- Affected
- linux/linux kernel · canonical/ubuntu linux
- Source
- security@ubuntu.com
References
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=5df147c8140efc71ac0879ae3b0057f577226d4cMailing List, Patch, Third Party Advisory
- https://usn.ubuntu.com/usn/usn-4183-1Vendor Advisory
- https://usn.ubuntu.com/usn/usn-4184-1Vendor Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=5df147c8140efc71ac0879ae3b0057f577226d4cMailing List, Patch, Third Party Advisory
- https://usn.ubuntu.com/usn/usn-4183-1Vendor Advisory
- https://usn.ubuntu.com/usn/usn-4184-1Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.