Type confusion in shiftfs
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.1epss 1.1%
from disclosure to weapon0 days
Published on NVDApr 23
1st PoCNov 20
exploitation probability
1.1%top 37% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Affected products
Ubuntu · Shiftfs in the Linux kernelpublic PoCs found — 1✓ VexDay Proof
exploitdb✓ VexDay Proofwww.exploit-db.com/exploits/47693⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.