CVE-2022-48821
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-48821
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48821.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-48821
- Related
- Published
- 2024-07-16T12:15:06Z
- Modified
- 2024-09-18T03:22:37.506326Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: avoid double fput() on failed usercopy
If the copy back to userland fails for the FASTRPCIOCTLALLOCDMABUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dmabuffd() called fd_install() before, i.e. "consumed" one reference, leaving us with none.
Calling dmabufput() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free.
Simply avoid calling dmabufput() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.
- References
-
- https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34
- https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215
- https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc
- https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5
- https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d
- https://security-tracker.debian.org/tracker/CVE-2022-48821
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.10.103-1
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source