Ubuntu: (CVE-2022-48821): linux vulnerability

Ubuntu: (CVE-2022-48821): linux vulnerability

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

07/16/2024

Created

11/21/2024

Added

11/19/2024

Modified

02/11/2025

Description

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 FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() 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 dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.

Solution(s)

• ubuntu-upgrade-linux
• ubuntu-upgrade-linux-aws
• ubuntu-upgrade-linux-aws-5-4
• ubuntu-upgrade-linux-aws-fips
• ubuntu-upgrade-linux-azure
• ubuntu-upgrade-linux-azure-5-4
• ubuntu-upgrade-linux-azure-fips
• ubuntu-upgrade-linux-bluefield
• ubuntu-upgrade-linux-fips
• ubuntu-upgrade-linux-gcp
• ubuntu-upgrade-linux-gcp-5-4
• ubuntu-upgrade-linux-gcp-fips
• ubuntu-upgrade-linux-gkeop
• ubuntu-upgrade-linux-hwe-5-4
• ubuntu-upgrade-linux-ibm
• ubuntu-upgrade-linux-ibm-5-4
• ubuntu-upgrade-linux-intel-iotg-5-15
• ubuntu-upgrade-linux-iot
• ubuntu-upgrade-linux-kvm
• ubuntu-upgrade-linux-oracle
• ubuntu-upgrade-linux-oracle-5-4
• ubuntu-upgrade-linux-raspi
• ubuntu-upgrade-linux-raspi-5-4

References

• https://attackerkb.com/topics/cve-2022-48821
• CVE - 2022-48821
• https://git.kernel.org/linus/46963e2e0629cb31c96b1d47ddd89dc3d8990b34
• 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://www.cve.org/CVERecord?id=CVE-2022-48821

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