SB2023072615 - Ubuntu update for linux

Description

This security bulletin contains information about 8 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-2640)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to missing permission checks for trusted.overlayfs.* xattrs". A local user can set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

2) Out-of-bounds write (CVE-ID: CVE-2023-3090)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the ipvlan network driver in Linux kernel. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.

3) Use-after-free (CVE-ID: CVE-2023-31248)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in nft_chain_lookup_byid() function, which failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace. A local user ca trigger a use-after-free error and execute arbitrary code with elevated privileges.

4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-32629)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to ovl_copy_up_meta_inode_data skips permission checks when calling ovl_do_setxattr on Ubuntu kernels. A local user can execute arbitrary code with elevated privileges.

5) Use-after-free (CVE-ID: CVE-2023-3269)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the handling of stack expansion within the memory management subsystem in the Linux kernel. A local user can trigger a use-after-free error and execute arbitrary code on the system with elevated privileges.

6) Use-after-free (CVE-ID: CVE-2023-3389)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the Linux Kernel io_uring subsystem. A local user can exploit a race condition and execute arbitrary code with elevated privileges.

7) Use-after-free (CVE-ID: CVE-2023-3390)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within net/netfilter/nf_tables_api.c in the Linux kernel netfilter subsystem. A local user can trigger a use-after-fee error and escalate privileges on the system.

8) Out-of-bounds write (CVE-ID: CVE-2023-35001)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the nft_byteorder() function. A local user can trigger an out-of-bounds write and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-6250-1