SB2024110794 - Ubuntu live patch for Linux kernel

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Integer underflow (CVE-ID: CVE-2024-26921)

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to integer underflow within the nf_ct_frag6_queue() and nf_ct_frag6_gather() functions in net/ipv6/netfilter/nf_conntrack_reasm.c, within the ip_frag_queue() and ip_defrag() functions in net/ipv4/ip_fragment.c, within the FRAG_CB(), inet_frag_queue_insert(), inet_frag_reasm_prepare(), EXPORT_SYMBOL() and inet_frag_reasm_finish() functions in net/ipv4/inet_fragment.c. A local user can execute arbitrary code.

2) Improper locking (CVE-ID: CVE-2024-26923)

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

The vulnerability exists due to improper locking within the unix_gc() function in net/unix/garbage.c due to garbage collector does not take into account the risk of embryo getting enqueued during the garbage collection. A local user can execute arbitrary code with elevated privileges.

3) Race condition (CVE-ID: CVE-2024-26960)

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

The vulnerability exists due to a race condition within the __swap_entry_free_locked() and free_swap_and_cache() functions in mm/swapfile.c. A local user can escalate privileges on the system.

4) Use-after-free (CVE-ID: CVE-2024-27398)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the sco_sock_timeout() function in net/bluetooth/sco.c. A remote attacker can trigger a use-after-free error and perform a denial of service (DoS) attack.

5) Use-after-free (CVE-ID: CVE-2024-38630)

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

The vulnerability exists due to a use-after-free error within the cpu5wdt_exit() function in drivers/watchdog/cpu5wdt.c. A local user can escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/LSN-0107-1