Ubuntu: (Multiple Advisories) (CVE-2024-40910): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix refcount imbalance on inbound connections When releasing a socket in ax25_release(), we call netdev_put() to decrease the refcount on the associated ax.25 device. However, the execution path for accepting an incoming connection never calls netdev_hold(). This imbalance leads to refcount errors, and ultimately to kernel crashes. A typical call trace for the above situation will start with one of the following errors: refcount_t: decrement hit 0; leaking memory. refcount_t: underflow; use-after-free. And will then have a trace like: Call Trace: <TASK> ? show_regs+0x64/0x70 ? __warn+0x83/0x120 ? refcount_warn_saturate+0xb2/0x100 ? report_bug+0x158/0x190 ? prb_read_valid+0x20/0x30 ? handle_bug+0x3e/0x70 ? exc_invalid_op+0x1c/0x70 ? asm_exc_invalid_op+0x1f/0x30 ? refcount_warn_saturate+0xb2/0x100 ? refcount_warn_saturate+0xb2/0x100 ax25_release+0x2ad/0x360 __sock_release+0x35/0xa0 sock_close+0x19/0x20 [...] On reboot (or any attempt to remove the interface), the kernel gets stuck in an infinite loop: unregister_netdevice: waiting for ax0 to become free. Usage count = 0 This patch corrects these issues by ensuring that we call netdev_hold() and ax25_dev_hold() for new connections in ax25_accept(). This makes the logic leading to ax25_accept() match the logic for ax25_bind(): in both cases we increment the refcount, which is ultimately decremented in ax25_release().
Solution(s)
- ubuntu-upgrade-linux-image-5-4-0-1121-raspi
- ubuntu-upgrade-linux-image-5-4-0-1125-kvm
- ubuntu-upgrade-linux-image-5-4-0-1141-gcp
- ubuntu-upgrade-linux-image-5-4-0-204-generic
- ubuntu-upgrade-linux-image-5-4-0-204-generic-lpae
- ubuntu-upgrade-linux-image-5-4-0-204-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1010-gke
- ubuntu-upgrade-linux-image-6-8-0-1011-raspi
- ubuntu-upgrade-linux-image-6-8-0-1012-ibm
- ubuntu-upgrade-linux-image-6-8-0-1012-oem
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1014-azure
- ubuntu-upgrade-linux-image-6-8-0-1014-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1014-gcp
- ubuntu-upgrade-linux-image-6-8-0-1015-aws
- ubuntu-upgrade-linux-image-6-8-0-44-generic
- ubuntu-upgrade-linux-image-6-8-0-44-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-45-generic
- ubuntu-upgrade-linux-image-6-8-0-45-generic-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-gcp-lts-20-04
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-18-04
- ubuntu-upgrade-linux-image-generic-hwe-22-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-6-8
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-64k-6-8
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem
- ubuntu-upgrade-linux-image-oem-22-04
- ubuntu-upgrade-linux-image-oem-22-04a
- ubuntu-upgrade-linux-image-oem-22-04b
- ubuntu-upgrade-linux-image-oem-22-04c
- ubuntu-upgrade-linux-image-oem-22-04d
- ubuntu-upgrade-linux-image-oem-osp1
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-raspi2
- ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-18-04
- ubuntu-upgrade-linux-image-virtual-hwe-22-04
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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