In the Linux kernel, the following vulnerability has been resolved:

bnxt: prevent skb UAF after handing over to PTP worker

When reading the timestamp is required bnxt_tx_int() hands over the ownership of the completed skb to the PTP worker. The skb should not be used afterwards, as the worker may run before the rest of our code and free the skb, leading to a use-after-free.

Since dev_kfree_skb_any() accepts NULL make the loss of ownership more obvious and set skb to NULL.

In the Linux kernel, the following vulnerability has been resolved:

bnxt: prevent skb UAF after handing over to PTP worker

When reading the timestamp is required bnxt_tx_int() hands over the ownership of the completed skb to the PTP worker. The skb should not be used afterwards, as the worker may run before the rest of our code and free the skb, leading to a use-after-free.

Since dev_kfree_skb_any() accepts NULL make the loss of ownership more obvious and set skb to NULL.

kernel: bnxt: prevent skb UAF after handing over to PTP worker kernel: block: null pointer dereference in ioctl.c when length and logical block size are misaligned kernel: PM / devfreq: Synchronize devfreq_monitor_[start/stop] kernel: scsi: libfc: Fix potential NULL pointer dereference in fc_lport_ptp_setup() kernel: SUNRPC: Fix UAF in svc_tcp_listen_data_ready() kernel: ext4: regenerate buddy after block freeing failed if under fc replay kernel: bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel kernel: scsi: qla2xxx: Fix double free of the ha->vp_map pointer kernel: ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses kernel: octeontx2-af: race condition on interupts kernel: nouveau: lock the client object tree. kernel: ipvlan: Dont Use skb->sk in ipvlan_process_v{4,6}_outbound kernel: vt: fix unicode buffer corruption when deleting characters kernel: mlxbf_gige: stop interface during shutdown kernel: netfilter: validate user input for expected length kernel: netfilter: complete validation of user input kernel: rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation kernel: i40e: fix vf may be used uninitialized in this function warning kernel: net: core: reject skb_copy(_expand) for fraglist GSO skbs kernel: drm/vmwgfx: Fix invalid reads in fence signaled events kernel: blk-cgroup: fix list corruption from reorder of WRITE ->lqueued kernel: blk-cgroup: fix list corruption from resetting io stat

Security update for the Linux Kernel

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 81 more

In the Linux kernel, the following vulnerability has been resolved: bnxt: prevent skb UAF after handing over to PTP worker When reading the timestamp is required bnxt_tx_int() hands over the ownership of the completed skb to the PTP worker. The skb should not be used afterwards, as the worker may run before the rest of our code and free the skb, leading to a use-after-free. Since dev_kfree_skb_any() accepts NULL make the loss of ownership more obvious and set skb to NULL.

Ein lokaler Angreifer kann diese Schwachstellen ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen oder einen nicht spezifizierten Angriff durchzuführen.