Linux Kernel Security Vulnerabilities

CVE-2021-47561

In the Linux kernel, the following vulnerability has been resolved: i2c: virtio: disable timeout handling If a timeout is hit, it can result is incorrect data on the I2C busand/or memory corruptions in the guest since the device can still beoperating on the buffers it was given while the guest has ...

CVE-2021-47562

In the Linux kernel, the following vulnerability has been resolved: ice: fix vsi->txq_map sizing The approach of having XDP queue per CPU regardless of user's settingexposed a hidden bug that could occur in case when Rx queue count differfrom Tx queue count. Currently vsi->txq_map's size is e...

CVE-2021-47563

In the Linux kernel, the following vulnerability has been resolved: ice: avoid bpf_prog refcount underflow Ice driver has the routines for managing XDP resources that are sharedbetween ndo_bpf op and VSI rebuild flow. The latter takes place forexample when user changes queue count on an interface v...

CVE-2021-47564

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix double free issue on err path fix error path handling in prestera_bridge_port_join() thatcases prestera driver to crash (see below). Trace:Internal error: Oops: 96000044 [#1] SMPModules linked in: preste...

CVE-2021-47565

In the Linux kernel, the following vulnerability has been resolved: scsi: mpt3sas: Fix kernel panic during drive powercycle test While looping over shost's sdev list it is possible that oneof the drives is getting removed and its sas_target object isfreed but its sdev object remains intact. Consequ...

CVE-2021-47566

In the Linux kernel, the following vulnerability has been resolved: proc/vmcore: fix clearing user buffer by properly using clear_user() To clear a user buffer we cannot simply use memset, we have to useclear_user(). With a virtio-mem device that registers a vmcore_cb andhas some logically unplugge...

CVE-2021-47567

In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do notactivate MMU before reading task struct") a vmap stack overflowresults in a hard lockup. This is because emergency...

CVE-2021-47568

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix memleak in get_file_stream_info() Fix memleak in get_file_stream_info()

CVE-2021-47569

In the Linux kernel, the following vulnerability has been resolved: io_uring: fail cancellation for EXITING tasks WARNING: CPU: 1 PID: 20 at fs/io_uring.c:6269 io_try_cancel_userdata+0x3c5/0x640 fs/io_uring.c:6269CPU: 1 PID: 20 Comm: kworker/1:0 Not tainted 5.16.0-rc1-syzkaller #0Workqueue: events ...

CVE-2021-47570

In the Linux kernel, the following vulnerability has been resolved: staging: r8188eu: fix a memory leak in rtw_wx_read32() Free "ptmp" before returning -EINVAL.

CVE-2021-47571

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8192e: Fix use after free in _rtl92e_pci_disconnect() The free_rtllib() function frees the "dev" pointer so there is useafter free on the next line. Re-arrange things to avoid that.

CVE-2021-47572

In the Linux kernel, the following vulnerability has been resolved: net: nexthop: fix null pointer dereference when IPv6 is not enabled When we try to add an IPv6 nexthop and IPv6 is not enabled(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error pathof nh_create_ipv6() due to callin...

CVE-2021-47576

In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() In resp_mode_select() sanity check the block descriptor len to avoid UAF. BUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_deb...

CVE-2021-47577

In the Linux kernel, the following vulnerability has been resolved: io-wq: check for wq exit after adding new worker task_work We check IO_WQ_BIT_EXIT before attempting to create a new worker, andwq exit cancels pending work if we have any. But it's possible to havea race between the two, where cre...

CVE-2021-47578

In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Don't call kcalloc() if size arg is zero If the size arg to kcalloc() is zero, it returns ZERO_SIZE_PTR. Because ofthat, for a following NULL pointer check to work on the returned pointer,kcalloc() must not be cal...

CVE-2021-47579

In the Linux kernel, the following vulnerability has been resolved: ovl: fix warning in ovl_create_real() Syzbot triggered the following warning in ovl_workdir_create() ->ovl_create_real(): if (!err && WARN_ON(!newdentry->d_inode)) { The reason is that the cgroup2 filesystem returns from mkdi...

CVE-2021-47580

In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Fix type in min_t to avoid stack OOB Change min_t() to use type "u32" instead of type "int" to avoid stack outof bounds. With min_t() type "int" the values get sign extended and thelarger value gets used causing s...

CVE-2021-47582

In the Linux kernel, the following vulnerability has been resolved: USB: core: Make do_proc_control() and do_proc_bulk() killable The USBDEVFS_CONTROL and USBDEVFS_BULK ioctls invokeusb_start_wait_urb(), which contains an uninterruptible wait with auser-specified timeout value. If timeout value is ...

CVE-2021-47583

In the Linux kernel, the following vulnerability has been resolved: media: mxl111sf: change mutex_init() location Syzbot reported, that mxl111sf_ctrl_msg() uses uninitializedmutex. The problem was in wrong mutex_init() location. Previous mutex_init(&state->msg_lock) call was in ->init() funct...

CVE-2021-47584

In the Linux kernel, the following vulnerability has been resolved: iocost: Fix divide-by-zero on donation from low hweight cgroup The donation calculation logic assumes that the donor has non-zeroafter-donation hweight, so the lowest active hweight a donating cgroup canhave is 2 so that it can don...

CVE-2021-47585

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory leak in __add_inode_ref() Line 1169 (#3) allocates a memory chunk for victim_name by kmalloc(),but when the function returns in line 1184 (#4) victim_name allocatedby line 1169 (#3) is not freed, which will lead t...

CVE-2021-47586

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup KASAN reports an out-of-bounds read in rk_gmac_setup on the line: while (ops->regs[i]) { This happens for most platforms since the regs flexible array member isempty, so the m...

CVE-2021-47587

In the Linux kernel, the following vulnerability has been resolved: net: systemport: Add global locking for descriptor lifecycle The descriptor list is a shared resource across all of the transmit queues, andthe locking mechanism used today only protects concurrency across a giventransmit queue bet...

CVE-2021-47588

In the Linux kernel, the following vulnerability has been resolved: sit: do not call ipip6_dev_free() from sit_init_net() ipip6_dev_free is sit dev->priv_destructor, already calledby register_netdevice() if something goes wrong. Alternative would be to make ipip6_dev_free() robust againstmultipl...

CVE-2021-47589

In the Linux kernel, the following vulnerability has been resolved: igbvf: fix double free in igbvf_probe In igbvf_probe, if register_netdev() fails, the program will go tolabel err_hw_init, and then to label err_ioremap. In free_netdev() whichis just below label err_ioremap, there is list_for_each...

CVE-2021-47590

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix deadlock in __mptcp_push_pending() __mptcp_push_pending() may call mptcp_flush_join_list() with subflowsocket lock held. If such call hits mptcp_sockopt_sync_all() thensubsequently __mptcp_sockopt_sync() could try to loc...

CVE-2021-47591

In the Linux kernel, the following vulnerability has been resolved: mptcp: remove tcp ulp setsockopt support TCP_ULP setsockopt cannot be used for mptcp because its alreadyused internally to plumb subflow (tcp) sockets to the mptcp layer. syzbot managed to trigger a crash for mptcp connections that...

CVE-2021-47592

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix tc flower deletion for VLAN priority Rx steering To replicate the issue:- Add 1 flower filter for VLAN Priority based frame steering:-$ IFDEVNAME=eth0$ tc qdisc add dev $IFDEVNAME ingress$ tc qdisc add dev $IFDEVNA...

CVE-2021-47593

In the Linux kernel, the following vulnerability has been resolved: mptcp: clear 'kern' flag from fallback sockets The mptcp ULP extension relies on sk->sk_sock_kern being set correctly:It prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); fromworking for plain tcp sockets (any userspace...

CVE-2021-47594

In the Linux kernel, the following vulnerability has been resolved: mptcp: never allow the PM to close a listener subflow Currently, when deleting an endpoint the netlink PM treversesall the local MPTCP sockets, regardless of their status. If an MPTCP listener socket is bound to the IP matching the...

CVE-2021-47595

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_ets: don't remove idle classes from the round-robin list Shuang reported that the following script: tc qdisc add dev ddd0 handle 10: parent 1: ets bands 8 strict 4 priomap 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 mausezahn dd...

CVE-2021-47596

In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg Currently, the hns3_remove function firstly uninstall client instance,and then uninstall acceletion engine device. The netdevice is freed inclient instance uninstall process...

CVE-2021-47597

In the Linux kernel, the following vulnerability has been resolved: inet_diag: fix kernel-infoleak for UDP sockets KMSAN reported a kernel-infoleak [1], that can exploitedby unpriv users. After analysis it turned out UDP was not initializingr->idiag_expires. Other users of inet_sk_diag_fill()mig...

CVE-2021-47598

In the Linux kernel, the following vulnerability has been resolved: sch_cake: do not call cake_destroy() from cake_init() qdiscs are not supposed to call their own destroy() methodfrom init(), because core stack already does that. syzbot was able to trigger use after free: DEBUG_LOCKS_WARN_ON(lock-...

CVE-2021-47599

In the Linux kernel, the following vulnerability has been resolved: btrfs: use latest_dev in btrfs_show_devname The test case btrfs/238 reports the warning below: WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs]CPU: 2 PID: 1 Comm: systemd Tainted: G W O 5.14....

CVE-2021-47600

In the Linux kernel, the following vulnerability has been resolved: dm btree remove: fix use after free in rebalance_children() Move dm_tm_unlock() after dm_tm_dec().

CVE-2021-47601

In the Linux kernel, the following vulnerability has been resolved: tee: amdtee: fix an IS_ERR() vs NULL bug The __get_free_pages() function does not return error pointers it returnsNULL so fix this condition to avoid a NULL dereference.

CVE-2021-47602

In the Linux kernel, the following vulnerability has been resolved: mac80211: track only QoS data frames for admission control For admission control, obviously all of that only works forQoS data frames, otherwise we cannot even access the QoSfield in the header. Syzbot reported (see below) an unini...

CVE-2021-47603

In the Linux kernel, the following vulnerability has been resolved: audit: improve robustness of the audit queue handling If the audit daemon were ever to get stuck in a stopped state thekernel's kauditd_thread() could get blocked attempting to send auditrecords to the userspace audit daemon. With ...

CVE-2021-47604

In the Linux kernel, the following vulnerability has been resolved: vduse: check that offset is within bounds in get_config() This condition checks "len" but it does not check "offset" and thatcould result in an out of bounds read if "offset > dev->config_size".The problem is that since both ...

CVE-2021-47605

In the Linux kernel, the following vulnerability has been resolved: vduse: fix memory corruption in vduse_dev_ioctl() The "config.offset" comes from the user. There needs to a check toprevent it being out of bounds. The "config.offset" and"dev->config_size" variables are both type u32. So if the...

CVE-2021-47606

In the Linux kernel, the following vulnerability has been resolved: net: netlink: af_netlink: Prevent empty skb by adding a check on len. Adding a check on len parameter to avoid empty skb. This prevents adivision error in netem_enqueue function which is caused when skb->len=0and skb->data_le...

CVE-2021-47607

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix kernel address leakage in atomic cmpxchg's r0 aux reg The implementation of BPF_CMPXCHG on a high level has the following parameters: .-[old-val] .-[new-val]BPF_R0 = cmpxchg{32,64}(DST_REG + insn->off, BPF_R0, SRC_REG)-...

CVE-2021-47608

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix kernel address leakage in atomic fetch The change in commit 37086bfdc737 ("bpf: Propagate stack bounds to registersin atomics w/ BPF_FETCH") around check_mem_access() handling is buggy sincethis would allow for unprivilege...

CVE-2021-47609

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scpi: Fix string overflow in SCPI genpd driver Without the bound checks for scpi_pd->name, it could result in the bufferoverflow when copying the SCPI device name from the corresponding devicetree node as the name ...

CVE-2021-47610

In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix null ptr access msm_ioctl_gem_submit() Fix the below null pointer dereference in msm_ioctl_gem_submit(): 26545.260705: Call trace:26545.263223: kref_put+0x1c/0x6026545.266452: msm_ioctl_gem_submit+0x254/0x74426545.2709...

CVE-2021-47611

In the Linux kernel, the following vulnerability has been resolved: mac80211: validate extended element ID is present Before attempting to parse an extended element, verify thatthe extended element ID is present.

CVE-2021-47612

In the Linux kernel, the following vulnerability has been resolved: nfc: fix segfault in nfc_genl_dump_devices_done When kmalloc in nfc_genl_dump_devices() fails thennfc_genl_dump_devices_done() segfaults as below KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]CPU: 0 PID: 25 ...

CVE-2021-47613

In the Linux kernel, the following vulnerability has been resolved: i2c: virtio: fix completion handling The driver currently assumes that the notify callback is only receivedwhen the device is done with all the queued buffers. However, this is not true, since the notify callback could be calledwit...

CVE-2021-47614

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix a user-after-free in add_pble_prm When irdma_hmc_sd_one fails, 'chunk' is freed while its still on the PBLEinfo list. Add the chunk entry to the PBLE info list only after successful setting ofthe SD in irdma_hmc_sd_...