Linux Kernel Security Vulnerabilities

CVE-2021-47072

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix removed dentries still existing after log is synced When we move one inode from one directory to another and both the inodeand its previous parent directory were logged before, we are not supposedto have the dentry for t...

CVE-2021-47073

In the Linux kernel, the following vulnerability has been resolved: platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios init_dell_smbios_wmi() only registers the dell_smbios_wmi_driver on systemswhere the Dell WMI interface is supported. While exit_dell_smbios_wmi()unregisters it unconditi...

CVE-2021-47074

In the Linux kernel, the following vulnerability has been resolved: nvme-loop: fix memory leak in nvme_loop_create_ctrl() When creating loop ctrl in nvme_loop_create_ctrl(), if nvme_init_ctrl()fails, the loop ctrl should be freed before jumping to the "out" label.

CVE-2021-47075

In the Linux kernel, the following vulnerability has been resolved: nvmet: fix memory leak in nvmet_alloc_ctrl() When creating ctrl in nvmet_alloc_ctrl(), if the cntlid_min is largerthan cntlid_max of the subsystem, and jumps to the"out_free_changed_ns_list" label, but the ctrl->sqs lack of be f...

CVE-2021-47076

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Return CQE error if invalid lkey was supplied RXE is missing update of WQE status in LOCAL_WRITE failures. This causedthe following kernel panic if someone sent an atomic operation with anexplicitly wrong lkey. [leonro@vm...

CVE-2021-47077

In the Linux kernel, the following vulnerability has been resolved: scsi: qedf: Add pointer checks in qedf_update_link_speed() The following trace was observed: [ 14.042059] Call Trace:[ 14.042061] <IRQ>[ 14.042068] qedf_link_update+0x144/0x1f0 [qedf][ 14.042117] qed_link_update+0x5c/0x80 [qe...

CVE-2021-47078

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Clear all QP fields if creation failed rxe_qp_do_cleanup() relies on valid pointer values in QP for the properlycreated ones, but in case rxe_qp_from_init() failed it was filled withgarbage and caused tot the following er...

CVE-2021-47079

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ideapad-laptop: fix a NULL pointer dereference The third parameter of dytc_cql_command should not be NULL since it willbe dereferenced immediately.

CVE-2021-47080

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Prevent divide-by-zero error triggered by the user The user_entry_size is supplied by the user and later used as adenominator to calculate number of entries. The zero supplied by the userwill trigger the following divide...

CVE-2021-47081

In the Linux kernel, the following vulnerability has been resolved: habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory Our code analyzer reported a uaf. In gaudi_memset_device_memory, cb is get via hl_cb_kernel_create()with 2 refcount.If hl_cs_allocate_job() failed, the ...

CVE-2021-47082

In the Linux kernel, the following vulnerability has been resolved: tun: avoid double free in tun_free_netdev Avoid double free in tun_free_netdev() by moving thedev->tstats and tun->security allocs to a new ndo_init routine(tun_net_init()) that will be called by register_netdevice().ndo_init...

CVE-2021-47083

In the Linux kernel, the following vulnerability has been resolved: pinctrl: mediatek: fix global-out-of-bounds issue When eint virtual eint number is greater than gpio number,it maybe produce 'desc[eint_n]' size globle-out-of-bounds issue.

CVE-2021-47086

In the Linux kernel, the following vulnerability has been resolved: phonet/pep: refuse to enable an unbound pipe This ioctl() implicitly assumed that the socket was already bound toa valid local socket name, i.e. Phonet object. If the socket was notbound, two separate problems would occur: We'd sen...

CVE-2021-47087

In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix incorrect page free bug Pointer to the allocated pages (struct page *page) has alreadyprogressed towards the end of allocation. It is incorrect to perform__free_pages(page, order) using this pointer as we would free...

CVE-2021-47088

In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: protect targets destructions with kdamond_lock DAMON debugfs interface iterates current monitoring targets in'dbgfs_target_ids_read()' while holding the corresponding'kdamond_lock'. However, it also destructs the mo...

CVE-2021-47089

In the Linux kernel, the following vulnerability has been resolved: kfence: fix memory leak when cat kfence objects Hulk robot reported a kmemleak problem: unreferenced object 0xffff93d1d8cc02e8 (size 248): comm "cat", pid 23327, jiffies 4624670141 (age 495992.217s) hex dump (first 32 bytes): 00 40...

CVE-2021-47090

In the Linux kernel, the following vulnerability has been resolved: mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page() Hulk Robot reported a panic in put_page_testzero() when testingmadvise() with MADV_SOFT_OFFLINE. The BUG() is triggered when retryingget_any_page(). This is becau...

CVE-2021-47091

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix locking in ieee80211_start_ap error path We need to hold the local->mtx to release the channel context,as even encoded by the lockdep_assert_held() there. Fix it.

CVE-2021-47092

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Always clear vmx->fail on emulation_required Revert a relatively recent change that set vmx->fail if the vCPU is in L2and emulation_required is true, as that behavior is completely bogus.Setting vmx->fail and syn...

CVE-2021-47093

In the Linux kernel, the following vulnerability has been resolved: platform/x86: intel_pmc_core: fix memleak on registration failure In case device registration fails during module initialisation, theplatform device structure needs to be freed using platform_device_put()to properly free all resour...

CVE-2021-47094

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Don't advance iterator after restart due to yielding After dropping mmu_lock in the TDP MMU, restart the iterator duringtdp_iter_next() and do not advance the iterator. Advancing the iteratorresults in skipping the to...

CVE-2021-47095

In the Linux kernel, the following vulnerability has been resolved: ipmi: ssif: initialize ssif_info->client early During probe ssif_info->client is dereferenced in error path. However,it is set when some of the error checking has already been done. Thiscauses following kernel crash if an err...

CVE-2021-47096

In the Linux kernel, the following vulnerability has been resolved: ALSA: rawmidi - fix the uninitalized user_pversion The user_pversion was uninitialized for the user space file structurein the open function, because the file private structure usekmalloc for the allocation. The kernel ALSA sequenc...

CVE-2021-47097

In the Linux kernel, the following vulnerability has been resolved: Input: elantech - fix stack out of bound access in elantech_change_report_id() The array param[] in elantech_change_report_id() must be at least 3bytes, because elantech_read_reg_params() is calling ps2_command() withPSMOUSE_CMD_GE...

CVE-2021-47098

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations Commit b50aa49638c7 ("hwmon: (lm90) Prevent integer underflows oftemperature calculations") addressed a number of underflow situationswhen writing temperat...

CVE-2021-47099

In the Linux kernel, the following vulnerability has been resolved: veth: ensure skb entering GRO are not cloned. After commit d3256efd8e8b ("veth: allow enabling NAPI even without XDP"),if GRO is enabled on a veth device and TSO is disabled on the peerdevice, TCP skbs will go through the NAPI call...

CVE-2021-47100

In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix UAF when uninstall ipmi_si and ipmi_msghandler module Hi, When testing install and uninstall of ipmi_si.ko and ipmi_msghandler.ko,the system crashed. The log as follows:[ 141.087026] BUG: unable to handle kernel paging re...

CVE-2021-47101

In the Linux kernel, the following vulnerability has been resolved: asix: fix uninit-value in asix_mdio_read() asix_read_cmd() may read less than sizeof(smsr) bytes and in this casesmsr will be uninitialized. Fail log:BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:...

CVE-2021-47102

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix incorrect structure access In line:upper = info->upper_dev;We access upper_dev field, which is related only for particular events(e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memorya...

CVE-2021-47103

In the Linux kernel, the following vulnerability has been resolved: inet: fully convert sk->sk_rx_dst to RCU rules syzbot reported various issues around early demux,one being included in this changelog [1] sk->sk_rx_dst is using RCU protection without clearlydocumenting it. And following sequ...

CVE-2021-47104

In the Linux kernel, the following vulnerability has been resolved: IB/qib: Fix memory leak in qib_user_sdma_queue_pkts() The wrong goto label was used for the error case and missed cleanup of thepkt allocation. Addresses-Coverity-ID: 1493352 ("Resource leak")

CVE-2021-47105

In the Linux kernel, the following vulnerability has been resolved: ice: xsk: return xsk buffers back to pool when cleaning the ring Currently we only NULL the xdp_buff pointer in the internal SW ring butwe never give it back to the xsk buffer pool. This means that bufferscan be leaked out of the b...

CVE-2021-47106

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy() We need to use list_for_each_entry_safe() iteratorbecause we can not access @catchall after kfree_rcu() call. syzbot reported: BUG: KASAN: use-after-free in nft...

CVE-2021-47107

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix READDIR buffer overflow If a client sends a READDIR count argument that is too small (say,zero), then the buffer size calculation in the new init_dirlisthelper functions results in an underflow, allowing the XDR streamfun...

CVE-2021-47108

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf In commit 41ca9caaae0b("drm/mediatek: hdmi: Add check for CEA modes only") a checkfor CEA modes was added to function mtk_hdmi_bridge_mode_valid()in order to address ...

CVE-2021-47109

In the Linux kernel, the following vulnerability has been resolved: neighbour: allow NUD_NOARP entries to be forced GCed IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible tofill up the neighbour table with enough entries that it will overflow forvalid connections after that. ...

CVE-2021-47110

In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and thisonly happens for boot CPU. We need to disable it for all CPUs toguard against memory corruption e.g. on restore fr...

CVE-2021-47111

In the Linux kernel, the following vulnerability has been resolved: xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the threadreturns (which can be triggered by the frontend) before the call tokthread_stop done as part of the backend tear...

CVE-2021-47112

In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Teardown PV features on boot CPU as well Various PV features (Async PF, PV EOI, steal time) work through memoryshared with hypervisor and when we restore from hibernation we mustproperly teardown all these features to make...

CVE-2021-47113

In the Linux kernel, the following vulnerability has been resolved: btrfs: abort in rename_exchange if we fail to insert the second ref Error injection stress uncovered a problem where we'd leave a danglinginode ref if we failed during a rename_exchange. This happens becausewe insert the inode ref ...

CVE-2021-47114

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix data corruption by fallocate When fallocate punches holes out of inode size, if original isize is inthe middle of last cluster, then the part from isize to the end of thecluster will be zeroed with buffer write, at that ...

CVE-2021-47116

In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_mb_init_backend on error path. Fix a memory leak discovered by syzbot when a file system is corruptedwith an illegally large s_log_groups_per_flex.

CVE-2021-47117

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault:[130747.323114] kernel BUG at fs/ext4/extents_status.c:762![130747.323117] Internal error: Oops ...

CVE-2021-47118

In the Linux kernel, the following vulnerability has been resolved: pid: take a reference when initializing cad_pid During boot, kernel_init_freeable() initializes cad_pid to the inittask's struct pid. Later on, we may change cad_pid via a sysctl, andwhen this happens proc_do_cad_pid() will increme...

CVE-2021-47119

In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_fill_super Buffer head references must be released before calling kill_bdev();otherwise the buffer head (and its page referenced by b_data) will notbe freed by kill_bdev, and subsequently that bh will ...

CVE-2021-47120

In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: fix NULL-deref on disconnect Commit 9d7b18668956 ("HID: magicmouse: add support for Apple MagicTrackpad 2") added a sanity check for an Apple trackpad but returnedsuccess instead of -ENODEV when the check failed. T...

CVE-2021-47121

In the Linux kernel, the following vulnerability has been resolved: net: caif: fix memory leak in cfusbl_device_notify In case of caif_enroll_dev() fail, allocatedlink_support won't be assigned to the correspondingstructure. So simply free allocated pointer in caseof error.

CVE-2021-47122

In the Linux kernel, the following vulnerability has been resolved: net: caif: fix memory leak in caif_device_notify In case of caif_enroll_dev() fail, allocatedlink_support won't be assigned to the correspondingstructure. So simply free allocated pointer in caseof error

CVE-2021-47123

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix ltout double free on completion race Always remove linked timeout on io_link_timeout_fn() from the masterrequest link list, otherwise we may get use-after-free when firstio_link_timeout_fn() puts linked timeout in the...

CVE-2021-47124

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28Call Trace:__refcount_sub_and_test in...