Linux Kernel Security Vulnerabilities

CVE-2021-47231

In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: fix memory leak in mcba_usb Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUSAnalyzer Tool. The problem was in unfreed usb_coherent. In mcba_usb_start() 20 coherent buffers are allocated and there...

CVE-2021-47232

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue,without incrementing the ref count. This leads to a ...

CVE-2021-47233

In the Linux kernel, the following vulnerability has been resolved: regulator: rt4801: Fix NULL pointer dereference if priv->enable_gpios is NULL devm_gpiod_get_array_optional may return NULL if no GPIO was assigned.

CVE-2021-47234

In the Linux kernel, the following vulnerability has been resolved: phy: phy-mtk-tphy: Fix some resource leaks in mtk_phy_init() Use clk_disable_unprepare() in the error path of mtk_phy_init() to fixsome resource leaks.

CVE-2021-47235

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: fix potential use-after-free in ec_bhf_remove static void ec_bhf_remove(struct pci_dev *dev){...struct ec_bhf_priv *priv = netdev_priv(net_dev); unregister_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv...

CVE-2021-47236

In the Linux kernel, the following vulnerability has been resolved: net: cdc_eem: fix tx fixup skb leak when usbnet transmit a skb, eem fixup it in eem_tx_fixup(),if skb_copy_expand() failed, it return NULL,usbnet_start_xmit() will have no chance to free original skb. fix it by free orginal skb in ...

CVE-2021-47237

In the Linux kernel, the following vulnerability has been resolved: net: hamradio: fix memory leak in mkiss_close My local syzbot instance hit memory leak inmkiss_open()[1]. The problem was in missingfree_netdev() in mkiss_close(). In mkiss_open() netdevice is allocated and thenregistered, but in m...

CVE-2021-47238

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix memory leak in ip_mc_add1_src BUG: memory leakunreferenced object 0xffff888101bc4c00 (size 32):comm "syz-executor527", pid 360, jiffies 4294807421 (age 19.329s)hex dump (first 32 bytes):00 00 00 00 00 00 00 00 00 00 ...

CVE-2021-47239

In the Linux kernel, the following vulnerability has been resolved: net: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind")fails to clean up the work scheduled in smsc75xx_reset->smsc75xx_set_multicast, which leads to use-afte...

CVE-2021-47240

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read inqrtr_endpoint_post. The problem was in wrongsize type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfff...

CVE-2021-47241

In the Linux kernel, the following vulnerability has been resolved: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for.This may result in ETHTOOL_MSG_STRSET_GET producing a warning like: calculated message payload length (684) not suffici...

CVE-2021-47242

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix soft lookup in subflow_error_report() Maxim reported a soft lookup in subflow_error_report(): watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0]RIP: 0010:native_queued_spin_lock_slowpathRSP: 0018:ffffa859c00...

CVE-2021-47243

In the Linux kernel, the following vulnerability has been resolved: sch_cake: Fix out of bounds when parsing TCP options and header The TCP option parser in cake qdisc (cake_get_tcpopt andcake_tcph_may_drop) could read one byte out of bounds. When the lengthis 1, the execution flow gets into the lo...

CVE-2021-47244

In the Linux kernel, the following vulnerability has been resolved: mptcp: Fix out of bounds when parsing TCP options The TCP option parser in mptcp (mptcp_get_options) could read one byteout of bounds. When the length is 1, the execution flow gets into theloop, reads one byte of the opcode, and if...

CVE-2021-47245

In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: Fix out of bounds when parsing TCP options The TCP option parser in synproxy (synproxy_parse_options) could readone byte out of bounds. When the length is 1, the execution flow getsinto the loop, reads one byte...

CVE-2021-47246

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix page reclaim for dead peer hairpin When adding a hairpin flow, a firmware-side send queue is created forthe peer net device, which claims some host memory pages for itsinternal ring buffer. If the peer net device is ...

CVE-2021-47247

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix use-after-free of encap entry in neigh update handler Function mlx5e_rep_neigh_update() wasn't updated to accommodate rtnl lockremoval from TC filter update path and properly handle concurrent encapentry insertion/de...

CVE-2021-47248

In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup().The root cause is udp_abort() racing with close(). Bothracing functions acquire the socket lock, but udp{v6}_destroy_sock()re...

CVE-2021-47249

In the Linux kernel, the following vulnerability has been resolved: net: rds: fix memory leak in rds_recvmsg Syzbot reported memory leak in rds. The problemwas in unputted refcount in case of error. int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,int msg_flags){... if (!rds_nex...

CVE-2021-47250

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix memory leak in netlbl_cipsov4_add_std Reported by syzkaller:BUG: memory leakunreferenced object 0xffff888105df7000 (size 64):comm "syz-executor842", pid 360, jiffies 4294824824 (age 22.546s)hex dump (first 32 bytes):...

CVE-2021-47251

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix skb length check in ieee80211_scan_rx() Replace hard-coded compile-time constants for header length checkwith dynamic determination based on the frame type. Otherwise, wehit a validation WARN_ON in cfg80211 later. [st...

CVE-2021-47252

In the Linux kernel, the following vulnerability has been resolved: batman-adv: Avoid WARN_ON timing related checks The soft/batadv interface for a queued OGM can be changed during the timethe OGM was queued for transmission and when the OGM is actuallytransmitted by the worker. But WARN_ON must be...

CVE-2021-47253

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix potential memory leak in DMUB hw_init [Why]On resume we perform DMUB hw_init which allocates memory:dm_resume->dm_dmub_hw_init->dc_dmub_srv_create->kzallocThat results in memory leak in suspend/resume ...

CVE-2021-47254

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() toremove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cle...

CVE-2021-47255

In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: Restore guard to prevent illegal APIC register access Per the SDM, "any access that touches bytes 4 through 15 of an APICregister may cause undefined behavior and must not be executed."Worse, such an access in kvm_lapic...

CVE-2021-47256

In the Linux kernel, the following vulnerability has been resolved: mm/memory-failure: make sure wait for page writeback in memory_failure Our syzkaller trigger the "BUG_ON(!list_empty(&inode->i_wb_list))" inclear_inode: kernel BUG at fs/inode.c:519!Internal error: Oops - BUG: 0 [#1] SMPModules ...

CVE-2021-47257

In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: fix null deref in parse dev addr Fix a logic error that could result in a null deref if the user setsthe mode incorrectly for the given addr type.

CVE-2021-47258

In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix error handling of scsi_host_alloc() After device is initialized via device_initialize(), or its name is set viadev_set_name(), the device has to be freed via put_device(). Otherwisedevice name will be leaked because...

CVE-2021-47259

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix use-after-free in nfs4_init_client() KASAN reports a use-after-free when attempting to mount two differentexports through two different NICs that belong to the same server. Olga was able to hit this with kernels starting s...

CVE-2021-47260

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a potential NULL dereference in nfs_get_client() None of the callers are expecting NULL returns from nfs_get_client() sothis code will lead to an Oops. It's better to return an errorpointer. I expect that this is dead code...

CVE-2021-47261

In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Fix initializing CQ fragments buffer The function init_cq_frag_buf() can be called to initialize the current CQfragments buffer cq->buf, or the temporary cq->resize_buf that is filledduring CQ resize operation. Howev...

CVE-2021-47262

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Ensure liveliness of nested VM-Enter fail tracepoint message Use the __string() machinery provided by the tracing subystem to make acopy of the string literals consumed by the "nested VM-Enter failed"tracepoint. A complet...

CVE-2021-47263

In the Linux kernel, the following vulnerability has been resolved: gpio: wcd934x: Fix shift-out-of-bounds error bit-mask for pins 0 to 4 is BIT(0) to BIT(4) however we ended up with BIT(n - 1)which is not right, and this was caught by below usban check UBSAN: shift-out-of-bounds in drivers/gpio/gp...

CVE-2021-47264

In the Linux kernel, the following vulnerability has been resolved: ASoC: core: Fix Null-point-dereference in fmt_single_name() Check the return value of devm_kstrdup() in case ofNull-point-dereference.

CVE-2021-47265

In the Linux kernel, the following vulnerability has been resolved: RDMA: Verify port when creating flow rule Validate port value provided by the user and with that remove no longerneeded validation by the driver. The missing check in the mlx5_ib drivercould cause to the below oops. Call trace:_cre...

CVE-2021-47266

In the Linux kernel, the following vulnerability has been resolved: RDMA/ipoib: Fix warning caused by destroying non-initial netns After the commit 5ce2dced8e95 ("RDMA/ipoib: Set rtnl_link_ops for ipoibinterfaces"), if the IPoIB device is moved to non-initial netns,destroying that netns lets the de...

CVE-2021-47267

In the Linux kernel, the following vulnerability has been resolved: usb: fix various gadget panics on 10gbps cabling usb_assign_descriptors() is called with 5 parameters,the last 4 of which are the usb_descriptor_header for:full-speed (USB1.1 - 12Mbps [including USB1.0 low-speed @ 1.5Mbps),high-spe...

CVE-2021-47268

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: cancel vdm and state machine hrtimer when unregister tcpm port A pending hrtimer may expire after the kthread_worker of tcpm portis destroyed, see below kernel dump when do module unload, fix itby cancel the 2 hrt...

CVE-2021-47269

In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: ep0: fix NULL pointer exception There is no validation of the index from dwc3_wIndex_to_dep() and we mightbe referring a non-existing ep and trigger a NULL pointer exception. Incertain configurations we might use fewer e...

CVE-2021-47270

In the Linux kernel, the following vulnerability has been resolved: usb: fix various gadgets null ptr deref on 10gbps cabling. This avoids a null pointer dereference inf_{ecm,eem,hid,loopback,printer,rndis,serial,sourcesink,subset,tcm}by simply reusing the 5gbps config for 10gbps.

CVE-2021-47271

In the Linux kernel, the following vulnerability has been resolved: usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler Patch fixes the following critical issue caused by deadlock which has beendetected during testing NCM class: smp: csd: Detected non-responsive CSD lock (#1) on CPU#0smp: cs...

CVE-2021-47272

In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: Bail from dwc3_gadget_exit() if dwc->gadget is NULL There exists a possible scenario in which dwc3_gadget_init() can fail:during during host -> peripheral mode switch in dwc3_set_mode(), anda pending gadget...

CVE-2021-47273

In the Linux kernel, the following vulnerability has been resolved: usb: dwc3-meson-g12a: fix usb2 PHY glue init when phy0 is disabled When only PHY1 is used (for example on Odroid-HC4), the regmap init codeuses the usb2 ports when doesn't initialize the PHY1 regmap entry. This fixes:Unable to hand...

CVE-2021-47274

In the Linux kernel, the following vulnerability has been resolved: tracing: Correct the length check which causes memory corruption We've suffered from severe kernel crashes due to memory corruption onour production environment, like, Call Trace:[1640542.554277] general protection fault: 0000 [#1]...

CVE-2021-47275

In the Linux kernel, the following vulnerability has been resolved: bcache: avoid oversized read request in cache missing code path In the cache missing code path of cached device, if a proper locationfrom the internal B+ tree is matched for a cache miss range, functioncached_dev_cache_miss() will ...

CVE-2021-47276

In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used forupdating into a nop in ftrace_init(), but the error path (rightfully)returned -EINVAL and not -EFA...

CVE-2021-47277

In the Linux kernel, the following vulnerability has been resolved: kvm: avoid speculation-based attacks from out-of-range memslot accesses KVM's mechanism for accessing guest memory translates a guest physicaladdress (gpa) to a host virtual address using the right-shifted gpa(also known as gfn) an...

CVE-2021-47278

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove() This driver's remove path calls del_timer(). However, that functiondoes not wait until the timer handler finishes. This means that thetimer handler may still be...

CVE-2021-47279

In the Linux kernel, the following vulnerability has been resolved: usb: misc: brcmstb-usb-pinmap: check return value after calling platform_get_resource() It will cause null-ptr-deref if platform_get_resource() returns NULL,we need check the return value.

CVE-2021-47280

In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() dueto retrieving file_priv->master prior to locking the device's mastermutex. An example can be seen in the crash r...