Linux Kernel Security Vulnerabilities

CVE-2021-47509

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Limit the period size to 16MB Set the practical limit to the period size (the fragment shift in OSS)instead of a full 31bit; a too large value could lead to the exhaustof memory as we allocate temporary buffers of t...

CVE-2021-47510

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix re-dirty process of tree-log nodes There is a report of a transaction abort of -EAGAIN with the followingscript. #!/bin/sh for d in sda sdb; domkfs.btrfs -d single -m single -f /dev/${d}done mount /dev/sda /mnt/testmount...

CVE-2021-47511

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix negative period/buffer sizes The period size calculation in OSS layer may receive a negative valueas an error, but the code there assumes only the positive values andhandle them with size_t. Due to that, a too b...

CVE-2021-47512

In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: prevent dismantle issue For some reason, fq_pie_destroy() did not copyworking code from pie_destroy() and other qdiscs,thus causing elusive bug. Before calling del_timer_sync(&q->adapt_timer),we need to ensure...

CVE-2021-47513

In the Linux kernel, the following vulnerability has been resolved: net: dsa: felix: Fix memory leak in felix_setup_mmio_filtering Avoid a memory leak if there is not a CPU port defined. Addresses-Coverity-ID: 1492897 ("Resource leak")Addresses-Coverity-ID: 1492899 ("Resource leak")

CVE-2021-47514

In the Linux kernel, the following vulnerability has been resolved: devlink: fix netns refcount leak in devlink_nl_cmd_reload() While preparing my patch series adding netns refcount tracking,I spotted bugs in devlink_nl_cmd_reload() Some error paths forgot to release a refcount on a netns. To fix t...

CVE-2021-47515

In the Linux kernel, the following vulnerability has been resolved: seg6: fix the iif in the IPv6 socket control block When an IPv4 packet is received, the ip_rcv_core(...) sets the receivinginterface index into the IPv4 socket control block (v5.16-rc4,net/ipv4/ip_input.c line 510): IPCB(skb)->i...

CVE-2021-47516

In the Linux kernel, the following vulnerability has been resolved: nfp: Fix memory leak in nfp_cpp_area_cache_add() In line 800 (#1), nfp_cpp_area_alloc() allocates and initializes aCPP area structure. But in line 807 (#2), when the cache is allocatedfailed, this CPP area structure is not freed, w...

CVE-2021-47517

In the Linux kernel, the following vulnerability has been resolved: ethtool: do not perform operations on net devices being unregistered There is a short period between a net device starts to be unregisteredand when it is actually gone. In that time frame ethtool operationscould still be performed,...

CVE-2021-47518

In the Linux kernel, the following vulnerability has been resolved: nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done The done() netlink callback nfc_genl_dump_ses_done() should check ifreceived argument is non-NULL, because its allocation could fail earlierin dumpit() (nfc_genl_dump_...

CVE-2021-47519

In the Linux kernel, the following vulnerability has been resolved: can: m_can: m_can_read_fifo: fix memory leak in error branch In m_can_read_fifo(), if the second call to m_can_fifo_read() fails,the function jump to the out_fail label and returns without callingm_can_receive_skb(). This means tha...

CVE-2021-47520

In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe.Especially, the can_frame cf which aliases skb memory is dereferencedjust after the call netif_receive_skb(skb). ...

CVE-2021-47521

In the Linux kernel, the following vulnerability has been resolved: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately,we can just use "pdev->irq" instead. Also we should check if at least one channel was set up.

CVE-2021-47522

In the Linux kernel, the following vulnerability has been resolved: HID: bigbenff: prevent null pointer dereference When emulating the device through uhid, there is a chance we don't haveoutput reports and so report_field is null.

CVE-2021-47523

In the Linux kernel, the following vulnerability has been resolved: IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr This buffer is currently allocated in hfi1_init(): if (reinit) ret = init_after_reset(dd); else ret = loadtime_init(dd); if (ret) goto done; /* allocate dummy tail memory for all receive...

CVE-2021-47524

In the Linux kernel, the following vulnerability has been resolved: serial: liteuart: fix minor-number leak on probe errors Make sure to release the allocated minor number before returning onprobe errors.

CVE-2021-47525

In the Linux kernel, the following vulnerability has been resolved: serial: liteuart: fix use-after-free and memleak on unbind Deregister the port when unbinding the driver to prevent it from beingused after releasing the driver data and leaking memory allocated byserial core.

CVE-2021-47526

In the Linux kernel, the following vulnerability has been resolved: serial: liteuart: Fix NULL pointer dereference in ->remove() drvdata has to be set in _probe() - otherwise platform_get_drvdata()causes null pointer dereference BUG in _remove().

CVE-2021-47527

In the Linux kernel, the following vulnerability has been resolved: serial: core: fix transmit-buffer reset and memleak Commit 761ed4a94582 ("tty: serial_core: convert uart_close to usetty_port_close") converted serial core to use tty_port_close() butfailed to notice that the transmit buffer still ...

CVE-2021-47528

In the Linux kernel, the following vulnerability has been resolved: usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init() In cdnsp_endpoint_init(), cdnsp_ring_alloc() is assigned to pep->ringand there is a dereference of it in cdnsp_endpoint_init(), which couldlead to a NULL pointe...

CVE-2021-47529

In the Linux kernel, the following vulnerability has been resolved: iwlwifi: Fix memory leaks in error handling path Should an error occur (invalid TLV len or memory allocation failure), thememory already allocated in 'reduce_power_data' should be freed beforereturning, otherwise it is leaking.

CVE-2021-47530

In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix wait_fence submitqueue leak We weren't dropping the submitqueue reference in all paths. Inparticular, when the fence has already been signalled. Split outa helper to simplify handling this in the various different retu...

CVE-2021-47531

In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix mmap to include VM_IO and VM_DONTDUMP In commit 510410bfc034 ("drm/msm: Implement mmap as GEM objectfunction") we switched to a new/cleaner method of doing things. That'sgood, but we missed a little bit. Before that co...

CVE-2021-47532

In the Linux kernel, the following vulnerability has been resolved: drm/msm/devfreq: Fix OPP refcnt leak

CVE-2021-47533

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: kms: Clear the HVS FIFO commit pointer once done Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before acommit") introduced a wait on the previous commit done on a given HVSFIFO. However, we never cleared ...

CVE-2021-47534

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: kms: Add missing drm_crtc_commit_put Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before acommit") introduced a global state for the HVS, with each FIFO storingthe current CRTC commit so that we can prop...

CVE-2021-47535

In the Linux kernel, the following vulnerability has been resolved: drm/msm/a6xx: Allocate enough space for GMU registers In commit 142639a52a01 ("drm/msm/a6xx: fix crashstate capture forA650") we changed a6xx_get_gmu_registers() to read 3 sets ofregisters. Unfortunately, we didn't change the memor...

CVE-2021-47536

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix wrong list_del in smc_lgr_cleanup_early smc_lgr_cleanup_early() meant to delete the linkgroup from the link group list, but it deletedthe list head by mistake. This may cause memory corruption since we didn'tremove the...

CVE-2021-47537

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: Fix a memleak bug in rvu_mbox_init() In rvu_mbox_init(), mbox_regions is not freed or passed outunder the switch-default region, which could lead to a memory leak. Fix this bug by changing 'return err' to 'goto free_r...

CVE-2021-47538

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() Need to call rxrpc_put_local() for peer candidate before kfree() as itholds a ref to rxrpc_local. [DH: v2: Changed to abstract the peer freeing code out into a function]

CVE-2021-47539

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle() Need to call rxrpc_put_peer() for bundle candidate before kfree() as itholds a ref to rxrpc_peer. [DH: v2: Changed to abstract out the bundle freeing code into a function]

CVE-2021-47540

In the Linux kernel, the following vulnerability has been resolved: mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode Fix the following NULL pointer dereference in mt7915_get_phy_moderoutine adding an ibss interface to the mt7915 driver. [ 101.137097] wlan0: Trigger new scan to find...

CVE-2021-47541

In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called andtmp->tx_cq will be freed on the error path of mlx4_en_copy_priv().After that mlx4_en_allo...

CVE-2021-47542

In the Linux kernel, the following vulnerability has been resolved: net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() In qlcnic_83xx_add_rings(), the indirect function ofahw->hw_ops->alloc_mbx_args will be called to allocate memory forcmd.req.arg, and there is a d...

CVE-2021-47544

In the Linux kernel, the following vulnerability has been resolved: tcp: fix page frag corruption on page fault Steffen reported a TCP stream corruption for HTTP requestsserved by the apache web-server using a cifs mount-pointand memory mapping the relevant file. The root cause is quite similar to ...

CVE-2021-47546

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix memory leak in fib6_rule_suppress The kernel leaks memory when a fib rule is present in IPv6 nftablesfirewall rules and a suppress_prefix rule is present in the IPv6 routingrules (used by certain tools such as wg-quick). ...

CVE-2021-47547

In the Linux kernel, the following vulnerability has been resolved: net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound In line 5001, if all id in the array 'lp->phy[8]' is not 0, when the'for' end, the 'k' is 8. At this time, the array 'lp->phy[8]' may be ou...

CVE-2021-47548

In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() The if statement:if (port >= DSAF_GE_NUM)return; limits the value of port less than DSAF_GE_NUM (i.e., 8).However, if the value...

CVE-2021-47549

In the Linux kernel, the following vulnerability has been resolved: sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl When the rmmod sata_fsl.ko command is executed in the PPC64 GNU/Linux,a bug is reported: BUG: Unable to handle kernel data access on read at 0x80000800805b502cOops: Kernel...

CVE-2021-47550

In the Linux kernel, the following vulnerability has been resolved: drm/amd/amdgpu: fix potential memleak In function amdgpu_get_xgmi_hive, when kobject_init_and_add failedThere is a potential memleak if not call kobject_put.

CVE-2021-47551

In the Linux kernel, the following vulnerability has been resolved: drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again In SRIOV configuration, the reset may failed to bring asic back to normal but stop cpschalready been called, the start_cpsch will not be called since there...

CVE-2021-47552

In the Linux kernel, the following vulnerability has been resolved: blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release() For avoiding to slow down queue destroy, we don't callblk_mq_quiesce_queue() in blk_cleanup_queue(), instead of delaying tocancel dispatch work in blk...

CVE-2021-47553

In the Linux kernel, the following vulnerability has been resolved: sched/scs: Reset task stack state in bringup_cpu() To hot unplug a CPU, the idle task on that CPU calls a few layers of Ccode before finally leaving the kernel. When KASAN is in use, poisonedshadow is left around for each of the ac...

CVE-2021-47554

In the Linux kernel, the following vulnerability has been resolved: vdpa_sim: avoid putting an uninitialized iova_domain The system will crash if we put an uninitialized iova_domain, thiscould happen when an error occurs before initializing the iova_domainin vdpasim_create(). BUG: kernel NULL point...

CVE-2021-47555

In the Linux kernel, the following vulnerability has been resolved: net: vlan: fix underflow for the real_dev refcnt Inject error before dev_hold(real_dev) in register_vlan_dev(),and execute the following testcase: ip link add dev dummy1 type dummyip link add name dummy1.100 link dummy1 type vlan i...

CVE-2021-47556

In the Linux kernel, the following vulnerability has been resolved: ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce() ethtool_set_coalesce() now uses both the .get_coalesce() and.set_coalesce() callbacks. But the check for their availability isbuggy, so changing the coalesce settin...

CVE-2021-47557

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_ets: don't peek at classes beyond 'nbands' when the number of DRR classes decreases, the round-robin active list cancontain elements that have already been freed in ets_qdisc_change(). As aconsequence, it's possible ...

CVE-2021-47558

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: Disable Tx queues when reconfiguring the interface The Tx queues were not disabled in situations where the driver needed tostop the interface to apply a new configuration. This could result in akernel panic when doing ...

CVE-2021-47559

In the Linux kernel, the following vulnerability has been resolved: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk() Coverity reports a possible NULL dereferencing problem: in smc_vlan_by_tcpsk():6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).7. var_...

CVE-2021-47560

In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum: Protect driver from buggy firmware When processing port up/down events generated by the device's firmware,the driver protects itself from events reported for non-existent localports, but not the CPU port (local por...