Linux Kernel Security Vulnerabilities

CVE-2021-47486

In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix potential NULL dereference The bpf_jit_binary_free() function requires a non-NULL argument. Whenthe RISC-V BPF JIT fails to converge in NR_JIT_ITERATIONS steps,jit_data->header will be NULL, which triggers a NULL...

CVE-2021-47488

In the Linux kernel, the following vulnerability has been resolved: cgroup: Fix memory leak caused by missing cgroup_bpf_offline When enabling CONFIG_CGROUP_BPF, kmemleak can be observed by runningthe command as below: $mount -t cgroup -o none,name=foo cgroup cgroup/ $umount cgroup/ unreferenced ob...

CVE-2021-47489

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix even more out of bound writes from debugfs CVE-2021-42327 was fixed by: commit f23750b5b3d98653b31d4469592935ef6364ad67Author: Thelford Williams [email protected] Date: Wed Oct 13 16:04:13 2021 -0400 drm/amdgpu...

CVE-2021-47490

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: fix memleak in ttm_transfered_destroy We need to cleanup the fences for ghost objects as well. Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214029Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214447

CVE-2021-47491

In the Linux kernel, the following vulnerability has been resolved: mm: khugepaged: skip huge page collapse for special files The read-only THP for filesystems will collapse THP for files openedreadonly and mapped with VM_EXEC. The intended usecase is to avoid TLBmisses for large text segments. But...

CVE-2021-47492

In the Linux kernel, the following vulnerability has been resolved: mm, thp: bail out early in collapse_file for writeback page Currently collapse_file does not explicitly check PG_writeback, instead,page_has_private and try_to_release_page are used to filter writebackpages. This does not work for ...

CVE-2021-47493

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix race between searching chunks and release journal_head from buffer_head Encountered a race between ocfs2_test_bg_bit_allocatable() andjbd2_journal_put_journal_head() resulting in the below vmcore. PID: 106879 TASK: ffff8...

CVE-2021-47494

In the Linux kernel, the following vulnerability has been resolved: cfg80211: fix management registrations locking The management registrations locking was broken, the list waslocked for each wdev, but cfg80211_mgmt_registrations_update()iterated it without holding all the correct spinlocks, causin...

CVE-2021-47495

In the Linux kernel, the following vulnerability has been resolved: usbnet: sanity check for maxpacket maxpacket of 0 makes no sense and oopses as we need to divideby it. Give up. V2: fixed typo in log and stylistic issues

CVE-2021-47496

In the Linux kernel, the following vulnerability has been resolved: net/tls: Fix flipped sign in tls_err_abort() calls sk->sk_err appears to expect a positive value, a convention that ktlsdoesn't always follow and that leads to memory corruption in other code.For instance, [kworker] tls_encrypt_...

CVE-2021-47497

In the Linux kernel, the following vulnerability has been resolved: nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells If a cell has 'nbits' equal to a multiple of BITS_PER_BYTE the logic *p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0); will become undefined behavior because nbits modu...

CVE-2021-47498

In the Linux kernel, the following vulnerability has been resolved: dm rq: don't queue request to blk-mq during DM suspend DM uses blk-mq's quiesce/unquiesce to stop/start device mapper queue. But blk-mq's unquiesce may come from outside events, such as elevatorswitch, updating nr_requests or other...

CVE-2021-47499

In the Linux kernel, the following vulnerability has been resolved: iio: accel: kxcjk-1013: Fix possible memory leak in probe and remove When ACPI type is ACPI_SMO8500, the data->dready_trig will not be set, thememory allocated by iio_triggered_buffer_setup() will not be freed, and causememory l...

CVE-2021-47500

In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. TheIIO core when done using this trigger will call iio_trigger_put() to dropthe reference count by 1. Without the matc...

CVE-2021-47501

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix NULL pointer dereference in i40e_dbg_dump_desc When trying to dump VFs VSI RX/TX descriptorsusing debugfs there was a crashdue to NULL pointer dereference in i40e_dbg_dump_desc.Added a check to i40e_dbg_dump_desc that che...

CVE-2021-47502

In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: wcd934x: handle channel mappping list correctly Currently each channel is added as list to dai channel list, howeverthere is danger of adding same channel to multiple dai channel listwhich endups corrupting the other ...

CVE-2021-47503

In the Linux kernel, the following vulnerability has been resolved: scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc() Calling scsi_remove_host() before scsi_add_host() results in a crash: BUG: kernel NULL pointer dereference, address: 0000000000000108RIP: 0010:device_del+0x63/0x440Call...

CVE-2021-47504

In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure task_work gets run as part of cancelations If we successfully cancel a work item but that work item needs to beprocessed through task_work, then we can be sleeping uninterruptiblyin io_uring_cancel_generic() and ne...

CVE-2021-47505

In the Linux kernel, the following vulnerability has been resolved: aio: fix use-after-free due to missing POLLFREE handling signalfd_poll() and binder_poll() are special in that they use awaitqueue whose lifetime is the current task, rather than the structfile as is normally the case. This is okay...

CVE-2021-47506

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. Adelegation break runs a callback which immediately (innfsd4_cb_recall_prepare) adds the delegation to del_recall...

CVE-2021-47507

In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix nsfd startup race (again) Commit bd5ae9288d64 ("nfsd: register pernet ops last, unregister first")has re-opened rpc_pipefs_event() race against nfsd_net_id registration(register_pernet_subsys()) which has been fixed by co...

CVE-2021-47508

In the Linux kernel, the following vulnerability has been resolved: btrfs: free exchange changeset on failures Fstests runs on my VMs have show several kmemleak reports like the following. unreferenced object 0xffff88811ae59080 (size 64):comm "xfs_io", pid 12124, jiffies 4294987392 (age 6.368s)hex ...

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...