Linux Kernel Security Vulnerabilities

CVE-2021-47304

In the Linux kernel, the following vulnerability has been resolved: tcp: fix tcp_init_transfer() to not reset icsk_ca_initialized This commit fixes a bug (found by syzkaller) that could cause spuriousdouble-initializations for congestion control modules, which could causememory leaks or other probl...

CVE-2021-47305

In the Linux kernel, the following vulnerability has been resolved: dma-buf/sync_file: Don't leak fences on merge failure Each add_fence() call does a dma_fence_get() on the relevant fence. Inthe error path, we weren't calling dma_fence_put() so all those fencesgot leaked. Also, in the krealloc_arr...

CVE-2021-47306

In the Linux kernel, the following vulnerability has been resolved: net: fddi: fix UAF in fza_probe fp is netdev private data and it cannot beused after free_netdev() call. Using fp after free_netdev()can cause UAF bug. Fix it by moving free_netdev() after error message. TURBOchannel adapter")

CVE-2021-47307

In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL deref in cifs_compose_mount_options() The optional @ref parameter might contain an NULL node_name, soprevent dereferencing it in cifs_compose_mount_options(). Addresses-Coverity: 1476408 ("Explicit null dereferen...

CVE-2021-47308

In the Linux kernel, the following vulnerability has been resolved: scsi: libfc: Fix array index out of bound exception Fix array index out of bound exception in fc_rport_prli_resp().

CVE-2021-47309

In the Linux kernel, the following vulnerability has been resolved: net: validate lwtstate->data before returning from skb_tunnel_info() skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_infotype without validation. lwtstate->data can have various types such asmpls_iptunnel_...

CVE-2021-47310

In the Linux kernel, the following vulnerability has been resolved: net: ti: fix UAF in tlan_remove_one priv is netdev private data and it cannot beused after free_netdev() call. Using priv after free_netdev()can cause UAF bug. Fix it by moving free_netdev() at the end of thefunction.

CVE-2021-47311

In the Linux kernel, the following vulnerability has been resolved: net: qcom/emac: fix UAF in emac_remove adpt is netdev private data and it cannot beused after free_netdev() call. Using adpt after free_netdev()can cause UAF bug. Fix it by moving free_netdev() at the end of thefunction.

CVE-2021-47312

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix dereference of null pointer flow In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false thennft_flow_rule_create is not called and flow is NULL. The subsequenterror handling execution via label ...

CVE-2021-47313

In the Linux kernel, the following vulnerability has been resolved: cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init It's a classic example of memleak, we allocate something, we fail andnever free the resources. Make sure we free all resources on policy ->init() failures.

CVE-2021-47314

In the Linux kernel, the following vulnerability has been resolved: memory: fsl_ifc: fix leak of private memory on probe failure On probe error the driver should free the memory allocated for privatestructure. Fix this by using resource-managed allocation.

CVE-2021-47315

In the Linux kernel, the following vulnerability has been resolved: memory: fsl_ifc: fix leak of IO mapping on probe failure On probe error the driver should unmap the IO memory. Smatch reports: drivers/memory/fsl_ifc.c:298 fsl_ifc_ctrl_probe() warn: 'fsl_ifc_ctrl_dev->gregs' not released on lin...

CVE-2021-47316

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in nfs3svc_encode_getaclres In error cases the dentry may be NULL. Before 20798dfe249a, the encoder also checked dentry andd_really_is_positive(dentry), but that looks like overkill to me--zerostatus shou...

CVE-2021-47317

In the Linux kernel, the following vulnerability has been resolved: powerpc/bpf: Fix detecting BPF atomic instructions Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode otheratomics in .imm") converted BPF_XADD to BPF_ATOMIC and added a way todistinguish instructions based on the i...

CVE-2021-47318

In the Linux kernel, the following vulnerability has been resolved: arch_topology: Avoid use-after-free for scale_freq_data Currently topology_scale_freq_tick() (which gets called fromscheduler_tick()) may end up using a pointer to "structscale_freq_data", which was previously cleared bytopology_cl...

CVE-2021-47319

In the Linux kernel, the following vulnerability has been resolved: virtio-blk: Fix memory leak among suspend/resume procedure The vblk->vqs should be freed before we call init_vqs()in virtblk_restore().

CVE-2021-47320

In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posix_acl_create() When looking into another nfs xfstests report, I found acl anddefault_acl in nfs3_proc_create() and nfs3_proc_mknod() errorpaths are possibly leaked. Fix them in advance.

CVE-2021-47321

In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() 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 runn...

CVE-2021-47322

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT Fix an Oopsable condition in pnfs_mark_request_commit() when we'reputting a set of writes on the commit list to reschedule them after afailed pNFS attempt.

CVE-2021-47323

In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's remove path calls del_timer(). However, that functiondoes not wait until the timer handler finishes. This means that thetimer handler may still be runn...

CVE-2021-47324

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

CVE-2021-47325

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation The reference counting issue happens in several exception handling pathsof arm_smmu_iova_to_phys_hard(). When those error scenarios occur, thefunction forgets...

CVE-2021-47327

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases therefcount of the "smmu" even though the return value is less than 0. The reference co...

CVE-2021-47328

In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix conn use after free during resets If we haven't done a unbind target call we can race whereiscsi_conn_teardown wakes up the EH thread and then frees the conn whilethose threads are still accessing the conn ehwait. ...

CVE-2021-47329

In the Linux kernel, the following vulnerability has been resolved: scsi: megaraid_sas: Fix resource leak in case of probe failure The driver doesn't clean up all the allocated resources properly whenscsi_add_host(), megasas_start_aen() function fails during the PCI deviceprobe. Clean up all those ...

CVE-2021-47330

In the Linux kernel, the following vulnerability has been resolved: tty: serial: 8250: serial_cs: Fix a memory leak in error handling path In the probe function, if the final 'serial_config()' fails, 'info' isleaking. Add a resource handling path to free this memory.

CVE-2021-47331

In the Linux kernel, the following vulnerability has been resolved: usb: common: usb-conn-gpio: fix NULL pointer dereference of charger When power on system with OTG cable, IDDIG's interrupt arises beforethe charger registration, it will cause a NULL pointer dereference,fix the issue by registering...

CVE-2021-47332

In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: Don't call free_pages_exact() with NULL address Unlike some other functions, we can't pass NULL pointer tofree_pages_exact(). Add a proper NULL check for avoiding possibleOops.

CVE-2021-47333

In the Linux kernel, the following vulnerability has been resolved: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge There is an issue with the ASPM(optional) capability checking function.A device might be attached to root complex directly, in this case,bus->self(bridge) will be N...

CVE-2021-47334

In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev areallocated by input_allocate_device(), and as...

CVE-2021-47335

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances As syzbot reported, there is an use-after-free issue during f2fs recovery: Use-after-free write at 0xffff88823bc16040 (in kfence-#10):kmem_cache_destroy+0x...

CVE-2021-47336

In the Linux kernel, the following vulnerability has been resolved: smackfs: restrict bytes count in smk_set_cipso() Oops, I failed to update subject line. From 07571157c91b98ce1a4aa70967531e64b78e8346 Mon Sep 17 00:00:00 2001Date: Mon, 12 Apr 2021 22:25:06 +0900Subject: [PATCH] smackfs: restrict b...

CVE-2021-47337

In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix bad pointer dereference when ehandler kthread is invalid Commit 66a834d09293 ("scsi: core: Fix error handling of scsi_host_alloc()")changed the allocation logic to call put_device() to perform host cleanupwith the a...

CVE-2021-47338

In the Linux kernel, the following vulnerability has been resolved: fbmem: Do not delete the mode that is still in use The execution of fb_delete_videomode() is not based on the result of theprevious fbcon_mode_deleted(). As a result, the mode is directly deleted,regardless of whether it is still i...

CVE-2021-47339

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctlimplementation can lead to uninitialized kernel stack data getting usedas input for driver ioctl handlers. The...

CVE-2021-47340

In the Linux kernel, the following vulnerability has been resolved: jfs: fix GPF in diFree Avoid passing inode withJFS_SBI(inode->i_sb)->ipimap == NULL todiFree()[1]. GFP will appear: struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; struct inomap *imap = JFS_IP(ipimap)->i_imap; JFS_...

CVE-2021-47341

In the Linux kernel, the following vulnerability has been resolved: KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio BUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x7c/0x1ec arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:183Read of size 8 at add...

CVE-2021-47342

In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible UAF when remounting r/o a mmp-protected file system After commit 618f003199c6 ("ext4: fix memory leak inext4_fill_super"), after the file system is remounted read-only, thereis a race where the kmmpd thread can e...

CVE-2021-47343

In the Linux kernel, the following vulnerability has been resolved: dm btree remove: assign new_root only when removal succeeds remove_raw() in dm_btree_remove() may fail due to IO read error(e.g. read the content of origin block fails during shadowing),and the value of shadow_spine::root is uninit...

CVE-2021-47344

In the Linux kernel, the following vulnerability has been resolved: media: zr364xx: fix memory leak in zr364xx_start_readpipe syzbot reported memory leak in zr364xx driver.The problem was in non-freed urb in case ofusb_submit_urb() fail. backtrace:[<ffffffff82baedf6>] kmalloc include/linux/sl...

CVE-2021-47345

In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Fix rdma_resolve_route() memory leak Fix a memory leak when "mda_resolve_route() is called more than once onthe same "rdma_cm_id". This is possible if cma_query_handler() triggers theRDMA_CM_EVENT_ROUTE_ERROR flow which p...

CVE-2021-47346

In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer() commit 6f755e85c332 ("coresight: Add helper for inserting synchronizationpackets") removed trailing '\0' from barrier_pkt array and updated thecall sites like ...

CVE-2021-47347

In the Linux kernel, the following vulnerability has been resolved: wl1251: Fix possible buffer overflow in wl1251_cmd_scan Function wl1251_cmd_scan calls memcpy without checking the length.Harden by checking the length is within the maximum allowed size.

CVE-2021-47348

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid HDCP over-read and corruption Instead of reading the desired 5 bytes of the actual target field,the code was reading 8. This could result in a corrupted value if thetrailing 3 bytes were non-zero, so instead ...

CVE-2021-47349

In the Linux kernel, the following vulnerability has been resolved: mwifiex: bring down link before deleting interface We can deadlock when rmmod'ing the driver or going through firmwarereset, because the cfg80211_unregister_wdev() has to bring down the linkfor us, ... which then grab the same wiph...

CVE-2021-47350

In the Linux kernel, the following vulnerability has been resolved: powerpc/mm: Fix lockup on kernel exec fault The powerpc kernel is not prepared to handle exec faults from kernel.Especially, the function is_exec_fault() will return 'false' when anexec fault is taken by kernel, because the check i...

CVE-2021-47351

In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix races between xattr_{set|get} and listxattr operations UBIFS may occur some problems with concurrent xattr_{set|get} andlistxattr operations, such as assertion failure, memory corruption,stale xattr value[1]. Fix it by i...

CVE-2021-47352

In the Linux kernel, the following vulnerability has been resolved: virtio-net: Add validation for used length This adds validation for used length (might comefrom an untrusted device) to avoid data corruptionor loss.

CVE-2021-47353

In the Linux kernel, the following vulnerability has been resolved: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returnedby udf_tgetblk. The function udf_tgetblk is defined in udf/misc.cand returns the value of sb_getblk funct...

CVE-2021-47354

In the Linux kernel, the following vulnerability has been resolved: drm/sched: Avoid data corruptions Wait for all dependencies of a job to complete beforekilling it to avoid data corruptions.