{"id":"CVE-2021-30178","aliases":["AZL-6556","BELL-CVE-2021-30178","CLSA-2024-1720468480","EUVD-2021-17114","GHSA-5qhm-686w-6256","UBUNTU-CVE-2021-30178"],"status":"published","title":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c...","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00299,"percentile":0.22883,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2021-04-06T23:29:00Z","modified":"2026-10-26T09:31:41Z","fixes":[{"ecosystem":"Azure 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-1679","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21499","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-25265","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-26365","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-28390","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-33740","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-33741","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3424","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3565","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3566","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3629","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-4095","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-41858","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-42719","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-45934","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48947","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49956","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50067","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50179","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1077","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1118","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1380","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1513","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1829","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1838","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1989","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-2124","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3111","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3141","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3268","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3567","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-35824","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-39197","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40283","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-42753","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4387","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4623","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51042","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51043","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51780","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52435","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52445","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52752","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52973","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53145","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53213","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53333","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6270","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6606","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6610","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6931","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6932","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-0584","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26898","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-30178","tags":["report"]},{"url":"https://git.kernel.org/linus/919f4ebc598701670e80e31573a58f1f2d2bf918","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-30178","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-30178","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2021-04-06T23:29:00Z","modified":"2024-08-03T22:24:59.677Z","updated_at":"2026-11-02T14:33:02.20241Z"}],"euvd":[{"id":"EUVD-2021-17114","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2021-04-06T23:29:00Z","modified":"2024-08-03T22:24:59Z","updated_at":"2026-11-03T03:24:42.963555Z"}],"ghsa":[{"id":"GHSA-5qhm-686w-6256","title":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c...","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2022-05-24T17:46:49Z","modified":"2023-01-29T05:07:08Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:09.170985Z"}],"nvd":[{"id":"CVE-2021-30178","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2021-04-07T00:15:13.367Z","modified":"2026-06-17T03:49:49.23Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:51.610648Z"}],"osv":[{"id":"AZL-6556","title":"CVE-2021-30178 affecting package kernel for versions less than 5.10.78.1-1","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2021-04-07T00:15:13Z","modified":"2026-04-21T04:37:38.149617Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"BELL-CVE-2021-30178","title":"CVE-2021-30178 does not affect BellSoft software","status":"withdrawn","published":"2021-04-07T00:15:00Z","modified":"2026-01-26T09:49:57.489025Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"UBUNTU-CVE-2021-30178","description":"An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987.","status":"published","published":"2021-04-07T00:15:00Z","modified":"2025-10-24T04:50:17Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:27.332852Z"},{"id":"CLSA-2024-1720468480","title":"kernel: Fix of 101 CVEs","description":"- kvm: initialize all of the kvm_debugregs structure before sending it to userspace {CVE-2023-1513}\n- wifi: mac80211: fix MBSSID parsing use-after-free {CVE-2022-42719}\n- mac80211: always allocate struct ieee802_11_elems {CVE-2022-42719}\n- netfilter: nf_tables: initialize registers in nft_do_chain() {CVE-2022-1016}\n- xprtrdma: fix incorrect header size calculations {CVE-2022-0812}\n- net: usb: fix memory leak in smsc75xx_bind {CVE-2021-47171}\n- i2c: i801: Don't generate an interrupt on bus reset {CVE-2021-47153}\n- pid: take a reference when initializing `cad_pid` {CVE-2021-47118}\n- Input: appletouch - initialize work before device registration {CVE-2021-46932}\n- HID: usbhid: fix info leak in hid_submit_ctrl {CVE-2021-46906}\n- quota: check block number when reading the block in quota file {CVE-2021-45868}\n- mwifiex: Fix skb_over_panic in mwifiex_usb_recv() {CVE-2021-43976}\n- atlantic: Fix OOB read and write in hw_atl_utils_fw_rpc_wait {CVE-2021-43975}\n- isdn: cpai: check ctr-\u003ecnr to avoid array index out of bound {CVE-2021-43389}\n- usb: hso: fix error handling code of hso_create_net_device {CVE-2021-37159}\n- can: bcm: fix infoleak in struct bcm_msg_head {CVE-2021-34693}\n- dm ioctl: fix out of bounds array access when no devices {CVE-2021-31916}\n- KVM: x86: hyper-v: Fix Hyper-V context null-ptr-deref {CVE-2021-30178}\n- perf/x86/intel: Fix a crash caused by zero PEBS status {CVE-2021-28971}\n- btrfs: fix race when cloning extent buffer during rewind of an old root {CVE-2021-28964}\n- ovl: fix missing negative dentry check in ovl_rename() {CVE-2021-20321}\n- drm/ttm/nouveau: don't call tt destroy callback on alloc failure. {CVE-2021-20292}\n- bpf: Verifer, adjust_scalar_min_max_vals to always call update_reg_bounds() {CVE-2021-4159}\n- btrfs: unlock newly allocated extent buffer after error {CVE-2021-4149}\n- tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop. {CVE-2021-3679}\n- net: mac802154: Fix general protection fault {CVE-2021-3659}\n- nfsd4: readdirplus shouldn't return parent of export {CVE-2021-3178}\n- Bluetooth: SMP: Fail if remote and local public keys are identical {CVE-2021-0129}\n- drm/nouveau: clean up all clients on device removal {CVE-2020-27820}\n- drm/nouveau: Add a dedicated mutex for the clients list {CVE-2020-27820}\n- drm/nouveau: use drm_dev_unplug() during device removal {CVE-2020-27820}\n- Bluetooth: SMP: Fail if remote and local public keys are identical {CVE-2020-26555}\n- vsock: Fix memory leak in vsock_connect() {CVE-2022-3629}\n- RDMA/core: Don't infoleak GRH fields {CVE-2021-3923}\n- xen/netfront: force data bouncing when backend is untrusted {CVE-2022-33741}\n- net: Rename and export copy_skb_header\n- floppy: use a statically allocated error counter {CVE-2022-1652}\n- fuse: fix pipe buffer lifetime for direct_io {CVE-2022-1011}\n- aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts {CVE-2024-26898}\n- smb: client: fix use-after-free bug in cifs_debug_data_proc_show() {CVE-2023-52752}\n- media: pvrusb2: fix use after free on context disconnection {CVE-2023-52445}\n- media: dm1105: Fix use after free bug in dm1105_remove due to race condition {CVE-2023-35824}\n- perf: Fix perf_event_validate_size() lockdep splat {CVE-2023-6931}\n- perf: Fix perf_event_validate_size() {CVE-2023-6931}\n- net/sched: sch_hfsc: Ensure inner classes have fsc curve {CVE-2023-4623}\n- relayfs: fix out-of-bounds access in relay_file_read {CVE-2023-3268}\n- xfs: verify buffer contents when we skip log replay {CVE-2023-2124}\n- Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race condition {CVE-2023-1989}\n- Fix double fget() in vhost_net_set_backend() {CVE-2023-1838}\n- net/sched: cls_tcindex: downgrade to imperfect hash {CVE-2023-1829}\n- xen/netfront: fix leaking data in shared pages {CVE-2022-33740}\n- can: ems_usb: ems_usb_start_xmit(): fix double dev_kfree_skb() in error path {CVE-2022-28390}\n- xen/blkfront: fix leaking data in shared pages {CVE-2022-26365}\n- mISDN: fix use-after-free bugs in l1oip timer handlers {CVE-2022-3565}\n- drm/vgem: Close use-after-free race in vgem_gem_create {CVE-2022-1419}\n- cfg80211: call cfg80211_stop_ap when switch from P2P_GO type {CVE-2021-47194}\n- net: fix use-after-free in tw_timer_handler {CVE-2021-46936}\n- ext4: fix race writing to an inline_data file while its xattrs are changing {CVE-2021-40490}\n- virtio_console: Assure used length from device is limited {CVE-2021-38160}\n- pNFS/flexfiles: fix incorrect size check in decode_nfs_fh() {CVE-2021-4157}\n- Bluetooth: sco: Fix lock_sock() blockage by memcpy_from_msg() {CVE-2021-3640}\n- Input: joydev - prevent use of not validated data in JSIOCSBTNMAP ioctl {CVE-2021-3612}\n- Input: joydev - prevent potential read overflow in ioctl {CVE-2021-3612}\n- can: bcm: delay release of struct bcm_op after synchronize_rcu() {CVE-2021-3609}\n- vt: keyboard: avoid signed integer overflow in k_ascii {CVE-2020-13974}\n- i2c: Fix a potential use after free {CVE-2019-25162}\n- drivers: net: slip: fix NPD bug in sl_tx_timeout() {CVE-2022-41858}\n- Bluetooth: L2CAP: Fix u8 overflow {CVE-2022-45934}\n- btrfs: unset reloc control if transaction commit fails in prepare_to_relocate() {CVE-2023-3111}\n- memstick: r592: Fix UAF bug in r592_remove due to race condition {CVE-2023-3141}\n- media: rc: Fix use-after-free bugs caused by ene_tx_irqsim() {CVE-2023-1118}\n- vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF {CVE-2023-3567}\n- Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb {CVE-2023-40283}\n- wifi: brcmfmac: slab-out-of-bounds read in brcmf_get_assoc_ies() {CVE-2023-1380}\n- tcp: Fix data races around icsk-\u003eicsk_af_ops. {CVE-2022-3566}\n- staging: rtl8712: fix use after free bugs {CVE-2022-4095}\n- ext4: fix kernel infoleak via ext4_extent_header {CVE-2022-0850}\n- af_key: add __GFP_ZERO flag for compose_sadb_supported in function pfkey_register {CVE-2022-1353}\n- misc: sgi-gru: fix use-after-free error in gru_set_context_option, gru_fault and gru_handle_user_call_os {CVE-2022-3424}\n- x86/elf: Disable automatic READ_IMPLIES_EXEC on 64-bit {CVE-2022-25265}\n- x86/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK {CVE-2022-25265}\n- x86/elf: Add table to document READ_IMPLIES_EXEC {CVE-2022-25265}\n- ipv6: use prandom_u32() for ID generation {CVE-2021-45485}\n- bpf: Fix integer overflow in prealloc_elems_and_freelist() {CVE-2021-41864}\n- ipv4: make exception cache less predictible {CVE-2021-20322}\n- ipv4: use siphash instead of Jenkins in fnhe_hashfun() {CVE-2021-20322}\n- net: vmxnet3: fix possible use-after-free bugs in vmxnet3_rq_alloc_rx_buf() {CVE-2023-4387}\n- netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one {CVE-2023-39197}\n- ipv4: igmp: fix refcnt uaf issue when receiving igmp query packet {CVE-2023-6932}\n- smb: client: fix potential OOB in smb2_dump_detail() {CVE-2023-6610}\n- smb: client: fix OOB in smbCalcSize() {CVE-2023-6606}\n- atm: Fix Use-After-Free in do_vcc_ioctl {CVE-2023-51780}\n- drm/amdgpu: Fix potential fence use-after-free v2 {CVE-2023-51042}\n- sched/rt: pick_next_rt_entity(): check list_entry {CVE-2023-1077}\n- ath9k: fix use-after-free in ath9k_hif_usb_rx_cb {CVE-2022-1679}\n- net: prevent mss overflow in skb_segment() {CVE-2023-52435}\n- drm/atomic: Fix potential use-after-free in nonblocking commits {CVE-2023-42753}\n- debug: Lock down kgdb {CVE-2022-21499}","status":"published","published":"2026-10-19T12:59:28Z","modified":"2026-10-26T09:31:41.204436808Z","updated_at":"2026-11-02T15:43:40.88185Z"}]}}