CVE-2022-48969— xen-netfront: Fix NULL sring after live migration
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I. Basic Information for CVE-2022-48969
Vulnerability Information
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Vulnerability Title
xen-netfront: Fix NULL sring after live migration
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xen-netfront: Fix NULL sring after live migration A NAPI is setup for each network sring to poll data to kernel The sring with source host is destroyed before live migration and new sring with target host is setup after live migration. The NAPI for the old sring is not deleted until setup new sring with target host after migration. With busy_poll/busy_read enabled, the NAPI can be polled before got deleted when resume VM. BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 IP: xennet_poll+0xae/0xd20 PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI Call Trace: finish_task_switch+0x71/0x230 timerqueue_del+0x1d/0x40 hrtimer_try_to_cancel+0xb5/0x110 xennet_alloc_rx_buffers+0x2a0/0x2a0 napi_busy_loop+0xdb/0x270 sock_poll+0x87/0x90 do_sys_poll+0x26f/0x580 tracing_map_insert+0x1d4/0x2f0 event_hist_trigger+0x14a/0x260 finish_task_switch+0x71/0x230 __schedule+0x256/0x890 recalc_sigpending+0x1b/0x50 xen_sched_clock+0x15/0x20 __rb_reserve_next+0x12d/0x140 ring_buffer_lock_reserve+0x123/0x3d0 event_triggers_call+0x87/0xb0 trace_event_buffer_commit+0x1c4/0x210 xen_clocksource_get_cycles+0x15/0x20 ktime_get_ts64+0x51/0xf0 SyS_ppoll+0x160/0x1a0 SyS_ppoll+0x160/0x1a0 do_syscall_64+0x73/0x130 entry_SYSCALL_64_after_hwframe+0x41/0xa6 ... RIP: xennet_poll+0xae/0xd20 RSP: ffffb4f041933900 CR2: 0000000000000008 ---[ end trace f8601785b354351c ]--- xen frontend should remove the NAPIs for the old srings before live migration as the bond srings are destroyed There is a tiny window between the srings are set to NULL and the NAPIs are disabled, It is safe as the NAPI threads are still frozen at that time
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在实时迁移后NAPI字符串处理不当导致的空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-48969
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Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total
| CVE-2024-50017 | x86/mm/ident_map: Use gbpages only where full GB page should be mapped. | |
| CVE-2024-50028 | thermal: core: Reference count the zone in thermal_zone_get_by_id() | |
| CVE-2024-50029 | Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync | |
| CVE-2024-50027 | thermal: core: Free tzp copy along with the thermal zone | |
| CVE-2024-50025 | scsi: fnic: Move flush_work initialization out of if block | |
| CVE-2024-50026 | scsi: wd33c93: Don't use stale scsi_pointer value | |
| CVE-2024-50023 | net: phy: Remove LED entry from LEDs list on unregister | |
| CVE-2024-50024 | net: Fix an unsafe loop on the list | |
| CVE-2024-50022 | device-dax: correct pgoff align in dax_set_mapping() | |
| CVE-2024-50021 | ice: Fix improper handling of refcount in ice_dpll_init_rclk_pins() | |
| CVE-2024-50020 | ice: Fix improper handling of refcount in ice_sriov_set_msix_vec_count() | |
| CVE-2024-50019 | kthread: unpark only parked kthread | |
| CVE-2024-50010 | exec: don't WARN for racy path_noexec check | |
| CVE-2024-50005 | mac802154: Fix potential RCU dereference issue in mac802154_scan_worker | |
| CVE-2024-50006 | ext4: fix i_data_sem unlock order in ext4_ind_migrate() | |
| CVE-2024-50007 | ALSA: asihpi: Fix potential OOB array access | |
| CVE-2024-50008 | wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext() | |
| CVE-2024-50009 | cpufreq: amd-pstate: add check for cpufreq_cpu_get's return value | |
| CVE-2024-50013 | exfat: fix memory leak in exfat_load_bitmap() | |
| CVE-2024-50015 | ext4: dax: fix overflowing extents beyond inode size when partially writing |
Showing top 20 of 372 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2022-48969
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