CVE-2026-23215— x86/vmware: Fix hypercall clobbers
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I. Basic Information for CVE-2026-23215
Vulnerability Information
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Vulnerability Title
x86/vmware: Fix hypercall clobbers
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/vmware: Fix hypercall clobbers Fedora QA reported the following panic: BUG: unable to handle page fault for address: 0000000040003e54 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20251119-3.fc43 11/19/2025 RIP: 0010:vmware_hypercall4.constprop.0+0x52/0x90 .. Call Trace: vmmouse_report_events+0x13e/0x1b0 psmouse_handle_byte+0x15/0x60 ps2_interrupt+0x8a/0xd0 ... because the QEMU VMware mouse emulation is buggy, and clears the top 32 bits of %rdi that the kernel kept a pointer in. The QEMU vmmouse driver saves and restores the register state in a "uint32_t data[6];" and as a result restores the state with the high bits all cleared. RDI originally contained the value of a valid kernel stack address (0xff5eeb3240003e54). After the vmware hypercall it now contains 0x40003e54, and we get a page fault as a result when it is dereferenced. The proper fix would be in QEMU, but this works around the issue in the kernel to keep old setups working, when old kernels had not happened to keep any state in %rdi over the hypercall. In theory this same issue exists for all the hypercalls in the vmmouse driver; in practice it has only been seen with vmware_hypercall3() and vmware_hypercall4(). For now, just mark RDI/RSI as clobbered for those two calls. This should have a minimal effect on code generation overall as it should be rare for the compiler to want to make RDI/RSI live across hypercalls.
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hypercall破坏寄存器状态，可能导致页面错误。
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-2026-23215
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Same Patch Batch · Linux · 2026-02-18 · 31 CVEs total
| CVE-2026-23230 | 8.8 HIGH | smb: client: split cached_fid bitfields to avoid shared-byte RMW races |
| CVE-2026-23226 | 8.8 HIGH | ksmbd: add chann_lock to protect ksmbd_chann_list xarray |
| CVE-2026-23227 | 7.8 HIGH | drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to |
| CVE-2026-23225 | 7.8 HIGH | sched/mmcid: Don't assume CID is CPU owned on mode switch |
| CVE-2026-23224 | 7.8 HIGH | erofs: fix UAF issue for file-backed mounts w/ directio option |
| CVE-2026-23222 | 7.8 HIGH | crypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly |
| CVE-2025-71234 | wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add | |
| CVE-2026-23229 | crypto: virtio - Add spinlock protection with virtqueue notification | |
| CVE-2026-23228 | smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection() | |
| CVE-2026-23223 | xfs: fix UAF in xchk_btree_check_block_owner | |
| CVE-2026-23221 | bus: fsl-mc: fix use-after-free in driver_override_show() | |
| CVE-2026-23220 | ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths | |
| CVE-2025-71237 | nilfs2: Fix potential block overflow that cause system hang | |
| CVE-2025-71236 | scsi: qla2xxx: Validate sp before freeing associated memory | |
| CVE-2025-71235 | scsi: qla2xxx: Delay module unload while fabric scan in progress | |
| CVE-2026-23211 | mm, swap: restore swap_space attr aviod kernel panic | |
| CVE-2025-71233 | PCI: endpoint: Avoid creating sub-groups asynchronously | |
| CVE-2025-71232 | scsi: qla2xxx: Free sp in error path to fix system crash | |
| CVE-2025-71231 | crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode | |
| CVE-2025-71230 | hfs: ensure sb->s_fs_info is always cleaned up |
Showing top 20 of 31 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-2026-23215
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