CVE-2026-53199High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf netvsc_copy_to_send_buf() copies page buffer entries into the VMBus send buffer using phys_to_virt() on the e…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.5%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf
netvsc_copy_to_send_buf() copies page buffer entries into the VMBus send buffer using phys_to_virt() on the entry PFN. Entries for the RNDIS header and the skb linear data come from kmalloc'd memory and are always in the kernel direct map, but entries for skb fragments reference page cache or user pages, which on 32-bit x86 with CONFIG_HIGHMEM=y can live above the LOWMEM boundary. For such a page phys_to_virt() returns an address outside the direct map and the subsequent memcpy() faults on the transmit softirq path, which is fatal.
Map the pages with kmap_local_page() instead, handling two properties of the page buffer entries:
pb[i].pfn is a Hyper-V PFN at HV_HYP_PAGE_SIZE (4K) granularity, not a native PFN. Reconstruct the physical address first and derive the native page from it, so the mapping stays correct where PAGE_SIZE > HV_HYP_PAGE_SIZE (e.g. arm64 with 64K pages).
Since commit 41a6328b2c55 ("hv_netvsc: Preserve contiguous PFN grouping in the page buffer array"), an entry describes a full physically contiguous fragment and pb[i].len can exceed PAGE_SIZE, while kmap_local_page() maps a single page. Copy page by page, splitting at native page boundaries.
The copy path only handles packets smaller than the send section size (6144 bytes by default); larger packets take the cp_partial path where only the RNDIS header is copied. So entries here are bounded by the section size and a copy is split at most once on 4K-page systems. On !CONFIG_HIGHMEM configs kmap_local_page() folds to page_address() and no mapping work is added.
Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 16514afeb7d3d121072ba9a0b640d6c1c5507db0Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < a82d4251918f37d9c5aab7b365157669fb885ec3Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 695c59cf7bf707e6ff8cea01916ee50e86616933Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 09b8a7aa5a341bb345dc492aac139525efa13515Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 918c0c988239aa5ab96b254e504d191af6191061Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 0b38870d81ab3a04c1ab0598d9d3285f5d9d0584Linux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < fe7221b4346418d27ec2daccfc09df6692b76f0bLinux >= c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e < 004e9ecfe6c5384f9e0b2f6f6389d42ec22789afLinux 3.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2024-38564High· 7.8bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
CVE-2026-99092Noneriscv: patch: fix handling of bpf-jit execmem addresses
CVE-2026-99089NoneASoC: samsung: i2s: enable op_clk in probe to balance runtime PM
CVE-2026-99093Nonemm: don't schedule deferred kernel page table freeing while booting
CVE-2026-99088Nonenet: openvswitch: validate transport header presence in set_ipv6_addr
CVE-2026-99090Nonedrm/amdgpu: serialize vblank counter reads against GPU reset