CVE-2026-64552virtio-net: fix len check in receive_big()
Updated under an hour ago ()
Does this affect you?
It affects Linux and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix len check in receive_big() receive_big() bounds the device-announced length by (big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose: add_recvbuf_big() sets sg[1] to start at offset sizeof(struct padded_vnet_hdr) into the first page, so the chain actually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) + big_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the check allows for the common hdr_len == 12 case. A malicious virtio backend can announce a len in that gap. page_to_skb() then walks one frag past the page chain, storing a NULL page->private into skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds write past the static frag array and a NULL frag handed up the rx path. Bound len by the size add_recvbuf_big() actually advertised.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 82f9028e83944a9eee5229cbc6fee9be1de8a62d before f9451d0fd5ba635dcabb49bfe456a6db734a8986; 946dec89c41726b94d31147ec528b96af0be1b5a builds before 38e94d63e29f4a5c6eae87ee2c02101aaa321502; from 82fe78065450d2d07f36a22e2b6b44955cf5ca5b before fbeb65154583879d556ea94cb2f15888e9470f3d; from 0c716703965ffc5ef4311b65cb5d84a703784717 before c7fc9adf4e006155f7f2aeda052fbcde25cdcc49; from 0c716703965ffc5ef4311b65cb5d84a703784717 before e6b8463b7d791f3886d7584259d6e9f06a69f12e; from 0c716703965ffc5ef4311b65cb5d84a703784717 before 9e5ad06ea826322ce8c58b4a68442a96f600c3c4; 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2; from 6.1.159 before 6.1.178; and 3 more ranges | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
References
- https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986
- https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502
- https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d
- https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49
- https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e
- https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.