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CVE-2026-64552— virtio-net: fix len check in receive_big()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.1.159至6.1.178之前版本、6.6.117至6.6.145之前版本、6.12.58至6.12.97之前版本、6.17.8至6.18之前版本和6.18版本存在安全漏洞，该漏洞源于receive_big()函数中设备声明的长度边界检查宽松，可能导致发起越界写入攻击。

CVSS 8.4 · High EPSS 0.14% · P3

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux 82f9028e83944a9eee5229cbc6fee9be1de8a62d< f9451d0fd5ba635dcabb49bfe456a6db734a8986 affected
946dec89c41726b94d31147ec528b96af0be1b5a< 38e94d63e29f4a5c6eae87ee2c02101aaa321502 affected
82fe78065450d2d07f36a22e2b6b44955cf5ca5b< fbeb65154583879d556ea94cb2f15888e9470f3d affected
0c716703965ffc5ef4311b65cb5d84a703784717< c7fc9adf4e006155f7f2aeda052fbcde25cdcc49 affected
0c716703965ffc5ef4311b65cb5d84a703784717< e6b8463b7d791f3886d7584259d6e9f06a69f12e affected
0c716703965ffc5ef4311b65cb5d84a703784717< 9e5ad06ea826322ce8c58b4a68442a96f600c3c4 affected
3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 affected
6.1.159< 6.1.178 affected
… +11 more rows
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I. Basic Information for CVE-2026-64552

Vulnerability Information
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Vulnerability Title
virtio-net: fix len check in receive_big()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.1.159至6.1.178之前版本、6.6.117至6.6.145之前版本、6.12.58至6.12.97之前版本、6.17.8至6.18之前版本和6.18版本存在安全漏洞，该漏洞源于receive_big()函数中设备声明的长度边界检查宽松，可能导致发起越界写入攻击。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 82f9028e83944a9eee5229cbc6fee9be1de8a62d ~ f9451d0fd5ba635dcabb49bfe456a6db734a8986 -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-64552

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III. Intelligence Information for CVE-2026-64552

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Patches & Fixes for CVE-2026-64552 (5)

Same Patch Batch · Linux · 2026-07-27 · 26 CVEs total

CVE-2026-64534 9.8 CRITICAL nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64535 9.8 CRITICAL nvmet-tcp: Fix potential UAF when ddgst mismatch
CVE-2026-64541 9.8 CRITICAL net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
CVE-2026-64551 9.1 CRITICAL sctp: validate STALE_COOKIE cause length before reading staleness
CVE-2026-64555 8.8 HIGH KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
CVE-2026-64554 8.8 HIGH netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
CVE-2026-64548 8.4 HIGH bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
CVE-2026-64536 8.1 HIGH staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop
CVE-2026-64547 8.1 HIGH net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
CVE-2026-64540 8.1 HIGH usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
CVE-2026-64532 7.8 HIGH fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
CVE-2026-64543 7.8 HIGH tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
CVE-2026-64539 7.8 HIGH Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
CVE-2026-17523 7.8 HIGH can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
CVE-2026-64533 7.8 HIGH fs/ntfs3: validate lcns_follow in log_replay conversion
CVE-2026-64531 7.8 HIGH net: openvswitch: reject oversized nested action attrs
CVE-2026-64545 7.5 HIGH net, bpf: check master for NULL in xdp_master_redirect()
CVE-2026-64550 7.3 HIGH net: qualcomm: rmnet: validate MAP frame length before ingress parsing
CVE-2026-64546 7.1 HIGH drm/edid: fix OOB read in drm_parse_tiled_block()
CVE-2026-64542 ipv6: ndisc: fix NULL deref in accept_untracked_na()

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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