virtio-net: fix len check in receive_big()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.178, 6.6.145, 6.12.97, 6.18, 6.18.40, and 1 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 82f9028e83944a9eee5229cbc6fee9be1de8a62d · fixed in f9451d0fd5ba635dcabb49bfe456a6db734a8986; From 946dec89c41726b94d31147ec528b96af0be1b5a · fixed in 38e94d63e29f4a5c6eae87ee2c02101aaa321502; From 82fe78065450d2d07f36a22e2b6b44955cf5ca5b · fixed in fbeb65154583879d556ea94cb2f15888e9470f3d; From 0c716703965ffc5ef4311b65cb5d84a703784717 · fixed in c7fc9adf4e006155f7f2aeda052fbcde25cdcc49; From 0c716703965ffc5ef4311b65cb5d84a703784717 · fixed in e6b8463b7d791f3886d7584259d6e9f06a69f12e; From 0c716703965ffc5ef4311b65cb5d84a703784717 · fixed in 9e5ad06ea826322ce8c58b4a68442a96f600c3c4; From 6.1.159 · fixed in 6.1.178; From 6.6.117 · fixed in 6.6.145; From 6.12.58 · fixed in 6.12.97; From 6.17.8 · fixed in 6.18
- Linux Linux
6.18
- KernelLinux
fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.18.0 · fixed in 7.1.5