inet: frags: strip GSO state from fragments before reassembly
In the Linux kernel, the following vulnerability has been resolved: inet: frags: strip GSO state from fragments before reassembly A virtio_net_hdr (tun/tap, or AF_PACKET with PACKET_VNET_HDR) can mark an IPv4 or IPv6 fragment as GSO; nothing relates gso_type to frag_off. inet_frag_reasm_prepare()/inet_frag_reasm_finish() keep the first fragment's skb as the head of the reassembled datagram, including its shinfo->gso_size/gso_type/gso_segs, and chain the remaining fragments on frag_list with whatever linear/paged layout they arrived with. After ip_defrag() (ip_local_deliver(), nf_defrag_ipv4, ...) the reassembled skb therefore still claims to be GSO (SKB_GSO_DODGY), and the next software segmentation point - udp_rcv_segment() on local delivery, validate_xmit_skb(), or the ip_finish_output_gso() slow path - hands it to skb_segment(). skb_segment()'s frag_list walk assumes GRO-shaped input and hits one of its BUG_ON()s. Two writes to a tap by an unprivileged user in its own userns are enough: kernel BUG at net/core/skbuff.c:4899! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 1000 PID: 82 Comm: poc Not tainted 7.2.0-pentest+ #2 RIP: 0010:skb_segment+0x20ca/0x48b0 Call Trace: __udp_gso_segment+0x29a/0x27d0 udp4_ufo_fragment+0x458/0x6c0 inet_gso_segment+0x429/0x1340 skb_mac_gso_segment+0x233/0x4f0 __skb_gso_segment+0x308/0x660 udp_queue_rcv_skb+0x440/0xad0 udp_unicast_rcv_skb+0xc7/0x2c0 udp_rcv+0x16ce/0x2260 ip_protocol_deliver_rcu+0x197/0x2d0 ip_local_deliver+0x430/0
CVE-2026-80590
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80590
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "29dda278a5ed272f2230ff4eaa23cf403107bba0",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "3edf721bb4b99d272c336631b44e3d8ff9a4f31b",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "dec2edb7aaf12a8878b3a03172ea8fc277b8eaad",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "69b73b74d9eb45f5560a8fe4fa406ada580e1340",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "da857e448322a2e871ce3ecc2900027041160d43",
"versionType": "git"
},
{
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"lessThan": "d5dc1e69fd7258ea605c9952e5d5947539159ae3",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/inet_fragment.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.27"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.27",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.268",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.219",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.186",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.155",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.107",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.48",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.12",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.2",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/inet_fragment.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80590
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34776 · Revision 1
- Added to Heist Feed
- Publisher date