net: mpls: clear inner_protocol when the last label is popped
In the Linux kernel, the following vulnerability has been resolved: net: mpls: clear inner_protocol when the last label is popped skb_mpls_push() records the pre-encapsulation network header once, gated on !skb->inner_protocol. skb_mpls_pop() never clears that record, so it outlives the encapsulation it describes. Open vSwitch can then re-push MPLS onto a packet whose inner_network_header still points at the older, deeper offset: push a label, pop every label, recirculate (ovs_flow_key_update() re-derives key->eth.type and resets network_header, but leaves inner_*), then push again. ovs_fragment() trusts the record: skb->network_header = skb->inner_network_header; so skb_network_offset() goes negative. The bound check is signed: if (skb_network_offset(skb) > MAX_L2_LEN) a negative offset passes it, and prepare_frag() widens the value: unsigned int hlen = skb_network_offset(skb); memcpy(&data->l2_data, skb->data, hlen); which is a ~4GiB memcpy out of a 30-byte per-CPU buffer. Reproduced on v7.3-rc1. RDX is the truncated length, (unsigned int)(-8): BUG: unable to handle page fault for address: ffffe8ffffc16000 #PF: supervisor write access in kernel mode Oops: 0002 [#1] SMP KASAN NOPTI RIP: 0010:memcpy+0x8/0x20 RDX: 00000000fffffff8 RSI: ffff888105d732db RDI: ffffe8ffffc16000 prepare_frag+0x3df/0x4e0 ovs_fragment+0x589/0x7e0 do_output+0x4ce/0x5e0 do_execute_actions+0x55d2/0x7b30 ovs_execute_actions+0xea/0x450 Same root-cause shape as commit 975b5b067f52 ("ipv6: sr: restore netwo
CVE-2026-97612
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-2026-97612
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": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "55ed97db27bffe29c21fdefd5d25601322c36ff8",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "833ec2788322306407503b4cfc7745cd1f9d785f",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "0b3425fd0ecd515997956f7bb8a8a576b444ed64",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "011e17b5cae19b9f6a150923275e41c278de64f0",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "b39120523475d6b436be7f6cb27d48064148a327",
"versionType": "git"
},
{
"status": "affected",
"version": "48d2ab609b6bbecb7698487c8579bc40de9d6dfa",
"lessThan": "78a86d75a70e1e227711c72865c59b1422d0a5ae",
"versionType": "git"
}
],
"programFiles": [
"net/core/skbuff.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/skbuff.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97612
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38049 · Revision 1
- Added to Heist Feed
- Publisher date