- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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 network header before routing and forwarding"): a stale network header offset reaching a consumer that widens it. Here it originates in the MPLS push/pop path. Clear inner_protocol once the packet is no longer MPLS, so a later push re-records the current header. net/sched/act_mpls.c is the only other skb_mpls_pop() caller and gets the same fix; sch_frag.c saves and restores inner_protocol around fragmentation in the same way OVS does.
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 55ed97db27bffe29c21fdefd5d25601322c36ff8
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 833ec2788322306407503b4cfc7745cd1f9d785f
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 0b3425fd0ecd515997956f7bb8a8a576b444ed64
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 011e17b5cae19b9f6a150923275e41c278de64f0
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < b39120523475d6b436be7f6cb27d48064148a327
- affected 48d2ab609b6bbecb7698487c8579bc40de9d6dfa – < 78a86d75a70e1e227711c72865c59b1422d0a5ae
- affected 4.9
- unaffected < 4.9
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/55ed97db27bffe29c21fdefd5d25601322c36ff8 (opens in a new tab)
- https://git.kernel.org/stable/c/833ec2788322306407503b4cfc7745cd1f9d785f (opens in a new tab)
- https://git.kernel.org/stable/c/38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34 (opens in a new tab)
- https://git.kernel.org/stable/c/0b3425fd0ecd515997956f7bb8a8a576b444ed64 (opens in a new tab)
- https://git.kernel.org/stable/c/011e17b5cae19b9f6a150923275e41c278de64f0 (opens in a new tab)
- https://git.kernel.org/stable/c/da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e (opens in a new tab)
- https://git.kernel.org/stable/c/b39120523475d6b436be7f6cb27d48064148a327 (opens in a new tab)
- https://git.kernel.org/stable/c/78a86d75a70e1e227711c72865c59b1422d0a5ae (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86743 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-97612)Record last updated .