CVE-2026-80634netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag The DEV_PATH_BR_VLAN_UNTAG case post-decrements info->num_encaps inside WARN_ON_ONCE(). num_encaps is u8, so if it's already 0 the decrement still happens and wraps it to 255. The break only leaves the inner switch -- a later path entry can set info->indev back to a real device, and we end up returning with num_encaps == 255. nft_dev_forward_path() then walks info.encap[] (size 2) up to num_encaps, which means an OOB stack read and a bogus count copied into the route descriptor. Should only happen on a malformed bridge path stack, hence the WARN, but worth handling sanely. Move the decrement out of the WARN. [ While at this, remove the WARN_ON_ONCE since this can only happen with a buggy bridge path stack --pablo ].
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e990cef6516daa4e1e236433579e333f74fd38cb before 547ea9f567498e4accc89e7816264f15a1a0629f; from e990cef6516daa4e1e236433579e333f74fd38cb before 2f55fa28011c97d6495d5787808db10a8c2d690d; from e990cef6516daa4e1e236433579e333f74fd38cb before e052f920773b73be49eb4d8702a9f85de7464363 | CNA record |
References
- https://git.kernel.org/stable/c/547ea9f567498e4accc89e7816264f15a1a0629f
- https://git.kernel.org/stable/c/2f55fa28011c97d6495d5787808db10a8c2d690d
- https://git.kernel.org/stable/c/e052f920773b73be49eb4d8702a9f85de7464363
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.