Description (CNA)
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 ].
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e990cef6516daa4e1e236433579e333f74fd38cb before 1b52aeb40c9f04bf50eeb4ea09142139d163e239; affected e990cef6516daa4e1e236433579e333f74fd38cb before ee8440bb000fff4ef8acbfc99652851e9ca0a35b; affected e990cef6516daa4e1e236433579e333f74fd38cb before 547ea9f567498e4accc89e7816264f15a1a0629f; affected e990cef6516daa4e1e236433579e333f74fd38cb before 2f55fa28011c97d6495d5787808db10a8c2d690d; affected e990cef6516daa4e1e236433579e333f74fd38cb before e052f920773b73be49eb4d8702a9f85de7464363 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1b52aeb40c9f04bf50eeb4ea09142139d163e239
- https://git.kernel.org/stable/c/ee8440bb000fff4ef8acbfc99652851e9ca0a35b
- https://git.kernel.org/stable/c/547ea9f567498e4accc89e7816264f15a1a0629f
- https://git.kernel.org/stable/c/2f55fa28011c97d6495d5787808db10a8c2d690d
- https://git.kernel.org/stable/c/e052f920773b73be49eb4d8702a9f85de7464363
ADP enrichment
No English description supplied.
No references supplied.