Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix NHC entry use-after-free on error path lowpan_nhc_do_uncompression() looks up an NHC descriptor while holding lowpan_nhc_lock. If the descriptor has no uncompress callback, the error path drops the lock before printing nhc->name. lowpan_nhc_del() removes descriptors under the same lock and then relies on synchronize_net() before the owning module can be unloaded. That only waits for net RX RCU readers. lowpan_header_decompress() is also exported and can be reached from callers that are not necessarily covered by the net core RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive path. This leaves a race where one task drops lowpan_nhc_lock in the error path, another task unregisters and frees the matching descriptor after synchronize_net() returns, and the first task then dereferences nhc->name for the warning. With the post-unlock window widened, KASAN reports: BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220 Read of size 8 lowpan_nhc_do_uncompression lowpan_header_decompress Fix this by printing the warning before dropping lowpan_nhc_lock, so the descriptor name is read while unregister is still excluded. The malformed packet is still rejected with -ENOTSUPP.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before 9c2f5c0829a8c8b904dae36be6d8056b719ac605; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before 80b5c8779acee0550845394fb3e5176a398aa24c; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before cc27aea4d454abfb385ee2c9499c78b96db9b728; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before a8e3a94711134e898c6021a6b77374efa91b3639; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before 0beccbcf50de125be5520d0ffc59af4bb8655482; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before b713aa0cc344f10f7a9928a230b5f5e780d04078; affected 92aa7c65d295f3cbb96904afe335f683e55584b8 before 1720db928e5a58ca7d75ac1d514c3b73fd7061a7 |
| Linux / Linux | affected 4.1; unaffected 0 before 4.1; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605
- https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c
- https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728
- https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639
- https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168
- https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482
- https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078
- https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7
ADP enrichment
No English description supplied.
No references supplied.