CVE-2026-644526lowpan: fix NHC entry use-after-free on error path
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:R/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
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 92aa7c65d295f3cbb96904afe335f683e55584b8 builds before 9c2f5c0829a8c8b904dae36be6d8056b719ac605; 92aa7c65d295f3cbb96904afe335f683e55584b8 builds before 80b5c8779acee0550845394fb3e5176a398aa24c; from 92aa7c65d295f3cbb96904afe335f683e55584b8 before cc27aea4d454abfb385ee2c9499c78b96db9b728; from 92aa7c65d295f3cbb96904afe335f683e55584b8 before a8e3a94711134e898c6021a6b77374efa91b3639; from 92aa7c65d295f3cbb96904afe335f683e55584b8 before 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168; 92aa7c65d295f3cbb96904afe335f683e55584b8 builds before 0beccbcf50de125be5520d0ffc59af4bb8655482; from 92aa7c65d295f3cbb96904afe335f683e55584b8 before b713aa0cc344f10f7a9928a230b5f5e780d04078; from 92aa7c65d295f3cbb96904afe335f683e55584b8 before 1720db928e5a58ca7d75ac1d514c3b73fd7061a7 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605patch
- https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24cpatch
- https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728patch
- https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639patch
- https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168patch
- https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482patch
- https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078patch
- https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7patch
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.