CVE-2026-644526lowpan: fix NHC entry use-after-free on error path
- 7.1HighCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% 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: 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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months 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 | High7.1 | CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < 9c2f5c0829a8c8b904dae36be6d8056b719ac605
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < 80b5c8779acee0550845394fb3e5176a398aa24c
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < cc27aea4d454abfb385ee2c9499c78b96db9b728
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < a8e3a94711134e898c6021a6b77374efa91b3639
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < 0beccbcf50de125be5520d0ffc59af4bb8655482
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < b713aa0cc344f10f7a9928a230b5f5e780d04078
- affected 92aa7c65d295f3cbb96904afe335f683e55584b8 – < 1720db928e5a58ca7d75ac1d514c3b73fd7061a7
- affected 4.1
- unaffected < 4.1
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605 (opens in a new tab)
- https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c (opens in a new tab)
- https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728 (opens in a new tab)
- https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639 (opens in a new tab)
- https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168 (opens in a new tab)
- https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482 (opens in a new tab)
- https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078 (opens in a new tab)
- https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7 (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-2026-48796 (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-2026-64452)Record last updated .