CVE-2026-64452 (GCVE-0-2026-64452)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-10-19 20:38
Severity ?
7.1 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
Version: 92aa7c65d295f3cbb96904afe335f683e55584b8
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That only\\nwaits for net RX RCU readers.  lowpan_header_decompress() is also exported\\nand can be reached from callers that are not necessarily covered by the net\\ncore RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive\\npath.\\n\\nThis leaves a race where one task drops lowpan_nhc_lock in the error path,\\nanother task unregisters and frees the matching descriptor after\\nsynchronize_net() returns, and the first task then dereferences nhc-\u003ename\\nfor the warning.\\n\\nWith the post-unlock window widened, KASAN reports:\\n\\n  BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220\\n  Read of size 8\\n  lowpan_nhc_do_uncompression\\n  lowpan_header_decompress\\n\\nFix this by printing the warning before dropping lowpan_nhc_lock, so the\\ndescriptor name is read while unregister is still excluded.  The malformed\\npacket is still rejected with -ENOTSUPP.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"4.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:56.222Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64452\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:30.450Z\", \"dateReserved\": \"2026-07-19T15:36:31.788Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:51:21.754Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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