CVE-2026-64452 (GCVE-0-2026-64452)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-27 05:01
VLAI
Title
6lowpan: fix NHC entry use-after-free on error path
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.
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < 9c2f5c0829a8c8b904dae36be6d8056b719ac605 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < 80b5c8779acee0550845394fb3e5176a398aa24c (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < cc27aea4d454abfb385ee2c9499c78b96db9b728 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < a8e3a94711134e898c6021a6b77374efa91b3639 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < 0beccbcf50de125be5520d0ffc59af4bb8655482 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < b713aa0cc344f10f7a9928a230b5f5e780d04078 (git)
Affected: 92aa7c65d295f3cbb96904afe335f683e55584b8 , < 1720db928e5a58ca7d75ac1d514c3b73fd7061a7 (git)
Create a notification for this product.
Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix NHC entry use-after-free on error path\n\nlowpan_nhc_do_uncompression() looks up an NHC descriptor while holding\nlowpan_nhc_lock.  If the descriptor has no uncompress callback, the error\npath drops the lock before printing nhc-\u003ename.\n\nlowpan_nhc_del() removes descriptors under the same lock and then relies\non synchronize_net() before the owning module can be unloaded.  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."
        }
      ],
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            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "6lowpan: fix NHC entry use-after-free on error path",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/6lowpan/nhc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"9c2f5c0829a8c8b904dae36be6d8056b719ac605\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"80b5c8779acee0550845394fb3e5176a398aa24c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"cc27aea4d454abfb385ee2c9499c78b96db9b728\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"a8e3a94711134e898c6021a6b77374efa91b3639\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"0beccbcf50de125be5520d0ffc59af4bb8655482\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"b713aa0cc344f10f7a9928a230b5f5e780d04078\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"92aa7c65d295f3cbb96904afe335f683e55584b8\",\"lessThan\":\"1720db928e5a58ca7d75ac1d514c3b73fd7061a7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/6lowpan/nhc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.2,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-27T08:23:42+00:00",
      "cve": "CVE-2026-64452",
      "id": "CVE-2026-64452",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "119",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: 6lowpan: fix NHC entry use-after-free on error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64452.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:04Z",
      "cve": "CVE-2026-64452",
      "id": "CVE-2026-64452",
      "initial_release_date": "2026-07-25T15:59:04Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64452",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64452.json",
      "version": "2"
    }
  }
}



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