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6lowpan: fix NHC entry use-after-free on error path

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-64452

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64452

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "92aa7c65d295f3cbb96904afe335f683e55584b8",
        "lessThan": "9c2f5c0829a8c8b904dae36be6d8056b719ac605",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "92aa7c65d295f3cbb96904afe335f683e55584b8",
        "lessThan": "80b5c8779acee0550845394fb3e5176a398aa24c",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "cc27aea4d454abfb385ee2c9499c78b96db9b728",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "a8e3a94711134e898c6021a6b77374efa91b3639",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "0beccbcf50de125be5520d0ffc59af4bb8655482",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "b713aa0cc344f10f7a9928a230b5f5e780d04078",
        "versionType": "git"
      },
      {
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        "lessThan": "1720db928e5a58ca7d75ac1d514c3b73fd7061a7",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/6lowpan/nhc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/6lowpan/nhc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64452

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41053 · Revision 1
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Publisher date
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