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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64452
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:30 UTC
Updated2026-07-27 05:16:52 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.002190000 probability, percentile 0.125020000 (date 2026-07-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 9c2f5c0829a8c8b904dae36be6d8056b719ac605 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 80b5c8779acee0550845394fb3e5176a398aa24c git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 cc27aea4d454abfb385ee2c9499c78b96db9b728 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 a8e3a94711134e898c6021a6b77374efa91b3639 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 0beccbcf50de125be5520d0ffc59af4bb8655482 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 b713aa0cc344f10f7a9928a230b5f5e780d04078 git Not specified
CNA Linux Linux affected 92aa7c65d295f3cbb96904afe335f683e55584b8 1720db928e5a58ca7d75ac1d514c3b73fd7061a7 git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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