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Linux KernelOperating system · Linux

CVE-2026-43059

HIGH · 7.8 CVSS v3.1 Published 2026-05-05
Fix available
A fix is available. Upgrade to 6.7 / 6.12.78 or later.
See remediation →
80/100
Remediation priority · High
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix list corruption and UAF in command complete handlers Commit 302a1f674c00 ("Bluetooth: MGMT: Fix possible UAFs") introduced mgmt_pending_valid(), which not only validates the pending command but also unlinks it from the pending list if it is valid. This change in semantics requires updates to several completion handlers to avoid list corruption and memory safety issues. This patch addresses two left-over issues from the aforementioned rework: 1. In mgmt_add_adv_patterns_monitor_complete(), mgmt_pending_remove() is replaced with mgmt_pending_free() in the success path. Since mgmt_pending_valid() already unlinks the command at the beginning of the function, calling mgmt_pending_remove() leads to a double list_del() and subsequent list corruption/kernel panic. 2. In set_mesh_complete(), the use of mgmt_pending_foreach() in the error path is removed. Since the current command is already unlinked by mgmt_pending_valid(), this foreach loop would incorrectly target other pending mesh commands, potentially freeing them while they are still being processed concurrently (leading to UAFs). The redundant mgmt_cmd_status() is also simplified to use cmd->opcode directly.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-416

Memory is used after it has been freed, so its contents — now potentially attacker-controlled — drive the program's behaviour. With careful heap grooming this becomes code execution. The fix requires disciplined ownership of memory and often a targeted rework of the object lifecycle.

General guidance for the use after free class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 6.6.140, < 6.7>= 6.12.59, < 6.12.78>= 6.16.10, < 6.17>= 6.17.1, < 6.18.20>= 6.19, < 6.19.10= 6.17= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.7 / 6.12.78 / 6.17 or later
Fixed in 6.76.12.786.17
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 6.7, 6.12.78, 6.17, or 6.18.20 (depending on which branch is in use)

  1. 1. Check the currently running kernel version using: uname -r
  2. 2. Identify which version range the current kernel falls into from the affected versions list
  3. 3. For kernels >= 6.6.140 and < 6.7: upgrade to kernel 6.7 or later
  4. 4. For kernels >= 6.12.59 and < 6.12.78: upgrade to kernel 6.12.78 or later
  5. 5. For kernels >= 6.16.10 and < 6.17: upgrade to kernel 6.17 or later
  6. 6. For kernels >= 6.17.1 and < 6.18.20: upgrade to kernel 6.18.20 or later
  7. 7. Reboot the system into the new kernel
  8. 8. Verify the fix is applied by checking the kernel version matches a fixed release
Caveat Kernel upgrades may require rebuilding out-of-tree modules; ensure compatibility with system dependencies before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-43059 in production — separate from our analysis above.

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What this is

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  • Version or environment caveats, and links to real fixes
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