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Linux KernelOperating system · Linux

CVE-2022-49205

HIGH · 7.8 CVSS v3.1 Published 2025-02-26
Fix available
A fix is available. Upgrade to 5.4.189 / 5.10.110 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: bpf, sockmap: Fix double uncharge the mem of sk_msg If tcp_bpf_sendmsg is running during a tear down operation, psock may be freed. tcp_bpf_sendmsg() tcp_bpf_send_verdict() sk_msg_return() tcp_bpf_sendmsg_redir() unlikely(!psock)) sk_msg_free() The mem of msg has been uncharged in tcp_bpf_send_verdict() by sk_msg_return(), and would be uncharged by sk_msg_free() again. When psock is null, we can simply returning an error code, this would then trigger the sk_msg_free_nocharge in the error path of __SK_REDIRECT and would have the side effect of throwing an error up to user space. This would be a slight change in behavior from user side but would look the same as an error if the redirect on the socket threw an error. This issue can cause the following info: WARNING: CPU: 0 PID: 2136 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x13c/0x260 Call Trace: <TASK> __sk_destruct+0x24/0x1f0 sk_psock_destroy+0x19b/0x1c0 process_one_work+0x1b3/0x3c0 worker_thread+0x30/0x350 ? process_one_work+0x3c0/0x3c0 kthread+0xe6/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 </TASK>

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-415

The same block of memory is freed twice, corrupting the allocator's bookkeeping in ways an attacker can shape toward code execution. It usually stems from tangled ownership of a pointer. The fix is clear, single ownership of each allocation and clearing pointers once they are freed.

General guidance for the double 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:>= 4.20, < 5.4.189>= 5.5, < 5.10.110>= 5.11, < 5.15.33>= 5.16, < 5.16.19>= 5.17, < 5.17.2

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 5.4.189 / 5.10.110 / 5.15.33 or later
Fixed in 5.4.1895.10.1105.15.33
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 5.4.189+ / 5.10.110+ / 5.15.33+ / 5.16.19+ (depending on your branch)

  1. 1. Identify the currently running Linux kernel version using `uname -r`
  2. 2. Determine which version branch your kernel falls into (4.20-5.4.x, 5.5-5.10.x, 5.11-5.15.x, or 5.16.x)
  3. 3. For kernels 4.20 to <5.4.189: upgrade to kernel version 5.4.189 or later
  4. 4. For kernels 5.5 to <5.10.110: upgrade to kernel version 5.10.110 or later
  5. 5. For kernels 5.11 to <5.15.33: upgrade to kernel version 5.15.33 or later
  6. 6. For kernels 5.16 to <5.16.19: upgrade to kernel version 5.16.19 or later
  7. 7. Apply the upgrade via distribution-specific package manager (e.g., `apt-get dist-upgrade`, `yum update`, or rebuild from upstream stable sources
  8. 8. Reboot the system into the updated kernel
Caveat Kernel upgrades may require system reboots and could introduce compatibility issues with custom modules or older drivers; test in staging environment first

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 $1,950. 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-2022-49205 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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