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Linux KernelOperating system · Linux

CVE-2022-48647

MEDIUM · 5.5 CVSS v3.1 Published 2024-04-28
Fix available
A fix is available. Upgrade to 5.10.146 / 5.15.71 or later.
See remediation →
57/100
Remediation priority · Elevated
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: sfc: fix TX channel offset when using legacy interrupts In legacy interrupt mode the tx_channel_offset was hardcoded to 1, but that's not correct if efx_sepparate_tx_channels is false. In that case, the offset is 0 because the tx queues are in the single existing channel at index 0, together with the rx queue. Without this fix, as soon as you try to send any traffic, it tries to get the tx queues from an uninitialized channel getting these errors: WARNING: CPU: 1 PID: 0 at drivers/net/ethernet/sfc/tx.c:540 efx_hard_start_xmit+0x12e/0x170 [sfc] [...] RIP: 0010:efx_hard_start_xmit+0x12e/0x170 [sfc] [...] Call Trace: <IRQ> dev_hard_start_xmit+0xd7/0x230 sch_direct_xmit+0x9f/0x360 __dev_queue_xmit+0x890/0xa40 [...] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 [...] RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc] [...] Call Trace: <IRQ> dev_hard_start_xmit+0xd7/0x230 sch_direct_xmit+0x9f/0x360 __dev_queue_xmit+0x890/0xa40 [...]

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-476

The code follows a pointer that is null, crashing the process. An attacker who can reliably trigger it turns the crash into a denial of service. The fix is checking for null before use and handling the failure path gracefully.

General guidance for the null pointer dereference 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:>= 5.10.122, < 5.10.146>= 5.15.47, < 5.15.71>= 5.17.15, < 5.18>= 5.18.4, < 5.19.12= 6.0

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
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 5.10.146 / 5.15.71 / 5.18 or later
Fixed in 5.10.1465.15.715.18
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to Linux kernel 5.10.146, 5.15.71, 5.18, or 5.19.12 or later (choose the stable branch appropriate for your environment)

  1. 1. Identify the currently running Linux kernel version using `uname -r`
  2. 2. Check if the running version falls within any of the affected ranges: 5.10.122-5.10.145, 5.15.47-5.15.70, 5.17.15-5.17.x, or 5.18.4-5.19.11
  3. 3. If affected, schedule a maintenance window for kernel upgrade
  4. 4. Upgrade the Linux kernel to a fixed release: 5.10.146 or later, 5.15.71 or later, 5.18 or later, or 5.19.12 or later
  5. 5. If using a distribution such as RHEL, Ubuntu, or Debian, use the distribution's package manager to install the updated kernel package (e.g., `apt-get update && apt-get upgrade` or `yum update`)
  6. 6. Reboot the system to load the new kernel
  7. 7. After reboot, verify the new kernel version is running with `uname -r`
  8. 8. Test network functionality to confirm the SFC driver is working correctly
Caveat Kernel upgrades may require rebooting services and could have compatibility implications with out-of-tree kernel modules or specific hardware drivers; test in a 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 $2,850. 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-2022-48647 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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