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Linux KernelOperating system · Linux

CVE-2023-52907

MEDIUM · 5.5 CVSS v3.1 Published 2024-08-21
Fix available
A fix is available. Upgrade to 4.14.303 / 4.19.270 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: nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame() Fix a use-after-free that occurs in hcd when in_urb sent from pn533_usb_send_frame() is completed earlier than out_urb. Its callback frees the skb data in pn533_send_async_complete() that is used as a transfer buffer of out_urb. Wait before sending in_urb until the callback of out_urb is called. To modify the callback of out_urb alone, separate the complete function of out_urb and ack_urb. Found by a modified version of syzkaller. BUG: KASAN: use-after-free in dummy_timer Call Trace: memcpy (mm/kasan/shadow.c:65) dummy_perform_transfer (drivers/usb/gadget/udc/dummy_hcd.c:1352) transfer (drivers/usb/gadget/udc/dummy_hcd.c:1453) dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:1972) arch_static_branch (arch/x86/include/asm/jump_label.h:27) static_key_false (include/linux/jump_label.h:207) timer_expire_exit (include/trace/events/timer.h:127) call_timer_fn (kernel/time/timer.c:1475) expire_timers (kernel/time/timer.c:1519) __run_timers (kernel/time/timer.c:1790) run_timer_softirq (kernel/time/timer.c:1803)

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:>= 3.1, < 4.14.303>= 4.15, < 4.19.270>= 4.20, < 5.4.229>= 5.5, < 5.10.164>= 5.11, < 5.15.89>= 5.16, < 6.1.7= 6.2

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
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 4.14.303 / 4.19.270 / 5.4.229 or later
Fixed in 4.14.3034.19.2705.4.229
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to Linux kernel 4.14.303+, 4.19.270+, 5.4.229+, or 5.10.164+ (depending on your kernel branch)

  1. Identify the currently running Linux kernel version using `uname -r`
  2. Compare the current version against the vulnerable ranges: >= 3.1 and < 4.14.303, >= 4.15 and < 4.19.270, >= 4.20 and < 5.4.229, or >= 5.5 and < 5.10.164
  3. If the kernel is within an affected range, schedule a maintenance window for the upgrade
  4. Obtain the appropriate patched kernel for your distribution from your vendor's security advisory or from kernel.org
  5. Upgrade the kernel package using your distribution's package manager (e.g., `apt-get dist-upgrade`, `yum update`, or `dnf upgrade`)
  6. Reboot the system to load the patched kernel
  7. Verify the new kernel version is running and matches a fixed release (e.g., 4.14.303, 4.19.270, 5.4.229, or 5.10.164 or later)
Caveat Kernel upgrades may require reboot and could introduce compatibility issues with custom drivers or modules; test in staging 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-2023-52907 in production — separate from our analysis above.

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What this is

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