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CVE Record

CVE-2023-54073: tpm: Add !tpm_amd_is_rng_defective() to the hwrng_unregister() call site

In the Linux kernel, the following vulnerability has been resolved: tpm: Add !tpm_amd_is_rng_defective() to the hwrng_unregister() call site The following crash was reported: [ 1950.279393] list_del corruption, ffff99560d485790->next is NULL [ 1950.279400] ------------[ cut here ]------------ [ 1950.279401] kernel BUG at lib/list_debug.c:49! [ 1950.279405] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 1950.279407] CPU: 11 PID: 5886 Comm: modprobe Tainted: G O 6.2.8_1 #1 [ 1950.279409] Hardware name: Gigabyte Technology Co., Ltd. B550M AORUS PRO-P/B550M AORUS PRO-P, BIOS F15c 05/11/2022 [ 1950.279410] RIP: 0010:__list_del_entry_valid+0x59/0xc0 [ 1950.279415] Code: 48 8b 01 48 39 f8 75 5a 48 8b 72 08 48 39 c6 75 65 b8 01 00 00 00 c3 cc cc cc cc 48 89 fe 48 c7 c7 08 a8 13 9e e8 b7 0a bc ff <0f> 0b 48 89 fe 48 c7 c7 38 a8 13 9e e8 a6 0a bc ff 0f 0b 48 89 fe [ 1950.279416] RSP: 0018:ffffa96d05647e08 EFLAGS: 00010246 [ 1950.279418] RAX: 0000000000000033 RBX: ffff99560d485750 RCX: 0000000000000000 [ 1950.279419] RDX: 0000000000000000 RSI: ffffffff9e107c59 RDI: 00000000ffffffff [ 1950.279420] RBP: ffffffffc19c5168 R08: 0000000000000000 R09: ffffa96d05647cc8 [ 1950.279421] R10: 0000000000000003 R11: ffffffff9ea2a568 R12: 0000000000000000 [ 1950.279422] R13: ffff99560140a2e0 R14: ffff99560127d2e0 R15: 0000000000000000 [ 1950.279422] FS: 00007f67da795380(0000) GS:ffff995d1f0c0000(0000) knlGS:0000000000000000 [ 1950.279424] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1950.279424] CR2: 00007f67da7e65c0 CR3: 00000001feed2000 CR4: 0000000000750ee0 [ 1950.279426] PKRU: 55555554 [ 1950.279426] Call Trace: [ 1950.279428] <TASK> [ 1950.279430] hwrng_unregister+0x28/0xe0 [rng_core] [ 1950.279436] tpm_chip_unregister+0xd5/0xf0 [tpm] Add the forgotten !tpm_amd_is_rng_defective() invariant to the hwrng_unregister() call site inside tpm_chip_unregister().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel reliability vulnerability in the TPM random-number generator cleanup path. On affected kernels, unregistering a TPM chip can trigger list corruption and a kernel crash. The public record shows a resolved kernel bug, but not confirmed remote exploitation or business-impact details beyond system instability.

Executive priority

Handle through normal kernel patch management unless TPM-related crashes are affecting production. Escalate priority for fleets with AMD fTPM usage, custom kernels, or observed kernel BUG crashes.

Technical view

The flaw is a missing !tpm_amd_is_rng_defective() condition before hwrng_unregister() inside tpm_chip_unregister(). The reported failure is list_del corruption leading to a kernel BUG during modprobe on Linux 6.2.8. The source references stable kernel commits resolving the issue.

Likely exposure

Exposure appears limited to Linux systems running affected kernel builds with TPM support where the relevant AMD TPM RNG defective-path logic is exercised. The provided affected-version data is incomplete and should be validated against distribution kernel advisories and the referenced stable commits.

Exploitation context

The bundle provides a crash report and kernel fix references, but no KEV listing, public exploit claim, or remote attack path. Treat this as a potential local or operational stability issue unless vendor guidance states otherwise.

Researcher notes

The evidence supports a kernel cleanup-path bug causing list corruption during TPM chip unregister. The source does not provide CVSS, CWE, exploitability analysis, or precise downstream distribution ranges. Avoid asserting active exploitation or broad remote impact.

Mitigation direction

  • Update to a vendor-supported kernel containing the referenced stable fixes.
  • Check Linux distribution advisories for exact fixed package versions.
  • Prioritize systems using TPM hardware or AMD fTPM paths.
  • Avoid unsupported custom kernels without the referenced TPM fix.

Validation and detection

  • Inventory Linux kernel versions across TPM-enabled systems.
  • Confirm whether deployed kernels include one of the referenced stable commits.
  • Review kernel logs for TPM or hwrng unregister crashes.
  • Validate distribution package status against vendor advisories.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2023-54073 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb006c439d58db625318bf2207feabf847510a8a6, b006c439d58db625318bf2207feabf847510a8a6, b006c439d58db625318bf2207feabf847510a8a6, b006c439d58db625318bf2207feabf847510a8a6unaffected
LinuxLinux6.1, 0, 6.1.28, 6.2.15, 6.3.2, 6.4affected
Weakness

CWE details

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