CVE-2023-54156 (GCVE-0-2023-54156)
Vulnerability from cvelistv5 – Published: 2025-12-24 13:07 – Updated: 2026-08-05 09:17
VLAI
EPSS
VEX
Title
sfc: fix crash when reading stats while NIC is resetting
Summary
In the Linux kernel, the following vulnerability has been resolved:
sfc: fix crash when reading stats while NIC is resetting
efx_net_stats() (.ndo_get_stats64) can be called during an ethtool
selftest, during which time nic_data->mc_stats is NULL as the NIC has
been fini'd. In this case do not attempt to fetch the latest stats
from the hardware, else we will crash on a NULL dereference:
BUG: kernel NULL pointer dereference, address: 0000000000000038
RIP efx_nic_update_stats
abridged calltrace:
efx_ef10_update_stats_pf
efx_net_stats
dev_get_stats
dev_seq_printf_stats
Skipping the read is safe, we will simply give out stale stats.
To ensure that the free in efx_ef10_fini_nic() does not race against
efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the
efx->stats_lock in fini_nic (it is already held across update_stats).
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb
(git)
Affected: d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67 (git) Affected: d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < 446f5567934331923d0aec4ce045e4ecb0174aae (git) Affected: d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < 470152d76b3ed107d172ea46acc4bfa941f20b4b (git) Affected: d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < aba32b4c58112960c0c708703ca6b44dc8944082 (git) Affected: d3142c193dca9a2f6878f4128ce1aaf221bb3f99 , < d1b355438b8325a486f087e506d412c4e852f37b (git) |
guessed | |
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.188 , ≤ 5.10.* (semver) Unaffected: 5.15.121 , ≤ 5.15.* (semver) Unaffected: 6.1.39 , ≤ 6.1.* (semver) Unaffected: 6.3.13 , ≤ 6.3.* (semver) Unaffected: 6.4.4 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"programFiles": [
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"vendor": "Linux",
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"version": "5.15.121",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.3.*",
"status": "unaffected",
"version": "6.3.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.4.*",
"status": "unaffected",
"version": "6.4.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.188",
"versionStartIncluding": "5.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.4.4",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
],
"negate": false,
"operator": "OR"
}
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix crash when reading stats while NIC is resetting\n\nefx_net_stats() (.ndo_get_stats64) can be called during an ethtool\n selftest, during which time nic_data-\u003emc_stats is NULL as the NIC has\n been fini\u0027d. In this case do not attempt to fetch the latest stats\n from the hardware, else we will crash on a NULL dereference:\n BUG: kernel NULL pointer dereference, address: 0000000000000038\n RIP efx_nic_update_stats\n abridged calltrace:\n efx_ef10_update_stats_pf\n efx_net_stats\n dev_get_stats\n dev_seq_printf_stats\nSkipping the read is safe, we will simply give out stale stats.\nTo ensure that the free in efx_ef10_fini_nic() does not race against\n efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the\n efx-\u003estats_lock in fini_nic (it is already held across update_stats)."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable code is reached only through local interfaces that read netdev statistics \u2014 /proc/net/dev, /sys/class/net/*/statistics/*, rtnetlink RTM_GETLINK, or ethtool -S \u2014 all requiring local access to the host. No remote peer can drive `.ndo_get_stats64`.\nAC:L - The attacker fully controls the read side and the vulnerable state persists for the entire duration of a reset or offline BIST selftest (seconds), so a simple polling loop hits it deterministically rather than winning a tight race; in a delegated-netns/SR-IOV deployment the attacker holds CAP_NET_ADMIN over the port and drives both sides (ethtool -t plus concurrent stats reads).\nPR:L - Reading /proc/net/dev or the sysfs statistics files requires no capability whatsoever, only an unprivileged local account; where the attacker also triggers the reset, CAP_NET_ADMIN over a namespace-delegated port is obtainable by an unprivileged user and counts as Low per kernel scoring guidance.\nUI:N - No victim action is needed \u2014 the attacker polls statistics continuously and the crash fires on the next reset, and in the strongest scenario the attacker initiates the reset themselves.\nS:U - The corruption and crash are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unsynchronized kfree lets `efx_nic_update_stats()` read a freed (and potentially reallocated) kmalloc-1k object and export its 16/32/64-bit contents to unprivileged userspace as network stat counters, disclosing freed kernel heap data; UAF read primitives are scored High.\nI:H - In the same race `efx_nic_copy_stats()` memcpy()s ~768 bytes of DMA\u0027d MAC counters into the freed buffer, repeating for up to 10 ms in its retry loop, giving a use-after-free write into a sprayable slab with counter values an attacker can influence by shaping traffic to the NIC.\nA:H - The documented outcome is a kernel NULL pointer dereference oops at 0x38 in `efx_nic_update_stats()`, taken while holding `spin_lock_bh(\u0026efx-\u003estats_lock)` \u2014 the lock is then never released, so every later stats reader spins with BH disabled, producing a hang on top of the oops (or an immediate panic where panic_on_oops is set)."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:17:42.126Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb"
},
{
"url": "https://git.kernel.org/stable/c/91f4ef204e731565afdc6c2a7fcf509a3fd6fd67"
},
{
"url": "https://git.kernel.org/stable/c/446f5567934331923d0aec4ce045e4ecb0174aae"
},
{
"url": "https://git.kernel.org/stable/c/470152d76b3ed107d172ea46acc4bfa941f20b4b"
},
{
"url": "https://git.kernel.org/stable/c/aba32b4c58112960c0c708703ca6b44dc8944082"
},
{
"url": "https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b"
}
],
"title": "sfc: fix crash when reading stats while NIC is resetting",
"x_generator": {
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}
}
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"assignerShortName": "Linux",
"cveId": "CVE-2023-54156",
"datePublished": "2025-12-24T13:07:06.043Z",
"dateReserved": "2025-12-24T13:02:52.530Z",
"dateUpdated": "2026-08-05T09:17:42.126Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2023-54156",
"date": "2026-09-29",
"epss": "0.0022",
"percentile": "0.11253"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
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"vendor": "Linux",
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"vendor": "Linux",
"versions": [
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{
"lessThan": "5.9",
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{
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"version": "6.1.39",
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{
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"version": "6.3.13",
"versionType": "semver"
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{
"lessThanOrEqual": "6.4.*",
"status": "unaffected",
"version": "6.4.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix crash when reading stats while NIC is resetting\n\nefx_net_stats() (.ndo_get_stats64) can be called during an ethtool\n selftest, during which time nic_data-\u003emc_stats is NULL as the NIC has\n been fini\u0027d. In this case do not attempt to fetch the latest stats\n from the hardware, else we will crash on a NULL dereference:\n BUG: kernel NULL pointer dereference, address: 0000000000000038\n RIP efx_nic_update_stats\n abridged calltrace:\n efx_ef10_update_stats_pf\n efx_net_stats\n dev_get_stats\n dev_seq_printf_stats\nSkipping the read is safe, we will simply give out stale stats.\nTo ensure that the free in efx_ef10_fini_nic() does not race against\n efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the\n efx-\u003estats_lock in fini_nic (it is already held across update_stats)."
}
],
"id": "CVE-2023-54156",
"lastModified": "2026-08-04T11:16:34.440",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2025-12-24T13:16:17.630",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/446f5567934331923d0aec4ce045e4ecb0174aae"
},
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{
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"url": "https://git.kernel.org/stable/c/aba32b4c58112960c0c708703ca6b44dc8944082"
},
{
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"url": "https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:14:38+00:00",
"cve": "CVE-2023-54156",
"id": "CVE-2023-54156",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "279",
"product_status:known_affected": "70",
"product_status:known_not_affected": "118",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sfc: fix crash when reading stats while NIC is resetting",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54156.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-23T00:51:08Z",
"cve": "CVE-2023-54156",
"id": "CVE-2023-54156",
"initial_release_date": "2025-12-25T00:54:20Z",
"product_status:known_affected": "401",
"product_status:known_not_affected": "282",
"product_status:recommended": "437",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-54156",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54156.json",
"version": "42"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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