CVE-2023-53441 (GCVE-0-2023-53441)
Vulnerability from cvelistv5 – Published: 2025-09-18 16:04 – Updated: 2026-05-11 19:45
VLAI
EPSS
VEX
Title
bpf: cpumap: Fix memory leak in cpu_map_update_elem
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: cpumap: Fix memory leak in cpu_map_update_elem
Syzkaller reported a memory leak as follows:
BUG: memory leak
unreferenced object 0xff110001198ef748 (size 192):
comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s)
hex dump (first 32 bytes):
00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J...........
00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(.......
backtrace:
[<ffffffffadd28087>] __cpu_map_entry_alloc+0xf7/0xb00
[<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0
[<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520
[<ffffffffadc7349b>] map_update_elem+0x4cb/0x720
[<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90
[<ffffffffb029cc80>] do_syscall_64+0x30/0x40
[<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
BUG: memory leak
unreferenced object 0xff110001198ef528 (size 192):
comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffffadd281f0>] __cpu_map_entry_alloc+0x260/0xb00
[<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0
[<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520
[<ffffffffadc7349b>] map_update_elem+0x4cb/0x720
[<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90
[<ffffffffb029cc80>] do_syscall_64+0x30/0x40
[<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
BUG: memory leak
unreferenced object 0xff1100010fd93d68 (size 8):
comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s)
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00 ........
backtrace:
[<ffffffffade5db3e>] kvmalloc_node+0x11e/0x170
[<ffffffffadd28280>] __cpu_map_entry_alloc+0x2f0/0xb00
[<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0
[<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520
[<ffffffffadc7349b>] map_update_elem+0x4cb/0x720
[<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90
[<ffffffffb029cc80>] do_syscall_64+0x30/0x40
[<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
In the cpu_map_update_elem flow, when kthread_stop is called before
calling the threadfn of rcpu->kthread, since the KTHREAD_SHOULD_STOP bit
of kthread has been set by kthread_stop, the threadfn of rcpu->kthread
will never be executed, and rcpu->refcnt will never be 0, which will
lead to the allocated rcpu, rcpu->queue and rcpu->queue->queue cannot be
released.
Calling kthread_stop before executing kthread's threadfn will return
-EINTR. We can complete the release of memory resources in this state.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:18 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < d26299f50f5ea8f0aeb5d49e659c31f64233c816
(git)
Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < b11a9b4f28cb6ff69ef7e69809e5f7fffeac9030 (git) Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < a957ac8e0b5ffb5797382a6adbafd005a5f72851 (git) Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < 4369016497319a9635702da010d02af1ebb1849d (git) |
guessed | |
| Linux | Linux |
Affected:
4.15
Unaffected: 0 , < 4.15 (semver) Unaffected: 5.15.121 , ≤ 5.15.* (semver) Unaffected: 6.1.40 , ≤ 6.1.* (semver) Unaffected: 6.4.5 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: cpumap: Fix memory leak in cpu_map_update_elem\n\nSyzkaller reported a memory leak as follows:\n\nBUG: memory leak\nunreferenced object 0xff110001198ef748 (size 192):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 32 bytes):\n 00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J...........\n 00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(.......\n backtrace:\n [\u003cffffffffadd28087\u003e] __cpu_map_entry_alloc+0xf7/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff110001198ef528 (size 192):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [\u003cffffffffadd281f0\u003e] __cpu_map_entry_alloc+0x260/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff1100010fd93d68 (size 8):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 8 bytes):\n 00 00 00 00 00 00 00 00 ........\n backtrace:\n [\u003cffffffffade5db3e\u003e] kvmalloc_node+0x11e/0x170\n [\u003cffffffffadd28280\u003e] __cpu_map_entry_alloc+0x2f0/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nIn the cpu_map_update_elem flow, when kthread_stop is called before\ncalling the threadfn of rcpu-\u003ekthread, since the KTHREAD_SHOULD_STOP bit\nof kthread has been set by kthread_stop, the threadfn of rcpu-\u003ekthread\nwill never be executed, and rcpu-\u003erefcnt will never be 0, which will\nlead to the allocated rcpu, rcpu-\u003equeue and rcpu-\u003equeue-\u003equeue cannot be\nreleased.\n\nCalling kthread_stop before executing kthread\u0027s threadfn will return\n-EINTR. We can complete the release of memory resources in this state."
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2023-53441",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-14T19:18:06.942324Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-09-18T16:15:48.353",
"references": [
{
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"tags": [
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"vulnStatus": "Modified",
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"type": "Primary"
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},
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"current_release_date": "2026-06-30T10:25:44+00:00",
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"product_status:fixed": "399",
"product_status:known_affected": "38",
"product_status:known_not_affected": "118",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: cpumap: Fix memory leak in cpu_map_update_elem",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53441.json",
"version": "3"
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"metrics": [
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"other": {
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],
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: cpumap: Fix memory leak in cpu_map_update_elem\n\nSyzkaller reported a memory leak as follows:\n\nBUG: memory leak\nunreferenced object 0xff110001198ef748 (size 192):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 32 bytes):\n 00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J...........\n 00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(.......\n backtrace:\n [\u003cffffffffadd28087\u003e] __cpu_map_entry_alloc+0xf7/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff110001198ef528 (size 192):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [\u003cffffffffadd281f0\u003e] __cpu_map_entry_alloc+0x260/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff1100010fd93d68 (size 8):\n comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n hex dump (first 8 bytes):\n 00 00 00 00 00 00 00 00 ........\n backtrace:\n [\u003cffffffffade5db3e\u003e] kvmalloc_node+0x11e/0x170\n [\u003cffffffffadd28280\u003e] __cpu_map_entry_alloc+0x2f0/0xb00\n [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n [\u003cffffffffb0400099\u003e] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nIn the cpu_map_update_elem flow, when kthread_stop is called before\ncalling the threadfn of rcpu-\u003ekthread, since the KTHREAD_SHOULD_STOP bit\nof kthread has been set by kthread_stop, the threadfn of rcpu-\u003ekthread\nwill never be executed, and rcpu-\u003erefcnt will never be 0, which will\nlead to the allocated rcpu, rcpu-\u003equeue and rcpu-\u003equeue-\u003equeue cannot be\nreleased.\n\nCalling kthread_stop before executing kthread\u0027s threadfn will return\n-EINTR. We can complete the release of memory resources in this state."
}
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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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