CVE-2025-21683 (GCVE-0-2025-21683)
Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-10-15 01:03
VLAI
EPSS
VEX
Title
bpf: Fix bpf_sk_select_reuseport() memory leak
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix bpf_sk_select_reuseport() memory leak
As pointed out in the original comment, lookup in sockmap can return a TCP
ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF
set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb
does not imply a non-refcounted socket.
Drop sk's reference in both error paths.
unreferenced object 0xffff888101911800 (size 2048):
comm "test_progs", pid 44109, jiffies 4297131437
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 9336483b):
__kmalloc_noprof+0x3bf/0x560
__reuseport_alloc+0x1d/0x40
reuseport_alloc+0xca/0x150
reuseport_attach_prog+0x87/0x140
sk_reuseport_attach_bpf+0xc8/0x100
sk_setsockopt+0x1181/0x1990
do_sock_setsockopt+0x12b/0x160
__sys_setsockopt+0x7b/0xc0
__x64_sys_setsockopt+0x1b/0x30
do_syscall_64+0x93/0x180
entry_SYSCALL_64_after_hwframe+0x76/0x7e
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:51 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
9 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
64d85290d79c0677edb5a8ee2295b36c022fa5df , < bb36838dac7bb334a3f3d7eb29875593ec9473fc
(git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf (git) Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < d0a3b3d1176d39218b8edb2a2d03164942ab9ccd (git) Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < b02e70be498b138e9c21701c2f33f4018ca7cd5e (git) Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < cccd51dd22574216e64e5d205489e634f86999f3 (git) Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < b3af60928ab9129befa65e6df0310d27300942bf (git) |
guessed | |
| Linux | Linux |
Affected:
5.8
Unaffected: 0 , < 5.8 (semver) Unaffected: 5.10.234 , ≤ 5.10.* (semver) Unaffected: 5.15.177 , ≤ 5.15.* (semver) Unaffected: 6.1.127 , ≤ 6.1.* (semver) Unaffected: 6.6.74 , ≤ 6.6.* (semver) Unaffected: 6.12.11 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se solucion\u00f3 la p\u00e9rdida de memoria de bpf_sk_select_reuseport() Como se se\u00f1al\u00f3 en el comentario original, la b\u00fasqueda en sockmap puede devolver un socket TCP ESTABLISHED. Es posible que dicho socket TCP haya tenido SO_ATTACH_REUSEPORT_EBPF configurado antes de que se estableciera. En otras palabras, un sk_reuseport_cb que no sea NULL no implica un socket sin referencia. Elimine la referencia de sk en ambas rutas de error. objeto sin referencia 0xffff888101911800 (tama\u00f1o 2048): comm \"test_progs\", pid 44109, jiffies 4297131437 volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ seguimiento inverso (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entrada_SYSCALL_64_despu\u00e9s_hwframe+0x76/0x7e"
}
],
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"lastModified": "2026-06-17T08:44:00.843",
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},
{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
}
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"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Fix bpf_sk_select_reuseport() memory leak",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21683.json",
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},
"vulnrichment": {
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{
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],
"title": "CVE Program Container"
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{
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"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"vendor": "Siemens",
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"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",
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},
{
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{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_sk_select_reuseport() memory leak\n\nAs pointed out in the original comment, lookup in sockmap can return a TCP\nESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF\nset before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb\ndoes not imply a non-refcounted socket.\n\nDrop sk\u0027s reference in both error paths.\n\nunreferenced object 0xffff888101911800 (size 2048):\n comm \"test_progs\", pid 44109, jiffies 4297131437\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace (crc 9336483b):\n __kmalloc_noprof+0x3bf/0x560\n __reuseport_alloc+0x1d/0x40\n reuseport_alloc+0xca/0x150\n reuseport_attach_prog+0x87/0x140\n sk_reuseport_attach_bpf+0xc8/0x100\n sk_setsockopt+0x1181/0x1990\n do_sock_setsockopt+0x12b/0x160\n __sys_setsockopt+0x7b/0xc0\n __x64_sys_setsockopt+0x1b/0x30\n do_syscall_64+0x93/0x180\n entry_SYSCALL_64_after_hwframe+0x76/0x7e"
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.