CVE-2026-52923
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
ipc: limit next_id allocation to the valid ID range
The checkpoint/restore sysctl path can request the next SysV IPC id through ids->next_id. ipc_idr_alloc() currently forwards that request to idr_alloc() with an open-ended upper bound.
If the valid tail of the SysV IPC id space is full, the allocation can spill beyond ipc_mni. The returned SysV IPC id still uses the normal index encoding, so later lookup and removal can target the wrong slot. This leaves the real IDR entry behind and breaks the IDR state for the object.
The bug is in ipc_idr_alloc() in the checkpoint/restore path.
Leer descripción completaMostrar menos
1. ids->next_id is passed to:
4. Later removal goes through ipc_rmid(), which uses:
Prevent this by bounding the requested allocation to ipc_mni so the checkpoint/restore path fails once the valid range is exhausted.
Detalles técnicos trazas, registros y código del informe original
idr_alloc(&ids->ipcs_idr, new, ipcid_to_idx(next_id), 0, ...)
2. The zero upper bound makes the allocation effectively open-ended.
Once the valid SysV IPC tail is occupied, idr_alloc() can spill past
ipc_mni and allocate an entry beyond the valid IPC id range.
3. The new object id is still encoded with the narrower SysV IPC index
width:
new->id = (new->seq << ipcmni_seq_shift()) + idx
ipcid_to_idx(ipcp->id)
That truncates the real IDR index. An object actually stored at a
high index can then be removed as if it lived at a low in-range
index.
5. For shared memory, shm_destroy() frees the current object anyway, but
the real high IDR slot is left behind as a dangling pointer.
6. A subsequent walk of /proc/sysvipc/shm reaches the stale IDR entry
and dereferences freed memory.CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1499.004Application or System Exploitationimpact80 %
AV:L PR:L indica escalada local. La fuga de memoria (dangling pointer) causa DoS al desreferenciar memoria liberada, potencialmente con lectura de datos sensibles antes del crash.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-401
- CWE-825
Referencias
- https://git.kernel.org/stable/c/157ce2c6836ce0ff19108a819f38df061345425f
- https://git.kernel.org/stable/c/3bbe2bb9111ce6967a951bfac79af142d816fae5
- https://git.kernel.org/stable/c/41058d4c3f63ab64901560a704882e0565f4e456
- https://git.kernel.org/stable/c/8c58a92849175f5e2ab7bc2734b3b89afe79f6ef
- https://git.kernel.org/stable/c/a3cc795129e5ec0f8948653a3bf471e7d8852f5e
- https://git.kernel.org/stable/c/af24e202b543ded8a34f1d5d3db54eb916173f04
- https://git.kernel.org/stable/c/bd4be70669af55b974860d13680348cfdf50bbed
- https://git.kernel.org/stable/c/fa0b9b2b7ae3539908d69c2b9ac0d144d9bc5139
- https://access.redhat.com/errata/RHSA-2026:47248
- https://access.redhat.com/errata/RHSA-2026:48386
- https://access.redhat.com/errata/RHSA-2026:49031
- https://access.redhat.com/errata/RHSA-2026:49212
- https://access.redhat.com/errata/RHSA-2026:49851
- https://access.redhat.com/errata/RHSA-2026:49857
- https://access.redhat.com/errata/RHSA-2026:51603
- https://access.redhat.com/errata/RHSA-2026:51604
- https://access.redhat.com/errata/RHSA-2026:52649
- https://access.redhat.com/errata/RHSA-2026:52764
- https://access.redhat.com/errata/RHSA-2026:53330
- https://access.redhat.com/errata/RHSA-2026:61692
- https://access.redhat.com/errata/RHSA-2026:63189
- https://access.redhat.com/security/cve/CVE-2026-52923
- https://bugzilla.redhat.com/show_bug.cgi?id=2492094
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52923.json
JSON original (NVD)
Mostrar
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"url": "https://access.redhat.com/security/cve/CVE-2026-52923",
"tags": [
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"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492094",
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"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-401"
}
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},
{
"type": "Secondary",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"description": [
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"lang": "en",
"value": "CWE-825"
}
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}
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipc: limit next_id allocation to the valid ID range\n\nThe checkpoint/restore sysctl path can request the next SysV IPC id\nthrough ids->next_id. ipc_idr_alloc() currently forwards that request to\nidr_alloc() with an open-ended upper bound.\n\nIf the valid tail of the SysV IPC id space is full, the allocation can\nspill beyond ipc_mni. The returned SysV IPC id still uses the normal\nindex encoding, so later lookup and removal can target the wrong slot. \nThis leaves the real IDR entry behind and breaks the IDR state for the\nobject.\n\nThe bug is in ipc_idr_alloc() in the checkpoint/restore path.\n\n1. ids->next_id is passed to:\n\n idr_alloc(&ids->ipcs_idr, new, ipcid_to_idx(next_id), 0, ...)\n\n2. The zero upper bound makes the allocation effectively open-ended.\n Once the valid SysV IPC tail is occupied, idr_alloc() can spill past\n ipc_mni and allocate an entry beyond the valid IPC id range.\n\n3. The new object id is still encoded with the narrower SysV IPC index\n width:\n\n new->id = (new->seq << ipcmni_seq_shift()) + idx\n\n4. Later removal goes through ipc_rmid(), which uses:\n\n ipcid_to_idx(ipcp->id)\n\n That truncates the real IDR index. An object actually stored at a\n high index can then be removed as if it lived at a low in-range\n index.\n\n5. For shared memory, shm_destroy() frees the current object anyway, but\n the real high IDR slot is left behind as a dangling pointer.\n\n6. A subsequent walk of /proc/sysvipc/shm reaches the stale IDR entry\n and dereferences freed memory.\n\nPrevent this by bounding the requested allocation to ipc_mni so the\ncheckpoint/restore path fails once the valid range is exhausted."
}
],
"lastModified": "2026-09-04T13:20:02.593",
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