CVE-2025-68262
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
crypto: zstd - fix double-free in per-CPU stream cleanup
The crypto/zstd module has a double-free bug that occurs when multiple tfms are allocated and freed.
The issue happens because zstd_streams (per-CPU contexts) are freed in zstd_exit() during every tfm destruction, rather than being managed at the module level. When multiple tfms exist, each tfm exit attempts to free the same shared per-CPU streams, resulting in a double-free.
This leads to a stack trace similar to:
Change the lifecycle management of zstd_streams to free the streams only once during module cleanup.
Detalles técnicos trazas, registros y código del informe original
BUG: Bad page state in process kworker/u16:1 pfn:106fd93 page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93 flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: nonzero entire_mapcount Modules linked in: ... CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G B Hardware name: ... Workqueue: btrfs-delalloc btrfs_work_helper Call Trace: <TASK> dump_stack_lvl+0x5d/0x80 bad_page+0x71/0xd0 free_unref_page_prepare+0x24e/0x490 free_unref_page+0x60/0x170 crypto_acomp_free_streams+0x5d/0xc0 crypto_acomp_exit_tfm+0x23/0x50 crypto_destroy_tfm+0x60/0xc0 ...
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- 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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-68262",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969",
"lessThan": "dc0f4509b0ed5d82bef78e058db0ac4df04d0695",
"versionType": "git"
},
{
"status": "affected",
"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969",
"lessThan": "e983feaa79de1e46c9087fb9f02fedb0e5397ce6",
"versionType": "git"
},
{
"status": "affected",
"version": "f5ad93ffb54119a8dc5e18f070624d4ead586969",
"lessThan": "48bc9da3c97c15f1ea24934bcb3b736acd30163d",
"versionType": "git"
}
],
"programFiles": [
"crypto/zstd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.17.12",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18.1",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"crypto/zstd.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-16T15:15:55.697",
"references": [
{
"url": "https://git.kernel.org/stable/c/48bc9da3c97c15f1ea24934bcb3b736acd30163d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc0f4509b0ed5d82bef78e058db0ac4df04d0695",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e983feaa79de1e46c9087fb9f02fedb0e5397ce6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: zstd - fix double-free in per-CPU stream cleanup\n\nThe crypto/zstd module has a double-free bug that occurs when multiple\ntfms are allocated and freed.\n\nThe issue happens because zstd_streams (per-CPU contexts) are freed in\nzstd_exit() during every tfm destruction, rather than being managed at\nthe module level. When multiple tfms exist, each tfm exit attempts to\nfree the same shared per-CPU streams, resulting in a double-free.\n\nThis leads to a stack trace similar to:\n\n BUG: Bad page state in process kworker/u16:1 pfn:106fd93\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93\n flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: nonzero entire_mapcount\n Modules linked in: ...\n CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G B\n Hardware name: ...\n Workqueue: btrfs-delalloc btrfs_work_helper\n Call Trace:\n <TASK>\n dump_stack_lvl+0x5d/0x80\n bad_page+0x71/0xd0\n free_unref_page_prepare+0x24e/0x490\n free_unref_page+0x60/0x170\n crypto_acomp_free_streams+0x5d/0xc0\n crypto_acomp_exit_tfm+0x23/0x50\n crypto_destroy_tfm+0x60/0xc0\n ...\n\nChange the lifecycle management of zstd_streams to free the streams only\nonce during module cleanup."
}
],
"lastModified": "2026-06-17T09:58:49.730",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}