CVE-2025-68219
In the Linux kernel, the following vulnerability has been resolved:
cifs: fix memory leak in smb3_fs_context_parse_param error path
Add proper cleanup of ctx->source and fc->source to the cifs_parse_mount_err error handler. This ensures that memory allocated for the source strings is correctly freed on all error paths, matching the cleanup already performed in the success path by smb3_cleanup_fs_context_contents(). Pointers are also set to NULL after freeing to prevent potential double-free issues.
This change fixes a memory leak originally detected by syzbot. The leak occurred when processing Opt_source mount options if an error happened after ctx->source and fc->source were successfully allocated but before the function completed.
Leer descripción completaMostrar menos
The specific leak sequence was: 1. ctx->source = smb3_fs_context_fullpath(ctx, '/') allocates memory 2. fc->source = kstrdup(ctx->source, GFP_KERNEL) allocates more memory 3. A subsequent error jumps to cifs_parse_mount_err 4. The old error handler freed passwords but not the source strings, causing the memory to leak.
This issue was not addressed by commit e8c73eb7db0a ("cifs: client: fix memory leak in smb3_fs_context_parse_param"), which only fixed leaks from repeated fsconfig() calls but not this error path.
Patch updated with minor change suggested by kernel test robot
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: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
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-2025-68219",
"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": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
"lessThan": "7627864dc3121f39e220f5253a227edf472de59e",
"versionType": "git"
},
{
"status": "affected",
"version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
"lessThan": "48d69290270891f988e72edddd9688c20515421d",
"versionType": "git"
},
{
"status": "affected",
"version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
"lessThan": "37010021d7e0341bb241ca00bcbae31f2c50b23f",
"versionType": "git"
},
{
"status": "affected",
"version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
"lessThan": "7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/fs_context.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.118",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.60",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.10",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/fs_context.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-16T14:15:55.013",
"references": [
{
"url": "https://git.kernel.org/stable/c/37010021d7e0341bb241ca00bcbae31f2c50b23f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/48d69290270891f988e72edddd9688c20515421d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7627864dc3121f39e220f5253a227edf472de59e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix memory leak in smb3_fs_context_parse_param error path\n\nAdd proper cleanup of ctx->source and fc->source to the\ncifs_parse_mount_err error handler. This ensures that memory allocated\nfor the source strings is correctly freed on all error paths, matching\nthe cleanup already performed in the success path by\nsmb3_cleanup_fs_context_contents().\nPointers are also set to NULL after freeing to prevent potential\ndouble-free issues.\n\nThis change fixes a memory leak originally detected by syzbot. The\nleak occurred when processing Opt_source mount options if an error\nhappened after ctx->source and fc->source were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx->source = smb3_fs_context_fullpath(ctx, '/') allocates memory\n2. fc->source = kstrdup(ctx->source, GFP_KERNEL) allocates more memory\n3. A subsequent error jumps to cifs_parse_mount_err\n4. The old error handler freed passwords but not the source strings,\ncausing the memory to leak.\n\nThis issue was not addressed by commit e8c73eb7db0a (\"cifs: client:\nfix memory leak in smb3_fs_context_parse_param\"), which only fixed\nleaks from repeated fsconfig() calls but not this error path.\n\nPatch updated with minor change suggested by kernel test robot"
}
],
"lastModified": "2026-06-17T09:58:45.377",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}