ghsa-hw4p-m7j2-x55f
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
md/raid1: Fix stack memory use after return in raid1_reshape
In the raid1_reshape function, newpool is allocated on the stack and assigned to conf->r1bio_pool. This results in conf->r1bio_pool.wait.head pointing to a stack address. Accessing this address later can lead to a kernel panic.
Example access path:
raid1_reshape() { // newpool is on the stack mempool_t newpool, oldpool; // initialize newpool.wait.head to stack address mempool_init(&newpool, ...); conf->r1bio_pool = newpool; }
raid1_read_request() or raid1_write_request() { alloc_r1bio() { mempool_alloc() { // if pool->alloc fails remove_element() { --pool->curr_nr; } } } }
mempool_free() { if (pool->curr_nr < pool->min_nr) { // pool->wait.head is a stack address // wake_up() will try to access this invalid address // which leads to a kernel panic return; wake_up(&pool->wait); } }
Fix: reinit conf->r1bio_pool.wait after assigning newpool.
{
"affected": [],
"aliases": [
"CVE-2025-38445"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-25T16:15:29Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1: Fix stack memory use after return in raid1_reshape\n\nIn the raid1_reshape function, newpool is\nallocated on the stack and assigned to conf-\u003er1bio_pool.\nThis results in conf-\u003er1bio_pool.wait.head pointing\nto a stack address.\nAccessing this address later can lead to a kernel panic.\n\nExample access path:\n\nraid1_reshape()\n{\n\t// newpool is on the stack\n\tmempool_t newpool, oldpool;\n\t// initialize newpool.wait.head to stack address\n\tmempool_init(\u0026newpool, ...);\n\tconf-\u003er1bio_pool = newpool;\n}\n\nraid1_read_request() or raid1_write_request()\n{\n\talloc_r1bio()\n\t{\n\t\tmempool_alloc()\n\t\t{\n\t\t\t// if pool-\u003ealloc fails\n\t\t\tremove_element()\n\t\t\t{\n\t\t\t\t--pool-\u003ecurr_nr;\n\t\t\t}\n\t\t}\n\t}\n}\n\nmempool_free()\n{\n\tif (pool-\u003ecurr_nr \u003c pool-\u003emin_nr) {\n\t\t// pool-\u003ewait.head is a stack address\n\t\t// wake_up() will try to access this invalid address\n\t\t// which leads to a kernel panic\n\t\treturn;\n\t\twake_up(\u0026pool-\u003ewait);\n\t}\n}\n\nFix:\nreinit conf-\u003er1bio_pool.wait after assigning newpool.",
"id": "GHSA-hw4p-m7j2-x55f",
"modified": "2025-07-25T18:30:39Z",
"published": "2025-07-25T18:30:39Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38445"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/12b00ec99624f8da8c325f2dd6e807df26df0025"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/48da050b4f54ed639b66278d0ae6f4107b2c4e2d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5f35e48b76655e45522df338876dfef88dafcc71"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61fd5e93006cf82ec8ee5c115ab5cf4bbd104bdb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/776e6186dc9ecbdb8a1b706e989166c8a99bbf64"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d67ed2ccd2d1dcfda9292c0ea8697a9d0f2f0d98"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d8a6853d00fbaa810765c8ed2f452a5832273968"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/df5894014a92ff0196dbc212a7764e97366fd2b7"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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