CriticalFix available
md/raid10: reset read_slot when reusing r10bio for discard
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.212, 6.1.178, 6.12.97, 6.18.40, 6.6.145, 7.1.5
- CVEs
- CVE-2026-74376
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 19:45 UTC · Revision 1
Source evidence
md/raid10: reset read_slot when reusing r10bio for discard
core-osv · Original sourcePublished 15 Aug 2026, 05:58 UTC
In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.
osv:CVE-2026-74376
Kernel
Fixed versions: 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
Complete source record
{
"id": "6194529724307ff38e8d28ef8cdd3464bc37caf3dcdda4264121809b1b230645",
"url": "https://osv.dev/vulnerability/CVE-2026-74376",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "md/raid10: reset read_slot when reusing r10bio for discard",
"summary": "In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.",
"evidence": "osv:CVE-2026-74376",
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"severity": "critical",
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"aliases": [
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"metrics": [
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"events": [
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],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74376.json"
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],
"modified": "2026-10-28T02:30:38.752953179Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945",
"https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442",
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"https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853",
"https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74376.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-74376",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74376.json"
}
},
"related_cves": [
{
"value": "CVE-2026-74376",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506315,
"published_at": "2026-08-15T05:58:55.023+00:00"
}