CVE-2026-74376

Local denial of service via replacement-bio leak

Published Aug 15, 2026 · Updated Aug 15, 2026

Resource leak in the Linux kernel md/raid10 component allows local users to exhaust memory through RAID10 discard operations. The put_all_bios() cleanup skips bio_put() for devs[i].repl_bio when a reused r10bio retains a nonnegative read_slot from an earlier read. Reachability requires discard activity on an affected RAID10 array with a replacement bio; repeated leaks can destabilize or halt the host.

CVSS severity5.5
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel md/raid10 component allows local users to exhaust memory through RAID10 discard operations. The put_all_bios() cleanup skips bio_put() for devs[i].repl_bio when a reused r10bio retains a nonnegative read_slot from an earlier read. Reachability requires discard activity on an affected RAID10 array with a replacement bio; repeated leaks can destabilize or halt the host.

The record

CVE
CVE-2026-74376
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.13
  2. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <3cb2a606ce4902eceabe68338df0653312f861f8
  3. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <561c9711e4f545d6464a023168bdee03b00fa945
  4. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <6b8a26af065ddc93de2aa5c9f0df98dce9723442
  5. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <742e4afd247d9c972695227716b03d432a7e1d26
  6. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <b7313f23ea5a79b199a007bfad64a866cc2c22e7
  7. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <ce3030e92f14362880055de5fe3c258971118853
  8. Affected versionversion=d30588b2731fb01e1616cf16c3fe79a1443e29aa <eb04e3e9c14ed15914f5fd2eae8b6435f54f095f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <3cb2a606ce4902eceabe68338df0653312f861f8; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <561c9711e4f545d6464a023168bdee03b00fa945; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <6b8a26af065ddc93de2aa5c9f0df98dce9723442; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <742e4afd247d9c972695227716b03d432a7e1d26; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <b7313f23ea5a79b199a007bfad64a866cc2c22e7; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <ce3030e92f14362880055de5fe3c258971118853; version=d30588b2731fb01e1616cf16c3fe79a1443e29aa <eb04e3e9c14ed15914f5fd2eae8b6435f54f095f

Published CVSS scores

9.8CVE.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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