CVE-2026-43163 (GCVE-0-2026-43163)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:18
VLAI
Title
md/bitmap: fix GPF in write_page caused by resize race
Summary
In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over `bitmap->storage.filemap` without locking, while the resize path frees that storage via md_bitmap_file_unmap(). `quiesce()` does not stop the md thread, allowing concurrent access to freed pages. Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < 140cc839fbeb1ddb33a8da8811b716d88d3905b7 (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8 (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < d3af62411e19752c663fe4f424dbf49d95a4cc7c (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < d92b8fac294b5f915c50e65ce4ae2262e53614ec (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < a437e3bf30e32846079e470c1ba5ee790bccdf89 (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < 9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < 5f73c8b33df9a605a591eab72d43a969600c1f8c (git)
Affected: d60b479d177a5735b6b4db6ee5280ef6653f50e7 , < 46ef85f854dfa9d5226b3c1c46493d79556c9589 (git)
Create a notification for this product.
Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/bitmap: fix GPF in write_page caused by resize race\n\nA General Protection Fault occurs in write_page() during array resize:\nRIP: 0010:write_page+0x22b/0x3c0 [md_mod]\n\nThis is a use-after-free race between bitmap_daemon_work() and\n__bitmap_resize(). The daemon iterates over `bitmap-\u003estorage.filemap`\nwithout locking, while the resize path frees that storage via\nmd_bitmap_file_unmap(). `quiesce()` does not stop the md thread,\nallowing concurrent access to freed pages.\n\nFix by holding `mddev-\u003ebitmap_info.mutex` during the bitmap update."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-17T16:42:08+00:00",
      "cve": "CVE-2026-43163",
      "id": "CVE-2026-43163",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:fixed": "2081",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: md/bitmap: fix GPF in write_page caused by resize race",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43163.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:12:42Z",
      "cve": "CVE-2026-43163",
      "id": "CVE-2026-43163",
      "initial_release_date": "2026-05-07T02:17:30Z",
      "product_status:known_affected": "289",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "116",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43163",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43163.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.