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CVE-2026-43359

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix transaction abort on set received ioctl due to item overflow If the set received ioctl fails due to an item overflow when attempting to add the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction since we did some metadata updates before. This means that if a user calls this ioctl with the same received UUID field for a lot of subvolumes, we will hit the overflow, trigger the transaction abort and turn the filesystem into RO mode. A malicious user could exploit this, and this ioctl does not even requires that a user has admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume. Fix this by doing an early check for item overflow before starting a transaction. This is also race safe because we are holding the subvol_sem semaphore in exclusive (write) mode. A test case for fstests will follow soon.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-08 15:16:46.717000
Last modified
2026-11-06 16:18:36.503000
View original CVE JSON 
{
  "id": "CVE-2026-43359",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-08T15:16:46.717",
  "lastModified": "2026-11-06T16:18:36.503",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix transaction abort on set received ioctl due to item overflow\n\nIf the set received ioctl fails due to an item overflow when attempting to\nadd the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction\nsince we did some metadata updates before.\n\nThis means that if a user calls this ioctl with the same received UUID\nfield for a lot of subvolumes, we will hit the overflow, trigger the\ntransaction abort and turn the filesystem into RO mode. A malicious user\ncould exploit this, and this ioctl does not even requires that a user\nhas admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.\n\nFix this by doing an early check for item overflow before starting a\ntransaction. This is also race safe because we are holding the subvol_sem\nsemaphore in exclusive (write) mode.\n\nA test case for fstests will follow soon."
    }
  ],
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      "affectedData": [
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            "fs/btrfs/ioctl.c",
            "fs/btrfs/uuid-tree.c",
            "fs/btrfs/uuid-tree.h"
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  "metrics": {
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          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "CWE-191"
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