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CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: free mapping node on duplicate reloc root insert __add_reloc_root() allocates a mapping_node before inserting it into rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it returns the existing rb_node and leaves the newly allocated node unlinked. The error path then returns -EEXIST without freeing the new node. Since the node was never inserted into reloc_root_tree, the later cleanup in put_reloc_control() cannot find it either. Free the newly allocated node before returning -EEXIST. The callers currently assert that -EEXIST should not happen, so this is a defensive cleanup for an unexpected duplicate insert path. If the path is ever reached, the local allocation should still be released.

Details
INFO

Published Date :

Aug. 12, 2026, 1:17 a.m.

Last Modified :

Aug. 19, 2026, 5:20 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-68450 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Ensure memory is freed in error paths to prevent leaks and potential corruption.
  • Free allocated mapping_node in the error path.
  • Apply the kernel patch to fix the memory leak.
  • Update the Linux kernel to the latest version.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-68450.

URL Resource
https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43
https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33
https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872
https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151
https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc
https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad
https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-68450 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-68450 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-68450 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-68450 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 19, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33
    Added Reference https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '92bedc0455552b42ada1a1f42b0e3a8593cdfccc', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '14a8be9428435ee17f17fae7991215c246b7fd43', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '797dc567146c7e3c4f8d9680e4fbc76e0a6d9151', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'ae0629ff9ccb836416ada129f4edc7efea6eaaad', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '6a8269b6459ed870a8156c106a0f597383907872', 'versionType': 'git'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '29d9746812d8b7c37d594f484e994fd552c3ec33', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '92bedc0455552b42ada1a1f42b0e3a8593cdfccc', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '14a8be9428435ee17f17fae7991215c246b7fd43', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '797dc567146c7e3c4f8d9680e4fbc76e0a6d9151', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'ae0629ff9ccb836416ada129f4edc7efea6eaaad', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '6a8269b6459ed870a8156c106a0f597383907872', 'versionType': 'git'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'affected'}]
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '92bedc0455552b42ada1a1f42b0e3a8593cdfccc', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '14a8be9428435ee17f17fae7991215c246b7fd43', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '797dc567146c7e3c4f8d9680e4fbc76e0a6d9151', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'ae0629ff9ccb836416ada129f4edc7efea6eaaad', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '6a8269b6459ed870a8156c106a0f597383907872', 'versionType': 'git'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '92bedc0455552b42ada1a1f42b0e3a8593cdfccc', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '14a8be9428435ee17f17fae7991215c246b7fd43', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '797dc567146c7e3c4f8d9680e4fbc76e0a6d9151', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'ae0629ff9ccb836416ada129f4edc7efea6eaaad', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '6a8269b6459ed870a8156c106a0f597383907872', 'versionType': 'git'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 12, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '92bedc0455552b42ada1a1f42b0e3a8593cdfccc', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '14a8be9428435ee17f17fae7991215c246b7fd43', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '797dc567146c7e3c4f8d9680e4fbc76e0a6d9151', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': 'ae0629ff9ccb836416ada129f4edc7efea6eaaad', 'versionType': 'git'}, {'status': 'affected', 'version': '57a304cfd43b2b4a5b44b8f5dc026abb34183068', 'lessThan': '6a8269b6459ed870a8156c106a0f597383907872', 'versionType': 'git'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/btrfs/relocation.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: btrfs: free mapping node on duplicate reloc root insert __add_reloc_root() allocates a mapping_node before inserting it into rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it returns the existing rb_node and leaves the newly allocated node unlinked. The error path then returns -EEXIST without freeing the new node. Since the node was never inserted into reloc_root_tree, the later cleanup in put_reloc_control() cannot find it either. Free the newly allocated node before returning -EEXIST. The callers currently assert that -EEXIST should not happen, so this is a defensive cleanup for an unexpected duplicate insert path. If the path is ever reached, the local allocation should still be released.
    Added Reference https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43
    Added Reference https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872
    Added Reference https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151
    Added Reference https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc
    Added Reference https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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