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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于btrfs在重复插入reloc root时未释放映射节点，可能导致内存泄漏。

AI Predicted 3.3 Difficulty: Hard EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 57a304cfd43b2b4a5b44b8f5dc026abb34183068< 29d9746812d8b7c37d594f484e994fd552c3ec33 affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8 affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< 92bedc0455552b42ada1a1f42b0e3a8593cdfccc affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< 14a8be9428435ee17f17fae7991215c246b7fd43 affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< ae0629ff9ccb836416ada129f4edc7efea6eaaad affected
57a304cfd43b2b4a5b44b8f5dc026abb34183068< 6a8269b6459ed870a8156c106a0f597383907872 affected
5.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-68450

Vulnerability Information
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Vulnerability Title
btrfs: free mapping node on duplicate reloc root insert
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于btrfs在重复插入reloc root时未释放映射节点，可能导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 57a304cfd43b2b4a5b44b8f5dc026abb34183068 ~ 29d9746812d8b7c37d594f484e994fd552c3ec33 -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-68450

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III. Intelligence Information for CVE-2026-68450

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Patches & Fixes for CVE-2026-68450 (6)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68431 9.1 CRITICAL ksmbd: validate minimum PDU size for transform requests
CVE-2026-68432 8.8 HIGH vxlan: require CAP_NET_ADMIN in the device netns for changelink
CVE-2026-68433 8.6 HIGH libceph: bound get_version reply decode to front len
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68445 7.8 HIGH drm/vc4: Prevent shader BO mappings from becoming writable
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup
CVE-2026-68434 serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68450

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