Linux Kernel up to 7.1.4 ntfs3 indx_insert_into_root to_move out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.48

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.1.4. The affected element is the function indx_insert_into_root of the component ntfs3. The manipulation of the argument to_move leads to out-of-bounds write. This vulnerability is listed as CVE-2026-72192. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been rated as very critical. This issue affects the function indx_insert_into_root of the component ntfs3. The manipulation of the argument to_move with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head indx_insert_into_root() promotes a full resident $INDEX_ROOT into $INDEX_ALLOCATION and copies all non-last resident root entries into a newly allocated INDEX_BUFFER via hdr_insert_head(). The source byte count 'to_move' is summed from the on-disk resident entry sizes and is independent of the destination buffer size, which comes from root->index_block_size (via indx->index_bits). A crafted NTFS image that keeps a valid, full resident root but shrinks root->index_block_size down to 512 after the root has been populated makes hdr_insert_head() memcpy attacker-controlled resident entry bytes past the end of the kmalloc(1u << indx->index_bits) allocation returned by indx_new(). For a 512-byte destination and a resident root whose non-last entries total 560 bytes, the memcpy overruns by 120 bytes and a following memmove extends the highest written offset to 136 bytes past the allocation. The overflow bytes are a direct copy of on-disk entries (via kmemdup), so they are fully attacker-controlled. The write is reachable from unprivileged open(O_CREAT) on a mounted crafted NTFS image: a single sufficiently long create in a directory whose resident root is already full forces root promotion and triggers the copy. This is a controlled out-of-bounds write of 120-136 bytes past a kmalloc(index_block_size) allocation, with attacker-controlled content. It is a bounded adjacent-heap corruption primitive; it is not an arbitrary-address write. Successful exploitation into a named victim object depends on the surrounding slab layout. Reject the copy at the sink. The destination's INDEX_HDR already reports hdr_total (the payload capacity of the new buffer) and hdr_used (the bytes already consumed by the terminal END entry installed by indx_new()); require that to_move fits in the remaining payload before calling hdr_insert_head(). On mismatch, fail with -EINVAL and mark the filesystem as having a detected on-disk inconsistency, which is the same behaviour as the surrounding validation in this function.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-72192 since 08/09/2026. The exploitation is known to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 0af83b8155cc848e9f5d2c36e20a70d024214649/cb3161deebcaf8d36d3115abf452c633f2180fc1/53c5f3b2da3774b41534728aba295c098c9efa19/194b00c99ba971fa7cf6acd747a36032c6de54eb/aaa1f956c0fc41089a4a534da7df91552a08a47c/d240f5f9d036b8180224954d9873f172b6be4dd8/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67 is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 0af83b8155cc848e9f5d2c36e20a70d024214649/cb3161deebcaf8d36d3115abf452c633f2180fc1/53c5f3b2da3774b41534728aba295c098c9efa19/194b00c99ba971fa7cf6acd747a36032c6de54eb/aaa1f956c0fc41089a4a534da7df91552a08a47c/d240f5f9d036b8180224954d9873f172b6be4dd8/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72192 (🔒)
GCVE (CVE): GCVE-0-2026-72192
GCVE (VulDB): GCVE-100-390473

Entryinfo

Created: 08/15/2026 11:42
Changes: 08/15/2026 11:42 (60)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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