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Linux Kernel CVE-2026-72210

| EUVDEUVD-2026-58968 CRITICAL
2026-08-15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-hpv2-jq93-768m
Buffer Overflow Linux Red Hat Suse
Critical
Disputed · 9.8 Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Sources disagree (Medium–Critical)
Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.4 MEDIUM

Local mount-time parsing so AV:L; needs mount privilege (PR:L); a single-byte over-read yields at most limited info leak (C:L) or crash (A:L), no integrity impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 17, 2026 - 07:41 vuln.today
CVSS changed
Aug 17, 2026 - 06:22 NVD
9.8 (CRITICAL)
Patch available
Aug 15, 2026 - 07:20 EUVD
CVE Published
Aug 15, 2026 - 06:21 cve.org
CRITICAL 9.8
CVE Published
Aug 15, 2026 - 06:21 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

ntfs: fix off-by-one in mapping pairs decoding bounds checks

In ntfs_mapping_pairs_decompress(), attr_end points one byte past the end of the attribute record:

attr_end = (u8 *)attr + le32_to_cpu(attr->length);

The two bounds checks validating that mapping pair data bytes fit within the attribute use strict greater-than (>), which allows a one-byte out-of-bounds read when the data extends exactly to attr_end:

b = *buf & 0xf; if (b) { if (unlikely(buf + b > attr_end)) // off-by-one goto io_error; for (deltaxcn = (s8)buf[b--]; b; b--) deltaxcn = (deltaxcn << 8) + buf[b]; }

When buf + b == attr_end, the check evaluates to false and buf[b] reads one byte past the valid attribute boundary. The same pattern appears in the LCN delta bytes check.

Fix both checks to use >= so that buf[b] at exactly attr_end is correctly rejected as out of bounds.

AnalysisAI

Out-of-bounds read in the Linux kernel's NTFS driver (ntfs_mapping_pairs_decompress) lets a crafted NTFS attribute record trigger a one-byte read past the attribute boundary. It stems from off-by-one bounds checks that use strict greater-than instead of >=, so mapping-pair data extending exactly to attr_end passes validation and buf[b] reads one byte too far. No public exploit is identified at time of analysis, EPSS is low (0.20%), and it is not on CISA KEV; exploitation requires the kernel to parse an attacker-controlled NTFS volume.

Technical ContextAI

The bug lives in the kernel NTFS filesystem driver's run-list (mapping pairs) decoder, which reconstructs the LCN/VCN cluster runs describing where a non-resident attribute's data physically lives on disk. Each mapping-pair header byte encodes, in its low and high nibbles, how many following bytes hold the VCN delta and LCN delta; the decoder walks those bytes to accumulate signed deltas. attr_end is computed as attr + attr->length, i.e. one byte past the record, and the guards 'buf + b > attr_end' fail to reject the case buf + b == attr_end, permitting buf[b] to touch the byte at attr_end. This is a classic off-by-one (CWE-193) producing an out-of-bounds read (CWE-125); the input CWE field is N/A. It affects the in-kernel NTFS implementation rather than the older ntfs3/ntfs-3g FUSE stacks.

RemediationAI

Vendor-released patch: apply the upstream kernel commits 18760a74ef7c and bfe835e535fe, or update to a stable kernel that includes them (fixed on the 7.1.5 backport / 7.2-rc1 line) via your distribution's kernel update. If immediate patching is not possible, the most effective compensating control is to avoid parsing untrusted NTFS: unload or blacklist the legacy in-kernel ntfs module (modprobe -r ntfs / blacklist ntfs) where NTFS support is unused, and disable automatic mounting of removable media (e.g. udisks/autofs policies) so a crafted USB image cannot be mounted without operator action - the trade-off is loss of transparent removable-media support. Where NTFS read support is genuinely needed, prefer the maintained ntfs3 driver or userspace ntfs-3g and restrict mount privileges to trusted administrators. Reference commits: https://git.kernel.org/stable/c/18760a74ef7c28df93726445b5595162e62ed341 and https://git.kernel.org/stable/c/bfe835e535fe0aa5767fdd8116f62e835ba50b55.

Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Not-Affected

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CVE-2026-72210 vulnerability details – vuln.today
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