Linux: Out-of-bounds Read
CVE-2026-63947 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions 1f08a90013e1e632b34321334e861fcefc056505, cc3832b19f863e3677c5651f001a2e3795f39eb8, d313683d6ccdd8c01e0562270a2ae25b86d8461d as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.35% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 1f08a90013e1e632b34321334e861fcefc056505 or cc3832b19f863e3677c5651f001a2e3795f39eb8 or d313683d6ccdd8c01e0562270a2ae25b86d8461d or d7d6a81b8dd1a8d084a1b755db9406041d53adb5, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.210 or 6.1.176 or 6.6.143 or 6.12.93, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 1f08a90013e1e632b34321334e861fcefc056505; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, cc3832b19f863e3677c5651f001a2e3795f39eb8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, d313683d6ccdd8c01e0562270a2ae25b86d8461d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, d7d6a81b8dd1a8d084a1b755db9406041d53adb5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 6348dfed5b0f9c6074f14322332e97493d32fef0; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, b83dcacd2ec7fcc5a48be215f82d573759f87ec2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6; 2.6.12 | 1f08a90013e1e632b34321334e861fcefc056505, cc3832b19f863e3677c5651f001a2e3795f39eb8, d313683d6ccdd8c01e0562270a2ae25b86d8461d, d7d6a81b8dd1a8d084a1b755db9406041d53adb5, 6348dfed5b0f9c6074f14322332e97493d32fef0, b83dcacd2ec7fcc5a48be215f82d573759f87ec2 |
| Linux | Linux Kernel | 2.6.12.1 up to, but not including, 5.15.210; 5.16 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.93; 6.13 up to, but not including, 6.18.35; 6.19 up to, but not including, 7.0.12; 2.6.12; 7.1 | 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- AdjacentThe attacker must be on the same local network segment.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: fix missing length checks in hidp_input_report() hidp_input_report() reads keyboard and mouse payload data from an skb without first verifying that skb->len contains enough data. hidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching to hidp_input_report(). If a paired device sends a truncated packet, the handler reads beyond the valid skb data, resulting in an out-of-bounds read of skb data. The OOB bytes may be interpreted as phantom key presses or spurious mouse movement. Replace the open-coded length tracking and pointer arithmetic with skb_pull_data() calls. skb_pull_data() returns NULL if the requested bytes are not present, eliminating the need for a manual size variable and the separate skb->len guard.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505
- git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6
- git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0
- git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2
- git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8
- git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d
- git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.8 High severity
- 7.3 High severity
- 7.1 High severity
- 7.8 High severity
- 9.8 Critical severity
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