Linux: Out-of-bounds Read
CVE-2026-64547 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.1 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 f42217fa7d535e9ec4151f7971f06f6ea65e850a, c087749815379e9af2fdbeb08bfc33870b103958, e4a87126c085b097d29e17e3b7647295bba8be7c 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 0.28% 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 f42217fa7d535e9ec4151f7971f06f6ea65e850a or c087749815379e9af2fdbeb08bfc33870b103958 or e4a87126c085b097d29e17e3b7647295bba8be7c or 685e92934f11d5e215dad58813e2f9955ac2f436, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.10.261 or 5.15.212 or 6.1.178 or 6.6.145, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, f42217fa7d535e9ec4151f7971f06f6ea65e850a; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, c087749815379e9af2fdbeb08bfc33870b103958; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, e4a87126c085b097d29e17e3b7647295bba8be7c; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, 685e92934f11d5e215dad58813e2f9955ac2f436; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, 4dc8484be3302d187274364820d3bef6c62bde32; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, b153cfe84b1340c69a13d0957665a2bfcf21239c; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, ea866cab12db1a2100b400a8b03569e5bc0ee29a; 904813cd8a0b334189da285bb05af0b18b062502 up to, but not including, 03f384bc0cb8d4a1301d4f5b0baef2d980258383; and 1 more ranges | f42217fa7d535e9ec4151f7971f06f6ea65e850a, c087749815379e9af2fdbeb08bfc33870b103958, e4a87126c085b097d29e17e3b7647295bba8be7c, 685e92934f11d5e215dad58813e2f9955ac2f436, 4dc8484be3302d187274364820d3bef6c62bde32, b153cfe84b1340c69a13d0957665a2bfcf21239c |
| Linux | Linux Kernel | 2.6.14 up to, but not including, 5.10.261; 5.11 up to, but not including, 5.15.212; 5.16 up to, but not including, 6.1.178; 6.2 up to, but not including, 6.6.145; 6.7 up to, but not including, 6.12.97; 6.13 up to, but not including, 6.18.40; 6.19 up to, but not including, 7.1.5; 7.2 | 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40 |
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
- NoneNothing can be modified.
- 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:N/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: net: usb: net1080: validate packet_len before pad-byte access in rx_fixup For an even packet_len, net1080_rx_fixup() reads the pad byte at skb->data[packet_len] before the skb->len != packet_len check further down, and packet_len is only bounded against NC_MAX_PACKET. A malicious NetChip 1080 device can send a short frame advertising a large even packet_len (e.g. 0x4000), so the pad-byte read lands past the end of the skb: BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14 ... net1080_rx_fixup (drivers/net/usb/net1080.c:384) usbnet_bh (drivers/net/usb/usbnet.c:1589) process_one_work (kernel/workqueue.c:3322) bh_worker (kernel/workqueue.c:3708) tasklet_action (kernel/softirq.c:965) handle_softirqs (kernel/softirq.c:622) ... Reject the frame when packet_len >= skb->len before reading.
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: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/03f384bc0cb8d4a1301d4f5b0baef2d980258383
- git.kernel.org/stable/c/4dc8484be3302d187274364820d3bef6c62bde32
- git.kernel.org/stable/c/685e92934f11d5e215dad58813e2f9955ac2f436
- git.kernel.org/stable/c/b153cfe84b1340c69a13d0957665a2bfcf21239c
- git.kernel.org/stable/c/c087749815379e9af2fdbeb08bfc33870b103958
- git.kernel.org/stable/c/e4a87126c085b097d29e17e3b7647295bba8be7c
- git.kernel.org/stable/c/ea866cab12db1a2100b400a8b03569e5bc0ee29a
- git.kernel.org/stable/c/f42217fa7d535e9ec4151f7971f06f6ea65e850a
Recent Out-of-bounds Read vulnerabilities
- 8.1 High severity
- 9.8 Critical severity
- 8.1 High severity
- 7.1 High severity
- 9.1 Critical severity
- 7.1 High severity
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