CyberSecBulletin
CVE-2026-53253NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-53253 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 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 0ef2ea86c82b2615902d085cd5a586fe9f58994f, 2b83afb19293e4de700edae306115f18966dc4f9, 691f14b6a48b637655755134f1e551c7c6fedc2e 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 0.27% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 0ef2ea86c82b2615902d085cd5a586fe9f58994f or 2b83afb19293e4de700edae306115f18966dc4f9 or 691f14b6a48b637655755134f1e551c7c6fedc2e or d76dec1a37122bc16d83d059c08c0512ea8de909, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.210 or 6.1.176 or 6.6.143 or 6.12.94, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 0ef2ea86c82b2615902d085cd5a586fe9f58994f; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 2b83afb19293e4de700edae306115f18966dc4f9; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 691f14b6a48b637655755134f1e551c7c6fedc2e; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, d76dec1a37122bc16d83d059c08c0512ea8de909; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, c893e17d2809ec9c4b3f1cdd5847cecbc27a311b; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, be837cd09897e9e6e1958174501d467bdcbcc2bc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 6770d3a8acdf9151769180cc3710346c4cfbe6f0; 2.6.120ef2ea86c82b2615902d085cd5a586fe9f58994f, 2b83afb19293e4de700edae306115f18966dc4f9, 691f14b6a48b637655755134f1e551c7c6fedc2e, d76dec1a37122bc16d83d059c08c0512ea8de909, c893e17d2809ec9c4b3f1cdd5847cecbc27a311b, be837cd09897e9e6e1958174501d467bdcbcc2bc
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel2.6.12.1 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, 6.12.94; 6.13 up to, but not including, 6.18.36; 6.19 up to, but not including, 7.0.13; 2.6.12; 7.15.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

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
LowSome restricted data 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:L/I:N/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: reject short frames before parsing A BNEP peer can send a short BNEP SDU. bnep_rx_frame() reads the packet type byte immediately and, for control packets, reads the control opcode and setup UUID-size byte before proving that those bytes are present. bnep_rx_control() also dereferences the control opcode without rejecting an empty control payload. Use skb_pull_data() for the fixed fields in bnep_rx_frame() so a NULL return gates each dereference. Split the control handler so the frame path can pass an opcode that has already been pulled, and keep the byte-buffer wrapper for extension control payloads. For BNEP_SETUP_CONN_REQ, name the UUID-size byte before pulling the setup payload. struct bnep_setup_conn_req carries destination and source service UUIDs after that byte, each uuid_size bytes, so the parser now documents that tuple explicitly instead of leaving the pull length as an opaque multiplication. Validation reproduced this kernel report: KASAN slab-out-of-bounds in bnep_rx_frame.isra.0+0x130c/0x1790 The buggy address belongs to the object at ffff88800c0f7908 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 1-byte region [ffff88800c0f7908, ffff88800c0f7909) Read of size 1 Call trace: dump_stack_lvl+0xb3/0x140 (?:?) print_address_description+0x57/0x3a0 (?:?) bnep_rx_frame+0x130c/0x1790 (net/bluetooth/bnep/core.c:306) print_report+0xb9/0x2b0 (?:?) __virt_addr_valid+0x1ba/0x3a0 (?:?) srso_alias_return_thunk+0x5/0xfbef5 (?:?) kasan_addr_to_slab+0x21/0x60 (?:?) kasan_report+0xe0/0x110 (?:?) process_one_work+0xfce/0x17e0 (kernel/workqueue.c:3200) worker_thread+0x65c/0xe40 (?:?) __kthread_parkme+0x184/0x230 (?:?) kthread+0x35e/0x470 (?:?) _raw_spin_unlock_irq+0x28/0x50 (?:?) ret_from_fork+0x586/0x870 (?:?) __switch_to+0x74f/0xdc0 (?:?) ret_from_fork_asm+0x1a/0x30 (?:?)

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.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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