CyberSecBulletin
CVE-2026-53186NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-53186 is a critical-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 3889517c2ec7f364914aea8209abfff735f7ecde, ed77cc819ad631264787cade5ae5ec4c535ec6bb, 0b9ee09d5e849591f17d98c078033dadea967293 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 0.51% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Linux to 3889517c2ec7f364914aea8209abfff735f7ecde or ed77cc819ad631264787cade5ae5ec4c535ec6bb or 0b9ee09d5e849591f17d98c078033dadea967293 or 0d64bc200ebe4f275b27438c6e593903e0b16fe1, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.259 or 5.15.210 or 6.1.176 or 6.6.143, whichever matches your release line, or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxaef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 3889517c2ec7f364914aea8209abfff735f7ecde; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, ed77cc819ad631264787cade5ae5ec4c535ec6bb; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 0b9ee09d5e849591f17d98c078033dadea967293; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 0d64bc200ebe4f275b27438c6e593903e0b16fe1; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 2015038195939eac54a1ee83c9d98ef1a8ccbbce; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, f92a285db7ff6e598591ccbfb551be155c5f4d57; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 3523e53ff95f1837ec3f57ff7558532bcb2661b7; aef9ec39c47f0cece886ddd6b53c440321e0b2a6 up to, but not including, 13e91fd076306f5d0cdfa14f53d69e37274723c4; and 1 more ranges3889517c2ec7f364914aea8209abfff735f7ecde, ed77cc819ad631264787cade5ae5ec4c535ec6bb, 0b9ee09d5e849591f17d98c078033dadea967293, 0d64bc200ebe4f275b27438c6e593903e0b16fe1, 2015038195939eac54a1ee83c9d98ef1a8ccbbce, f92a285db7ff6e598591ccbfb551be155c5f4d57
LinuxLinux Kernel2.6.15 up to, but not including, 5.10.259; 5.11 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; 7.15.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36

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
NetworkCan be exploited remotely over a network, including the internet.
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:N/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: RDMA/srp: bound SRP_RSP sense copy by the received length srp_process_rsp() copies sense data from rsp->data + resp_data_len, where resp_data_len is the full 32-bit value supplied by the SRP target and is never checked against the number of bytes actually received (wc->byte_len). The copy length is bounded to SCSI_SENSE_BUFFERSIZE, so at most 96 bytes are copied, but the source offset is not bounded. A malicious or compromised SRP target on the InfiniBand/RoCE fabric that the initiator has logged into can return an SRP_RSP with SRP_RSP_FLAG_SNSVALID set and a large resp_data_len. The receive buffer is allocated at the target-chosen max_ti_iu_len, so the source of the sense copy lands past the bytes actually received; with resp_data_len near 0xFFFFFFFF it is gigabytes past the buffer and the read faults. Copy the sense data only if it has not been truncated, that is, only if the response header, the response data, and the sense region fit within the bytes actually received; otherwise drop the sense and log. The in-tree iSER and NVMe-RDMA receive paths already bound their parse by wc->byte_len; this brings ib_srp into line with them.

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: yes, 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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