Critical

CVE-2026-53186 — Linux kernel RDMA/SRP out-of-bounds read via SRP_RSP sense data

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.

Published Jun 25, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.5% (30-day exploitation probability)+6
Technical severity (critical)+10

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.51%

ahead of 42% of scored CVEs · Oct 14, 2026

Affects

Linux

Linux and 1 more

CVSS base

9.1

Critical · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 2.6.15≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 13e91fd076306f5d0cdfa14f53d69e37274723c4≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 3523e53ff95f1837ec3f57ff7558532bcb2661b7≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < f92a285db7ff6e598591ccbfb551be155c5f4d57≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 2015038195939eac54a1ee83c9d98ef1a8ccbbce≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 0d64bc200ebe4f275b27438c6e593903e0b16fe1≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 0b9ee09d5e849591f17d98c078033dadea967293≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < ed77cc819ad631264787cade5ae5ec4c535ec6bb and 1 more ≥ aef9ec39c47f0cece886ddd6b53c440321e0b2a6 and < 3889517c2ec7f364914aea8209abfff735f7ecde	Vulnerable	CVE Program (cve.org) e CISA ADP
Linux	Linux Kernel	version 7.1-rc5version 7.1-rc7version 7.1-rc6≥ 2.6.15 and < 5.10.259version 7.1-rc4version 7.1-rc3version 7.1-rc2version 7.1-rc1 and 6 more ≥ 6.19 and < 7.0.13≥ 6.13 and < 6.18.36≥ 6.7 and < 6.12.94≥ 6.2 and < 6.6.143≥ 5.16 and < 6.1.176≥ 5.11 and < 5.15.210	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.1	CVSS 3.1	Critical	3.9	5.2	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
9.1	CVSS 3.1	Critical	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.51%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Analysis and videos

CVE-2026-53186: Linux kernel RDMA/SRP out-of-bounds read via SRP_RSP sense data
A flaw in the Linux kernel ib_srp initiator lets a malicious or compromised SRP target trigger a read past the receive buffer when processing SRP_RSP sense data. The record gives a CNA CVSS 3.1 base score of 9.1 and lists affected kernel ranges with upstream stable fixes. No confirmed exploitation appears in the sources consulted.

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 9.1
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jun 25, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

git.kernel.org/stable/c/3889517c2ec7f364914aea8209abfff735f7ecde
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/2015038195939eac54a1ee83c9d98ef1a8ccbbce
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/13e91fd076306f5d0cdfa14f53d69e37274723c4
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/0b9ee09d5e849591f17d98c078033dadea967293
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/ed77cc819ad631264787cade5ae5ec4c535ec6bb
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/0d64bc200ebe4f275b27438c6e593903e0b16fe1
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/3523e53ff95f1837ec3f57ff7558532bcb2661b7
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/f92a285db7ff6e598591ccbfb551be155c5f4d57
Patch, NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 8h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 8h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-53186 is "Linux kernel RDMA/SRP out-of-bounds read via SRP_RSP sense data", rated Critical. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.1 describes technical severity. EPSS 0.51% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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