CVE-2026-53355 — net: rds: clear i_sends on setup unwind
In the Linux kernel, the following vulnerability has been resolved: net: rds: clear i_sends on setup unwind The RDS IB connection teardown path is written so it can run during partial startup and on repeated shutdown attempts. It uses NULL pointers to distinguish resources that are still owned from resources that have already been released. When rds_ib_setup_qp() fails after allocating i_sends but before allocating i_recvs, the sends_out path frees i_sends without clearing the pointer. A later shutdown pass can still treat that stale pointer as a live send ring allocation. Clear i_sends after vfree() in the error unwind path so the existing shutdown logic continues to use the correct ownership state.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.4% (30-day exploitation probability)+5
- 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.
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 matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
version 4.11≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 66cccec111421a10efdc2c74499d15b93e7acae5≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 2c5e5e4a5970c41f16e3ad801a78719ed5d5c71b≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 29d940026dce39e3018dab6f67c9427249321270≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < e7cf30aa5f1fc6c2a86df65df8b731df20e44d79≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < f16ad421a4e3e7db2d14bdf3b16f583bc4f3b30a≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 1d4ec754ee3871f7e3670c67bb0298c9c5760926≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 27040bbca289a704eafcacca167d310c6ce2b1bc and 9 more≥ 3b12f73a5c2977153f28a224392fd4729b50d1dc and < 20cf0fb715c41111469577e85e35d15f099473e0version 75a12b2fa80c2e4cc40a9f9305f95899850b7426version c9459693fae9a1bf3f51f3db98617f694112e897version 13099ee9c7d54b0a25f6c8397675aed99e9cfa45version 5c6712ab4efb6cf60e16719ab6bcaface9cc268c≥ 3.18.74 and < 3.19≥ 4.1.46 and < 4.2≥ 4.4.91 and < 4.5≥ 4.9.54 and < 4.10 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel |
version 7.1-rc3version 7.1-rc6version 7.1-rc5version 7.1-rc4≥ 6.19 and < 7.0.13≥ 4.1.46 and < 4.2≥ 4.4.91 and < 4.5≥ 4.9.54 and < 4.10 and 16 more≥ 4.11.1 and < 5.10.259≥ 5.11 and < 5.15.210≥ 5.16 and < 6.1.176≥ 6.2 and < 6.6.143≥ 6.7 and < 6.12.94≥ 6.13 and < 6.18.36≥ 3.18.74 and < 3.19version 4.11version 4.11-rc3version 4.11-rc4version 4.11-rc5version 4.11-rc6version 4.11-rc7version 4.11-rc8version 7.1-rc1version 7.1-rc2 |
Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
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 |
|---|---|---|---|---|---|
| 9.8 | CVSS 3.1 | Critical | 3.9 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 9.8 | 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:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.42%
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).
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- Record published
- Fix documented
- CVSS changed · 9.8
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
8 on the record
- git.kernel.org/stable/c/66cccec111421a10efdc2c74499d15b93e7acae5
- git.kernel.org/stable/c/f16ad421a4e3e7db2d14bdf3b16f583bc4f3b30a
- git.kernel.org/stable/c/e7cf30aa5f1fc6c2a86df65df8b731df20e44d79
- git.kernel.org/stable/c/27040bbca289a704eafcacca167d310c6ce2b1bc
- git.kernel.org/stable/c/29d940026dce39e3018dab6f67c9427249321270
- git.kernel.org/stable/c/20cf0fb715c41111469577e85e35d15f099473e0
- git.kernel.org/stable/c/2c5e5e4a5970c41f16e3ad801a78719ed5d5c71b
- git.kernel.org/stable/c/1d4ec754ee3871f7e3670c67bb0298c9c5760926
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 3d
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 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-2026-53355 is "net: rds: clear i_sends on setup unwind", 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 9.8 describes technical severity. EPSS 0.42% 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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