What it is
CVE-2026-53362 is ipv6: account for fraggap on the paged allocation path affecting Linux Linux. In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2026-53362
ipv6: account for fraggap on the paged allocation path
Linux / Linux · affected before 14200d435af9a9eeb444f529fc2f689a236b7962
- Severity
- CVSS 7.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 0.3%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.
Who is affected?
Linux / Linux affected before 14200d435af9a9eeb444f529fc2f689a236b7962.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
ipv6: account for fraggap on the paged allocation path
In the Linux kernel, the following vulnerability has been resolved:
ipv6: account for fraggap on the paged allocation path
In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as
alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen;
datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info.
An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES.
The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable.
The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen.
After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.
Vendor
Product
Affected
Status
Linux
Linux
Before 14200d435af9a9eeb444f529fc2f689a236b7962
Affected
Linux
Linux
Before 65fb14cbebb0cd0eff903a22d33537ddc8b95769
Affected
Linux
Linux
Before 46f201f8b4c39633a1fa3dc12459f506d470993d
Affected
Linux
Linux
Before 6374fb9edf72c67a118a2c214a0dddd04c921e0a
Affected
Linux
Linux
Before e9eacf19281ea2498b36291b56c9606118c2d74e
Affected
Linux
Linux
Before 736b380e28d0480c7bc3e022f1950f31fe53a7c5
Affected
Linux
Linux
6.0
Affected
Linux
Linux
Before 6.0
Unaffected
Linux
Linux
Through 6.1.*
Unaffected
Linux
Linux
Through 6.6.*
Unaffected
Linux
Linux
Through 6.12.*
Unaffected
Linux
Linux
Through 6.18.*
Unaffected
Linux
Linux
Through 7.1.*
Unaffected
Linux
Linux
Through *
Unaffected
- Published
- 04 Jul 2026
- Exploitation Reported
- 27 Aug 2026
- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
linux
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-53362
- git.kernel.org/stable/c/14200d435af9a9eeb444f529fc2f689a236... git.kernel.org · CVE Record https://git.kernel.org/stable/c/14200d435af9a9eeb444f529fc2f689a236b7962
- git.kernel.org/stable/c/65fb14cbebb0cd0eff903a22d33537ddc8b... git.kernel.org · CVE Record https://git.kernel.org/stable/c/65fb14cbebb0cd0eff903a22d33537ddc8b95769
- git.kernel.org/stable/c/46f201f8b4c39633a1fa3dc12459f506d47... git.kernel.org · CVE Record https://git.kernel.org/stable/c/46f201f8b4c39633a1fa3dc12459f506d470993d
- git.kernel.org/stable/c/6374fb9edf72c67a118a2c214a0dddd04c9... git.kernel.org · CVE Record https://git.kernel.org/stable/c/6374fb9edf72c67a118a2c214a0dddd04c921e0a
- git.kernel.org/stable/c/e9eacf19281ea2498b36291b56c9606118c... git.kernel.org · CVE Record https://git.kernel.org/stable/c/e9eacf19281ea2498b36291b56c9606118c2d74e
- git.kernel.org/stable/c/736b380e28d0480c7bc3e022f1950f31fe5... git.kernel.org · CVE Record https://git.kernel.org/stable/c/736b380e28d0480c7bc3e022f1950f31fe53a7c5
Exploitation evidence
Why Previdian marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the Previdian record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2026-08-27 17:00 UTC |
| CVE | 2026-08-27 20:11 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
7.8
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
0.3%
Weaknesses
Timeline
From disclosure to observed exploitation
-
KEV confirmed by CVE
Exploitation attested by an external source
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-53362
Free JSON includes basic KEV fields{
"cve_id": "CVE-2026-53362",
"confidence": "Confirmed",
"cvss_score": 7.8,
"cvss_estimated": false,
"epss_score": 0.00265,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
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