Live › vulnerability › CVE-2026-53362
Go to dashboardThe Linux kernel has an unspecified flaw in its IPv6 networking code that allows privilege escalation. CISA lists it as actively exploited, so an attacker with local code execution can gain root.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| linux kernel | vendor | >= 6.0, < 6.1.177 | 6.1.177 |
| linux kernel | vendor | >= 6.2, < 6.6.144 | 6.6.144 |
| linux kernel | vendor | >= 6.7, < 6.12.95 | 6.12.95 |
| linux kernel | vendor | >= 6.13, < 6.18.38 | 6.18.38 |
| linux kernel | vendor | >= 6.19, < 7.1.3 | 7.1.3 |
| siemens simatic s7-1500 tm mfp firmware | vendor | – | – |
| Linux Kernel | vendor | – | – |
uname -r to see the running kernel version, then compare it against the fixed kernel builds from your distribution's security advisory for CVE-2026-53362.
Install the kernel update from your distribution vendor (SUSE, Red Hat, or others named in the advisory) and reboot.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
This page as .md · .json · in your agent: get_signal("CVE-2026-53362")
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