CVE-2026-63865

A flaw was found in the Linux kernel. The Berkeley Packet Filter BPF Linux Security Modules LSM feature incorrectly registered certain hooks, tasktoinode and inetconnestablished, as available for sleepable programs. These hooks are invoked in critical system contexts where program sleeping is not...

CVE-2026-63865

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop tasktoinode and inetconnestablished from lsm sleepable hooks bpflsmtasktoinode is called under rcureadlock and bpflsminetconnestablished is called from softirq context, so neither hook can be used by sleepable LSM...

CVE-2026-63865

Technical details are not publicly available in the provided documents. Monitor for updates from vendors and security advisories to obtain affected products, impact, and remediation.

EUVD-2026-45549

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop tasktoinode and inetconnestablished from lsm sleepable hooks bpflsmtasktoinode is called under rcureadlock and bpflsminetconnestablished is called from softirq context, so neither hook can be used by sleepable LSM...

CVE-2026-63865 bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop tasktoinode and inetconnestablished from lsm sleepable hooks bpflsmtasktoinode is called under rcureadlock and bpflsminetconnestablished is called from softirq context, so neither hook can be used by sleepable LSM...

PT-2026-61182

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description Certain sleepable LSM Linux Security Module programs cannot be used with the bpf lsm task to inode function because it is called under rcu read lock, and the bpf lsm inet conn establishe...

kernel: mptcp: fix slab-use-after-free in __inet_lookup_established

A flaw was found in the Linux kernel's Multipath TCP MPTCP implementation. Due to incorrect memory allocation for IPv6 subflow child sockets, a use-after-free vulnerability exists. A remote attacker could exploit this by triggering concurrent lookups in the kernel's hash table, potentially leadin...

kernel: mptcp: fix slab-use-after-free in __inet_lookup_established

A flaw was found in the Linux kernel's Multipath TCP MPTCP implementation. Due to incorrect memory allocation for IPv6 subflow child sockets, a use-after-free vulnerability exists. A remote attacker could exploit this by triggering concurrent lookups in the kernel's hash table, potentially leadin...

RLSA-2026:27789 Important: kernel security, bug fix, and enhancement update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: can: isotp: fix tx.buf use-after-free in isotpsendmsg CVE-2026-31474 kernel: mptcp: fix slab-use-after-free in inetlookupestablished CVE-2026-31669 kernel: xen/privcmd: fix double free vi...

RockyLinux 9 : kernel (RLSA-2026:27789)

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:27789 advisory. kernel: can: isotp: fix tx.buf use-after-free in isotpsendmsg CVE-2026-31474 kernel: mptcp: fix slab-use-after-free in inetlookupestablished...

CVE-2026-53034 bpf, sockmap: Fix af_unix null-ptr-deref in proto update

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix afunix null-ptr-deref in proto update unixstreamconnect sets skstate WRITEONCEsk-skstate, TCPESTABLISHED before it assigns a peer unixpeersk = newsk. skstate == TCPESTABLISHED makes sockmapskstateallowed believe...

Astra Linux – Vulnerability found in Linux 6.12, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: vsock: Ignore signals/timesouts on connect if the socket is already established. During connect, acting on a signal/timesout by disconnecting an already established socket leads to several issues: 1. connect invokes...

PT-2026-51927

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A race condition exists in the unix stream bpf update proto function within the Linux kernel's sockmap functionality. This issue occurs when a BPF Berkeley Packet Filter iterator program...

kernel: mptcp: fix slab-use-after-free in __inet_lookup_established

A flaw was found in the Linux kernel's Multipath TCP MPTCP implementation. Due to incorrect memory allocation for IPv6 subflow child sockets, a use-after-free vulnerability exists. A remote attacker could exploit this by triggering concurrent lookups in the kernel's hash table, potentially leadin...

GHSA-VCGP-9326-PQCP net-imap vulnerable to STARTTLS stripping via invalid response timing

Summary A man-in-the-middle attacker can cause Net::IMAPstarttls to return "successfully", without starting TLS. Details When using Net::IMAPstarttls to upgrade a plaintext connection to use TLS, a man-in-the-middle attacker can inject a tagged OK response with an easily predictable tag. By sendi...

mptcp: fix slab-use-after-free in __inet_lookup_established

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OESA-2026-2076 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcpsksk-fastopenrsk in tcpdisconnect. syzbot reported the splat below where a socket had tcpsksk-fastopenrsk in the TCPESTABLISHED state. 0 syzbot...

DEBIAN-CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

EUVD-2026-23950

Potential read out of bounds case with wolfSSHd on Windows while handling a terminal resize request. An authenticated user could trigger the out of bounds read after establishing a connection which would leak the adjacent stack memory to the pseudo-console output...

CVE-2026-4247 TCP: remotely exploitable DoS vector (mbuf leak)

When a challenge ACK is to be sent tcprespond constructs and sends the challenge ACK and consumes the mbuf that is passed in. When no challenge ACK should be sent the function returns and leaks the mbuf. If an attacker is either on path with an established TCP connection, or can themselves...