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Linux Kernel CVE-2026-74563

| EUVDEUVD-2026-59628 HIGH
2026-08-15 Linux GHSA-29x7-mv82-cj8r
Information Disclosure Linux Red Hat Suse
7.8
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Race condition between rcu_read_unlock() and concurrent RTM_DELLINK requires timing precision, justifying AC:H over vendor-assigned AC:L; PR:L reflects bind() syscall requiring a standard user account.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 17, 2026 - 12:28 vuln.today
CVSS changed
Aug 17, 2026 - 06:22 NVD
7.8 (HIGH)
Patch available
Aug 15, 2026 - 13:04 EUVD
CVE Published
Aug 15, 2026 - 12:28 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 15, 2026 - 12:28 cve.org
HIGH 7.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()

rds_tcp_laddr_check() looks up a scoped IPv6 interface with dev_get_by_index_rcu(), drops the RCU read-side lock, and only then passes the bare struct net_device * into ipv6_chk_addr().

dev_get_by_index_rcu() only keeps the device alive within the same RCU read-side section. After rcu_read_unlock(), a concurrent RTM_DELLINK can free the net_device; ipv6_chk_addr() then dereferences the stale pointer in __ipv6_chk_addr_and_flags() (e.g. l3mdev_master_dev_rcu(dev)), reading freed memory.

Keep the RCU read-side lock held across the ipv6_chk_addr() call instead of dropping it right after the lookup, so the device cannot be freed while it is in use.

BUG: KASAN: slab-use-after-free in __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) Read of size 8 at addr ffff8880106ec000 by task exploit/153 Call Trace: ... kasan_report (mm/kasan/report.c:595) __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998) ipv6_chk_addr (net/ipv6/addrconf.c:2031 net/ipv6/addrconf.c:1972) rds_tcp_laddr_check (net/rds/tcp.c:370) rds_bind (net/rds/bind.c:248) __sys_bind (net/socket.c:1920) __x64_sys_bind (net/socket.c:1956) do_syscall_64 (arch/x86/entry/syscall_64.c:63) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

AnalysisAI

Use-after-free in the Linux kernel's RDS/TCP subsystem allows a local authenticated attacker to read freed kernel memory via a race condition in rds_tcp_laddr_check(), potentially enabling privilege escalation. The flaw is triggered through the bind() syscall when the RCU read lock is incorrectly released between a dev_get_by_index_rcu() lookup and a subsequent ipv6_chk_addr() call, creating a window for concurrent interface deletion to free the net_device struct. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Load or confirm rds_tcp module is active
Delivery
Open RDS socket, call bind() with scoped IPv6 address
Exploit
Trigger rds_tcp_laddr_check() RCU lock drop
Execution
Race concurrent RTM_DELLINK to free net_device
Persist
Dereference freed pointer in __ipv6_chk_addr_and_flags()
Impact
Read freed kernel slab memory
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Vulnerability AssessmentAI

Exploitation Exploitation requires a local user account with standard (low) privileges - PR:L per CVSS, consistent with the `bind()` syscall being accessible to any unprivileged socket-capable user. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.8 (High) with AV:L/AC:L/PR:L/UI:N is the vendor-assigned score, reflecting local exploitation by any low-privileged user without interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local user on a multi-tenant Linux system with RDS/TCP and IPv6 enabled creates an RDS socket and calls `bind()` targeting a scoped IPv6 address, triggering `rds_tcp_laddr_check()`. A second thread controlled by the attacker simultaneously issues a `RTM_DELLINK` netlink message to delete the IPv6-enabled network interface, winning the race window between the `rcu_read_unlock()` call and the subsequent `ipv6_chk_addr()` dereference. …
Remediation The vendor-released fix is available across multiple Linux stable branches. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and list all systems running Linux kernels with RDS/TCP enabled, noting which have multiple local users or shared access. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-74563 vulnerability details – vuln.today
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