CVE-2026-23419

MEDIUM EPSS 7.2%
Published Apr 3, 20262mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: Fix circular locking dependency in rds_tcp_tune syzbot reported a circular locking dependency in rds_tcp_tune() where sk_net_refcnt_upgrade() is called while holding the socket lock: ====================================================== WARNING: possible circular locking dependency detected ====================================================== kworker/u10:8/15040 is trying to acquire lock: ffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x4b/0x6f0 but task is already holding lock: ffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_tune+0xd7/0x930 The issue occurs because sk_net_refcnt_upgrade() performs memory allocation (via get_net_track() -> ref_tracker_alloc()) while the socket lock is held, creating a circular dependency with fs_reclaim. Fix this by moving sk_net_refcnt_upgrade() outside the socket lock critical section. This is safe because the fields modified by the sk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not accessed by any concurrent code path at this point. v2: - Corrected fixes tag - check patch line wrap nits - ai commentary nits

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
7.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥5.17.7  –  <5.18
linuxlinux_kernel*≥5.18.1  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.77
linuxlinux_kernel*≥6.13  –  <6.18.17
linuxlinux_kernel*≥6.19  –  <6.19.7
linuxlinux_kernel5.18any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d
    Patch