CVE-2025-40309 — Expired Pointer Dereference in Linux

CWE-825 — Expired Pointer Dereference49 documents7 sources
Severity
7.8HIGHOSV
OSV3.2
No vector
EPSS
0.0%
top 86.67%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
LinuxLinux KernelDebian Linux+2 more
Timeline
PublishedDec 8
Latest updateApr 13

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix UAF on sco_conn_free BUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline] BUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline] BUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107 Write of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352 CPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted 6.17.0-rc5-g717368f83676 …

Affected Packages7 packages

▶Linuxlinux/linux_kernel6.13.0 — 6.17.8
▶Debianlinux/linux_kernel< 5.10.247-1+3
▶Ubuntulinux/linux_kernel< 5.15.0-173.183+2
▶CVEListV5linux/linuxe6720779ae612a14ac4ba7fe4fd5b27d900d932c — 391f83547b7b2c63e4b572ab838e10a06cfa4425+2

🔴Vulnerability Details

23
OSV
linux-raspi vulnerabilities↗2026-04-01
▶
OSV
linux-raspi, linux-raspi-realtime vulnerabilities↗2026-04-01
▶
OSV
linux-azure-6.8 vulnerabilities↗2026-03-25
▶
OSV
linux-azure vulnerabilities↗2026-03-25
▶
OSV
linux-intel-iot-realtime vulnerabilities↗2026-03-23
▶

📋Vendor Advisories

25
Ubuntu
Linux kernel (Azure) vulnerabilities↗2026-04-13
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-04-09
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-04-09
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2026-04-01
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2026-04-01
▶