Out-of-bounds read in Linux kernel - CVE-2026-64496

Vulnerability identifier: #VU139440

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64496

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the iio event FIFO handling in drivers/iio/industrialio-event.c when reading from a newly created event file descriptor concurrently with FIFO reset. A local user can read from the file descriptor from another thread to disclose sensitive information.

Exploitation requires shared file descriptor table access between threads, creating a race window before the fd number is returned to userspace.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Anolis OS
openEuler
Ubuntu
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-devel
kernel-debug-core
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-doc
python3-perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-source
kernel-tools-debuginfo
kernel-tools-devel
perf-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - update to 4.18.0-553.154.1.el8_10
kernel-rt (Red Hat package) - update to 4.18.0-553.154.1.rt7.495.el8_10
kernel-devel - update to 4.18.0-553.154.1.0.1
kernel-debug-core - update to 4.18.0-553.154.1.0.1
kernel-debug - update to 4.18.0-553.154.1.0.1
kernel-cross-headers - update to 4.18.0-553.154.1.0.1
kernel-core - update to 4.18.0-553.154.1.0.1
kernel - update to 4.18.0-553.154.1.0.1
bpftool - update to 4.18.0-553.154.1.0.1
kernel-debug-devel - update to 4.18.0-553.154.1.0.1
kernel-debug-modules - update to 4.18.0-553.154.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.154.1.0.1
kernel-headers - update to 4.18.0-553.154.1.0.1
kernel-modules - update to 4.18.0-553.154.1.0.1
kernel-modules-extra - update to 4.18.0-553.154.1.0.1
kernel-tools - update to 4.18.0-553.154.1.0.1
kernel-tools-libs - update to 4.18.0-553.154.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.154.1.0.1
perf - update to 4.18.0-553.154.1.0.1
python3-perf - update to 4.18.0-553.154.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.154.1.0.1
kernel-doc - update to 4.18.0-553.154.1.0.1
bpftool - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
python3-perf - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
python3-perf-debuginfo - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-source - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
perf - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 5.10.0-327.0.0.228, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

• https://git.kernel.org/stable/c/0d4a646d7f87ea3625fafe387043fddc6a2f5e7f
• https://git.kernel.org/stable/c/72c6aa8e0d74eab91b8694cde97dec088c248fee
• https://git.kernel.org/stable/c/9dc84ba4be5bbeb29ee49efe6cea2cb32c461424
• https://git.kernel.org/stable/c/9edefd4c56bee3fe331e0355d1f10a533134999d
• https://git.kernel.org/stable/c/a13ef1adbc62085b21b546b07b0be7e2fbf52150
• https://git.kernel.org/stable/c/af791d295737ea6b6ff2c8d8488462a49c14af01
• https://git.kernel.org/stable/c/d16a702ca7d29c0b7a9b509339d1b044a1cadb32
• https://git.kernel.org/stable/c/f187dc5a4c4846ffa07d9bda6e760837ed005574

• Out-of-bounds read in Linux kernel iio driver
• openEuler 22.03 LTS SP4 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Anolis OS update for kernel:4.18
• openEuler 24.03 LTS SP3 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0