Linux Kernel
CVE-2025-68357
Lifecycle Timeline
2DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
iomap: allocate s_dio_done_wq for async reads as well
Since commit 222f2c7c6d14 ("iomap: always run error completions in user context"), read error completions are deferred to s_dio_done_wq. This means the workqueue also needs to be allocated for async reads.
AnalysisAI
Linux kernel iomap subsystem fails to allocate the s_dio_done_wq workqueue for asynchronous read operations, causing read error completions deferred by commit 222f2c7c6d14 to lack proper execution context and potentially leading to information disclosure or system instability. The vulnerability affects Linux kernel versions where the read error completion deferral was implemented without corresponding workqueue allocation for async reads. With an EPSS score of 0.01% and no evidence of active exploitation, this is a low-probability but correctness-critical issue affecting async I/O error handling on affected kernel versions.
Technical ContextAI
The iomap (I/O mapping) subsystem in the Linux kernel handles direct I/O and memory-mapped I/O operations. Commit 222f2c7c6d14 introduced mandatory deferral of read error completions to a dedicated workqueue (s_dio_done_wq) to ensure error handlers run in proper user context rather than interrupt context. However, the workqueue allocation logic was conditional and only executed for write operations; async read paths were not guaranteed to have this workqueue initialized. When async read errors occur without the workqueue being allocated, error completion handlers may execute in incorrect context, potentially leading to incomplete error handling, information leaks, or kernel stability issues. The root cause is a resource allocation oversight rather than a logic flaw in error handling itself.
Affected ProductsAI
Linux kernel versions are affected from the point where commit 222f2c7c6d14 was merged through versions where the fix was not yet backported. Based on the upstream commit references provided (51297686e00f4d5d941b0f20f12b2f12879d753c, 7fd8720dff2d9c70cf5a1a13b7513af01952ec02, bfc717be833fd9ee41443fde2dea0352a7fca333, c67775cf0da2407f113c1229e350758f4dca0f51), multiple stable kernel series received backports. The vulnerability affects Linux distributions shipping affected kernel versions; specific product versions depend on distribution release dates and patch application. CPE data was not provided in the intelligence sources, preventing precise affected product enumeration. Kernel versions and distributions should be checked against the provided stable commits to determine exact impact.
RemediationAI
Upgrade to a Linux kernel version containing one of the upstream fixes referenced in the stable commits: 51297686e00f4d5d941b0f20f12b2f12879d753c, 7fd8720dff2d9c70cf5a1a13b7513af01952ec02, bfc717be833fd9ee41443fde2dea0352a7fca333, or c67775cf0da2407f113c1229e350758f4dca0f51. For distribution users, check your vendor's kernel security advisory for the patched kernel version in your series (e.g., RHEL, Ubuntu LTS, or Debian stable) and apply the update via your standard package management system. No workarounds are available for the underlying issue; workqueue allocation is mandatory for correct async read error handling. Prioritize patching on servers with high async I/O workloads (NVMe, high-speed storage) and distributed file systems, as these are most likely to trigger affected code paths.
More in Linux Kernel
View allLinux kernel contains a flaw known as 'Dirty Pipe' where improper pipe buffer flag initialization allows unprivileged lo
The overlayfs implementation in the linux (aka Linux kernel) package before 3.19.0-21.21 in Ubuntu through 15.04 does no
The packet_set_ring function in net/packet/af_packet.c in the Linux kernel through 4.10.6 does not properly validate cer
The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel through 4.4 allows local users to cause a denial
Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. Rated high severity (CVSS 7.0). Public ex
The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr op
The mem_write function in the Linux kernel before 3.2.2, when ASLR is disabled, does not properly check permissions when
The compat_sys_recvmmsg function in net/compat.c in the Linux kernel before 3.13.2, when CONFIG_X86_X32 is enabled, allo
Race condition in net/packet/af_packet.c in the Linux kernel through 4.8.12 allows local users to gain privileges or cau
The join_session_keyring function in security/keys/process_keys.c in the Linux kernel before 4.4.1 mishandles object ref
A remote code execution vulnerability in the Broadcom Wi-Fi firmware could enable a remote attacker to execute arbitrary
It was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the h
Same technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today