dmaengine: idxd: Remove improper idxd_free
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.160, 6.6.107, 6.12.48, 6.15, 6.16.8
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Remove improper idxd_free The call to idxd_free() introduces a duplicate put_device() leading to a reference count underflow: refcount_t: underflow; use-after-free. WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... Call Trace: <TASK> idxd_remove+0xe4/0x120 [idxd] pci_device_remove+0x3f/0xb0 device_release_driver_internal+0x197/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x74/0xf0 pci_unregister_driver+0x2e/0xb0 idxd_exit_module+0x34/0x7a0 [idxd] __do_sys_delete_module.constprop.0+0x183/0x280 do_syscall_64+0x54/0xd70 entry_SYSCALL_64_after_hwframe+0x76/0x7e The idxd_unregister_devices() which is invoked at the very beginning of idxd_remove(), already takes care of the necessary put_device() through the following call path: idxd_unregister_devices() -> device_unregister() -> put_device() In addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may trigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is called immediately after, it can result in a use-after-free. Remove the improper idxd_free() to avoid both the refcount underflow and potential memory corruption during module unload.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 68ac5a01f635b3791196fd1c39bc48497252c36f · fixed in 24414bbcb37e1af95190af36c21ae51d497e1a9e; From d2d05fd0fc95c4defed6f7b87550e20e8baa1d97 · fixed in 0e95ee7f532b21206fe3f1c4054002b0d21e3b9c; From 21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7 · fixed in dd7a7e43269711d757fc260b0bbdf7138f75de11; From d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 · fixed in da4fbc1488a4cec6748da685181ee4449a878dac; From d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 · fixed in f41c538881eec4dcf5961a242097d447f848cda6; From 6.1.140 · fixed in 6.1.160; From 6.6.92 · fixed in 6.6.107; From 6.12.30 · fixed in 6.12.48; From 6.14.8 · fixed in 6.15
- Linux Linux
6.15
- KernelLinux
fixed in 6.1.160; From 6.2.0 · fixed in 6.6.107; From 6.7.0 · fixed in 6.12.48; From 6.13.0 · fixed in 6.16.8