CVE - CVE-2024-42271

CVE-ID
CVE-2024-42271	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use after free in iucv_sock_close() iucv_sever_path() is called from process context and from bh context. iucv->path is used as indicator whether somebody else is taking care of severing the path (or it is already removed / never existed). This needs to be done with atomic compare and swap, otherwise there is a small window where iucv_sock_close() will try to work with a path that has already been severed and freed by iucv_callback_connrej() called by iucv_tasklet_fn(). Example: [452744.123844] Call Trace: [452744.123845] ([<0000001e87f03880>] 0x1e87f03880) [452744.123966] [<00000000d593001e>] iucv_path_sever+0x96/0x138 [452744.124330] [<000003ff801ddbca>] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336] [<000003ff801e01b6>] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [<000003ff801e08cc>] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] [<00000000d574794e>] __sock_release+0x5e/0xe8 [452744.124815] [<00000000d5747a0c>] sock_close+0x34/0x48 [452744.124820] [<00000000d5421642>] __fput+0xba/0x268 [452744.124826] [<00000000d51b382c>] task_work_run+0xbc/0xf0 [452744.124832] [<00000000d5145710>] do_notify_resume+0x88/0x90 [452744.124841] [<00000000d5978096>] system_call+0xe2/0x2c8 [452744.125319] Last Breaking-Event-Address: [452744.125321] [<00000000d5930018>] iucv_path_sever+0x90/0x138 [452744.125324] [452744.125325] Kernel panic - not syncing: Fatal exception in interrupt Note that bh_lock_sock() is not serializing the tasklet context against process context, because the check for sock_owned_by_user() and corresponding handling is missing. Ideas for a future clean-up patch: A) Correct usage of bh_lock_sock() in tasklet context, as described in Re-enqueue, if needed. This may require adding return values to the tasklet functions and thus changes to all users of iucv. B) Change iucv tasklet into worker and use only lock_sock() in af_iucv.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84 URL:https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84 MISC:https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0 URL:https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0 MISC:https://git.kernel.org/stable/c/69620522c48ce8215e5eb55ffbab8cafee8f407d URL:https://git.kernel.org/stable/c/69620522c48ce8215e5eb55ffbab8cafee8f407d MISC:https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01 URL:https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01 MISC:https://git.kernel.org/stable/c/8b424c9e44111c5a76f41c6b741f8d4c4179d876 URL:https://git.kernel.org/stable/c/8b424c9e44111c5a76f41c6b741f8d4c4179d876 MISC:https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5 URL:https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5 MISC:https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895 URL:https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895 MISC:https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431 URL:https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431
Assigning CNA
kernel.org
Date Record Created
20240730	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240730)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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