cbcvebase.
CVE-2024-42271
published 2024-08-17

CVE-2024-42271: 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…

PriorityP339high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.24%
14.6th percentile
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] ([] 0x1e87f03880) [452744.123966] [] iucv_path_sever+0x96/0x138 [452744.124330] [] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336] [] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] [] __sock_release+0x5e/0xe8 [452744.124815] [] sock_close+0x34/0x48 [452744.124820] [] __fput+0xba/0x268 [452744.124826] [] task_work_run+0xbc/0xf0 [452744.124832] [] do_notify_resume+0x88/0x90 [452744.124841] [] system_call+0xe2/0x2c8 [452744.125319] Last Breaking-Event-Address: [452744.125321] [] 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.

Affected

35 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.106-1 (bookworm)linux 6.1.106-1 (bookworm)
debianlinux-6.1< linux 6.1.106-1 (bookworm)linux 6.1.106-1 (bookworm)
linuxlinux
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < 84f40b46787ecb67c7ad08a5bb1376141fa10c0184f40b46787ecb67c7ad08a5bb1376141fa10c01
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < 37652fbef9809411cea55ea5fa1a170e299efcd037652fbef9809411cea55ea5fa1a170e299efcd0
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < c65f72eec60a34ace031426e04e9aff8e5f04895c65f72eec60a34ace031426e04e9aff8e5f04895
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < ac758e1f663fe9bc64f6b47212a2aa18697524f5ac758e1f663fe9bc64f6b47212a2aa18697524f5
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < 8b424c9e44111c5a76f41c6b741f8d4c4179d8768b424c9e44111c5a76f41c6b741f8d4c4179d876
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < 01437282fd3904810603f3dc98d2cac6b8b6fc8401437282fd3904810603f3dc98d2cac6b8b6fc84
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < 69620522c48ce8215e5eb55ffbab8cafee8f407d69620522c48ce8215e5eb55ffbab8cafee8f407d
linuxlinux>= 7d316b9453523498246e9e19a659c423d4c5081e < f558120cd709682b739207b48cf7479fd9568431f558120cd709682b739207b48cf7479fd9568431
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.1.106-16.1.106-1
linuxlinux_kernel>= 0 < 6.10.4-16.10.4-1
linuxlinux_kernel>= 0 < 6.10.4-16.10.4-1
linuxlinux_kernel>= 0 < 5.4.0-200.2205.4.0-200.220
linuxlinux_kernel>= 0 < 5.15.0-125.1355.15.0-125.135
linuxlinux_kernel>= 0 < 6.8.0-48.486.8.0-48.48
linuxlinux_kernel>= 0 < 4.4.0-260.2944.4.0-260.294
linuxlinux_kernel>= 0 < 4.15.0-230.2424.15.0-230.242
linuxlinux_kernel>= 3.4 < 4.19.3204.19.320
linuxlinux_kernel>= 4.20 < 5.4.2825.4.282
linuxlinux_kernel>= 5.11 < 5.15.1655.15.165
linuxlinux_kernel>= 5.16 < 6.1.1046.1.104
linuxlinux_kernel>= 5.5 < 5.10.2245.10.224

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.8HIGH
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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