Answer in brief
CVE-2024-42271 records a High severity (CVSS 7.8) vulnerability in net/iucv: fix use after free in iucv_sock_close(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7d316b9453523498246e9e19a659c423d4c5081e <84f40b46787ecb67c7ad08a5bb1376141fa10c01 || >=7d316b9453523498246e9e19a659c423d4c5081e <37652fbef9809411cea55ea5fa1a170e299efcd0 || >=7d316b9453523498246e9e19a659c423d4c5081e <c65f72eec60a34ace031426e04e9aff8e5f04895 || >=7d316b9453523498246e9e19a659c423d4c5081e <ac758e1f663fe9bc64f6b47212a2aa18697524f5 || >=7d316b9453523498246e9e19a659c423d4c5081e <8b424c9e44111c5a76f41c6b741f8d4c4179d876 || >=7d316b9453523498246e9e19a659c423d4c5081e <01437282fd3904810603f3dc98d2cac6b8b6fc84 || >=7d316b9453523498246e9e19a659c423d4c5081e <69620522c48ce8215e5eb55ffbab8cafee8f407d || >=7d316b9453523498246e9e19a659c423d4c5081e <f558120cd709682b739207b48cf7479fd9568431 | 84f40b46787ecb67c7ad08a5bb1376141fa10c01, 37652fbef9809411cea55ea5fa1a170e299efcd0, c65f72eec60a34ace031426e04e9aff8e5f04895, ac758e1f663fe9bc64f6b47212a2aa18697524f5, 8b424c9e44111c5a76f41c6b741f8d4c4179d876, 01437282fd3904810603f3dc98d2cac6b8b6fc84, 69620522c48ce8215e5eb55ffbab8cafee8f407d, f558120cd709682b739207b48cf7479fd9568431 |
| Linux/Linuxgeneric | 3.4 | Not reported |
Published upstream
Aug 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.