CVE-2024-44981

published 2024-09-04

CVE-2024-44981: In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask() UBSAN reports the…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

workqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask()

UBSAN reports the following 'subtraction overflow' error when booting
in a virtual machine on Android:

| Internal error: UBSAN: integer subtraction overflow: 00000000f2005515 [#1] PREEMPT SMP
| Modules linked in:
| CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.10.0-00006-g3cbe9e5abd46-dirty #4
| Hardware name: linux,dummy-virt (DT)
| pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
| pc : cancel_delayed_work+0x34/0x44
| lr : cancel_delayed_work+0x2c/0x44
| sp : ffff80008002ba60
| x29: ffff80008002ba60 x28: 0000000000000000 x27: 0000000000000000
| x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
| x23: 0000000000000000 x22: 0000000000000000 x21: ffff1f65014cd3c0
| x20: ffffc0e84c9d0da0 x19: ffffc0e84cab3558 x18: ffff800080009058
| x17: 00000000247ee1f8 x16: 00000000247ee1f8 x15: 00000000bdcb279d
| x14: 0000000000000001 x13: 0000000000000075 x12: 00000a0000000000
| x11: ffff1f6501499018 x10: 00984901651fffff x9 : ffff5e7cc35af000
| x8 : 0000000000000001 x7 : 3d4d455453595342 x6 : 000000004e514553
| x5 : ffff1f6501499265 x4 : ffff1f650ff60b10 x3 : 0000000000000620
| x2 : ffff80008002ba78 x1 : 0000000000000000 x0 : 0000000000000000
| Call trace:
| cancel_delayed_work+0x34/0x44
| deferred_probe_extend_timeout+0x20/0x70
| driver_register+0xa8/0x110
| __platform_driver_register+0x28/0x3c
| syscon_init+0x24/0x38
| do_one_initcall+0xe4/0x338
| do_initcall_level+0xac/0x178
| do_initcalls+0x5c/0xa0
| do_basic_setup+0x20/0x30
| kernel_init_freeable+0x8c/0xf8
| kernel_init+0x28/0x1b4
| ret_from_fork+0x10/0x20
| Code: f9000fbf 97fffa2f 39400268 37100048 (d42aa2a0)
| ---[ end trace 0000000000000000 ]---
| Kernel panic - not syncing: UBSAN: integer subtraction overflow: Fatal exception

This is due to shift_and_mask() using a signed immediate to construct
the mask and being called with a shift of 31 (WORK_OFFQ_POO

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.10.7-1 (forky)	linux 6.10.7-1 (forky)
linux	linux	—	—
linux	linux	>= 1211f3b21c2aa0d22d8d7f050e3a5930a91cd0e4 < 90a6a844b2d9927d192758438a4ada33d8cd9de5	90a6a844b2d9927d192758438a4ada33d8cd9de5
linux	linux	>= 1211f3b21c2aa0d22d8d7f050e3a5930a91cd0e4 < 38f7e14519d39cf524ddc02d4caee9b337dad703	38f7e14519d39cf524ddc02d4caee9b337dad703
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.10.7-1	6.10.7-1
linux	linux_kernel	>= 0 < 6.10.7-1	6.10.7-1
linux	linux_kernel	>= 6.10 < 6.10.7	6.10.7

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_oracle 9.1 CRITICAL

vendor_debian 5.5 LOW

vendor_redhat 5.5 MEDIUM

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CWE-190