{"id":"CVE-2024-44981","summary":"workqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix UBSAN 'subtraction overflow' error in shift_and_mask()\n\nUBSAN reports the following 'subtraction overflow' error when booting\nin a virtual machine on Android:\n\n | Internal error: UBSAN: integer subtraction overflow: 00000000f2005515 [#1] PREEMPT SMP\n | Modules linked in:\n | CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.10.0-00006-g3cbe9e5abd46-dirty #4\n | Hardware name: linux,dummy-virt (DT)\n | pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n | pc : cancel_delayed_work+0x34/0x44\n | lr : cancel_delayed_work+0x2c/0x44\n | sp : ffff80008002ba60\n | x29: ffff80008002ba60 x28: 0000000000000000 x27: 0000000000000000\n | x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n | x23: 0000000000000000 x22: 0000000000000000 x21: ffff1f65014cd3c0\n | x20: ffffc0e84c9d0da0 x19: ffffc0e84cab3558 x18: ffff800080009058\n | x17: 00000000247ee1f8 x16: 00000000247ee1f8 x15: 00000000bdcb279d\n | x14: 0000000000000001 x13: 0000000000000075 x12: 00000a0000000000\n | x11: ffff1f6501499018 x10: 00984901651fffff x9 : ffff5e7cc35af000\n | x8 : 0000000000000001 x7 : 3d4d455453595342 x6 : 000000004e514553\n | x5 : ffff1f6501499265 x4 : ffff1f650ff60b10 x3 : 0000000000000620\n | x2 : ffff80008002ba78 x1 : 0000000000000000 x0 : 0000000000000000\n | Call trace:\n |  cancel_delayed_work+0x34/0x44\n |  deferred_probe_extend_timeout+0x20/0x70\n |  driver_register+0xa8/0x110\n |  __platform_driver_register+0x28/0x3c\n |  syscon_init+0x24/0x38\n |  do_one_initcall+0xe4/0x338\n |  do_initcall_level+0xac/0x178\n |  do_initcalls+0x5c/0xa0\n |  do_basic_setup+0x20/0x30\n |  kernel_init_freeable+0x8c/0xf8\n |  kernel_init+0x28/0x1b4\n |  ret_from_fork+0x10/0x20\n | Code: f9000fbf 97fffa2f 39400268 37100048 (d42aa2a0)\n | ---[ end trace 0000000000000000 ]---\n | Kernel panic - not syncing: UBSAN: integer subtraction overflow: Fatal exception\n\nThis is due to shift_and_mask() using a signed immediate to construct\nthe mask and being called with a shift of 31 (WORK_OFFQ_POOL_SHIFT) so\nthat it ends up decrementing from INT_MIN.\n\nUse an unsigned constant '1U' to generate the mask in shift_and_mask().","modified":"2026-04-02T12:18:35.233319Z","published":"2024-09-04T19:54:31.505Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44981.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/38f7e14519d39cf524ddc02d4caee9b337dad703"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90a6a844b2d9927d192758438a4ada33d8cd9de5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44981.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-44981"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1211f3b21c2aa0d22d8d7f050e3a5930a91cd0e4"},{"fixed":"90a6a844b2d9927d192758438a4ada33d8cd9de5"},{"fixed":"38f7e14519d39cf524ddc02d4caee9b337dad703"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44981.json"}}],"schema_version":"1.7.5"}