In the Linux kernel, the following vulnerability has been resolved:
s390/mm: Fix in_atomic() handling in do_secure_storage_access()
Kernel user spaces accesses to not exported pages in atomic context incorrectly try to resolve the page fault. With debug options enabled call traces like this can be seen:
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1523 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 419074, name: qemu-system-s39 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<00000383ea47cfa2>] copy_page_from_iter_atomic+0xa2/0x8a0 CPU: 12 UID: 0 PID: 419074 Comm: qemu-system-s39 Tainted: G W 6.16.0-20250531.rc0.git0.69b3a602feac.63.fc42.s390x+debug #1 PREEMPT Tainted: [W]=WARN Hardware name: IBM 3931 A01 703 (LPAR) Call Trace: [<00000383e990d282>] dump_stack_lvl+0xa2/0xe8 [<00000383e99bf152>] __might_resched+0x292/0x2d0 [<00000383eaa7c374>] down_read+0x34/0x2d0 [<00000383e99432f8>] do_secure_storage_access+0x108/0x360 [<00000383eaa724b0>] __do_pgm_check+0x130/0x220 [<00000383eaa842e4>] pgm_check_handler+0x114/0x160 [<00000383ea47d028>] copy_page_from_iter_atomic+0x128/0x8a0 ([<00000383ea47d016>] copy_page_from_iter_atomic+0x116/0x8a0) [<00000383e9c45eae>] generic_perform_write+0x16e/0x310 [<00000383e9eb87f4>] ext4_buffered_write_iter+0x84/0x160 [<00000383e9da0de4>] vfs_write+0x1c4/0x460 [<00000383e9da123c>] ksys_write+0x7c/0x100 [<00000383eaa7284e>] __do_syscall+0x15e/0x280 [<00000383eaa8417e>] system_call+0x6e/0x90 INFO: lockdep is turned off.
It is not allowed to take the mmap_lock while in atomic context. Therefore handle such a secure storage access fault as if the accessed page is not mapped: the uaccess function will return -EFAULT, and the caller has to deal with this. Usually this means that the access is retried in process context, which allows to resolve the page fault (or in this case export the page).
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | No solution exists | Jul 28, 2025 | Jul 28, 2025 |
| Redhat_linux | — | No solution exists | Jul 31, 2025 | Jul 25, 2025 |
| Suse | — | Upgrade kernel-obs-qaUpgrade kernel-obs-buildUpgrade ocfs2-kmp-64kbUpgrade kernel-rt-vdsoUpgrade ocfs2-kmp-rtUpgrade kernel-docsUpgrade gfs2-kmp-64kbUpgrade kernel-zfcpdumpUpgrade kselftests-kmp-rtUpgrade dtb-broadcomUpgrade kernel-64kb-optionalUpgrade dtb-appleUpgrade dtb-marvellUpgrade dtb-apmUpgrade kernel-defaultUpgrade dtb-amlogicUpgrade kernel-default-livepatch-develUpgrade kselftests-kmp-defaultUpgrade kernel-default-extraUpgrade kernel-rt-livepatch-develUpgrade dtb-amdUpgrade dtb-nvidiaUpgrade kernel-kvmsmall-develUpgrade cluster-md-kmp-defaultUpgrade dtb-armUpgrade kernel-kvmsmall-vdsoUpgrade gfs2-kmp-rtUpgrade kernel-rt-optionalUpgrade dtb-socionextUpgrade dlm-kmp-defaultUpgrade kernel-docs-htmlUpgrade kernel-kvmsmallUpgrade kernel-macrosUpgrade dtb-renesasUpgrade kernel-default-livepatchUpgrade dtb-exynosUpgrade kernel-develUpgrade kernel-source-vanillaUpgrade dtb-allwinnerUpgrade kernel-sourceUpgrade kernel-64kb-develUpgrade dtb-lgUpgrade kselftests-kmp-64kbUpgrade dtb-freescaleUpgrade kernel-64kb-extraUpgrade kernel-rt-extraUpgrade dtb-mediatekUpgrade kernel-64kbUpgrade kernel-rt-livepatchUpgrade kernel-symsUpgrade kernel-rtUpgrade dlm-kmp-64kbUpgrade dtb-alteraUpgrade cluster-md-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-rt-develUpgrade kernel-default-optionalUpgrade kernel-default-develUpgrade dtb-qcomUpgrade dtb-amazonUpgrade cluster-md-kmp-64kbUpgrade dtb-hisiliconUpgrade gfs2-kmp-defaultUpgrade dtb-sprdUpgrade dtb-caviumUpgrade dlm-kmp-rtUpgrade kernel-default-vdsoUpgrade dtb-xilinxUpgrade dtb-rockchip | Dec 5, 2025 | Nov 6, 2025 |
| Ubuntu | — | Upgrade linux-image-6.14.0-1015-awsUpgrade linux-image-azure-nvidia-6.14Upgrade linux-image-oem-24.04Upgrade linux-image-genericUpgrade linux-image-oem-24.04aUpgrade linux-image-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-virtualUpgrade linux-image-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-64kUpgrade linux-image-oem-24.04cUpgrade linux-image-oracleUpgrade linux-image-6.14.0-1018-gcpUpgrade linux-image-generic-64k-6.14Upgrade linux-image-realtimeUpgrade linux-image-aws-64k-6.14Upgrade linux-image-oem-6.14Upgrade linux-image-6.14.0-1014-realtimeUpgrade linux-image-virtual-6.14Upgrade linux-image-6.14.0-1007-azure-nvidiaUpgrade linux-image-6.14.0-1015-aws-64kUpgrade linux-image-oem-24.04bUpgrade linux-image-raspi-6.14Upgrade linux-image-6.14.0-1015-oracleUpgrade linux-image-awsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.14.0-34-genericUpgrade linux-image-generic-6.14Upgrade linux-image-oracle-6.14Upgrade linux-image-6.14.0-1016-raspiUpgrade linux-image-azureUpgrade linux-image-gcp-64k-6.14Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.14.0-1018-gcp-64kUpgrade linux-image-azure-6.14Upgrade linux-image-aws-6.14Upgrade linux-image-gcp-6.14Upgrade linux-image-azure-nvidiaUpgrade linux-image-raspiUpgrade linux-image-6.14.0-34-generic-64kUpgrade linux-image-6.14.0-1014-azureUpgrade linux-image-gcp-64kUpgrade linux-image-6.14.0-1014-oemUpgrade linux-image-realtime-6.14Upgrade linux-image-oracle-64k-6.14Upgrade linux-image-6.14.0-1015-oracle-64k | Jul 31, 2025 | Jul 25, 2025 |
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