In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix netfs_page_mkwrite() to check folio->mapping is valid
Fix netfs_page_mkwrite() to check that folio->mapping is valid once it has taken the folio lock (as filemap_page_mkwrite() does). Without this, generic/247 occasionally oopses with something like the following:
BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page
RIP: 0010:trace_event_raw_event_netfs_folio+0x61/0xc0 ... Call Trace: <TASK> ? __die_body+0x1a/0x60 ? page_fault_oops+0x6e/0xa0 ? exc_page_fault+0xc2/0xe0 ? asm_exc_page_fault+0x22/0x30 ? trace_event_raw_event_netfs_folio+0x61/0xc0 trace_netfs_folio+0x39/0x40 netfs_page_mkwrite+0x14c/0x1d0 do_page_mkwrite+0x50/0x90 do_pte_missing+0x184/0x200 __handle_mm_fault+0x42d/0x500 handle_mm_fault+0x121/0x1f0 do_user_addr_fault+0x23e/0x3c0 exc_page_fault+0xc2/0xe0 asm_exc_page_fault+0x22/0x30
This is due to the invalidate_inode_pages2_range() issued at the end of the DIO write interfering with the mmap'd writes.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1014-raspiUpgrade linux-image-lowlatencyUpgrade linux-image-genericUpgrade linux-image-6.8.0-1016-azure-fdeUpgrade linux-image-generic-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-48-lowlatencyUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-1017-gcpUpgrade linux-image-azure-fdeUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1015-oracle-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-gcpUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oem-24.04Upgrade linux-image-gkeopUpgrade linux-image-6.8.0-1016-azureUpgrade linux-image-oem-24.04aUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1017-nvidia-lowlatencyUpgrade linux-image-oem-22.04cUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1014-ibmUpgrade linux-image-oem-22.04dUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1017-nvidiaUpgrade linux-image-azureUpgrade linux-image-6.8.0-1016-oemUpgrade linux-image-6.8.0-1013-gkeUpgrade linux-image-6.8.0-48-lowlatency-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-1018-awsUpgrade linux-image-ibmUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1017-nvidia-64kUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1017-nvidia-lowlatency-64kUpgrade linux-image-virtualUpgrade linux-image-gkeop-6.8Upgrade linux-image-oracleUpgrade linux-image-lowlatency-64kUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1016-gcpUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1017-azure-fdeUpgrade linux-image-awsUpgrade linux-image-oem-22.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1002-gkeopUpgrade linux-image-gkeUpgrade linux-image-6.8.0-48-genericUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1017-azureUpgrade linux-image-6.8.0-1015-oracleUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-48-generic-64k | Nov 4, 2024 | Jul 29, 2024 |
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