# CVE-2024-41083: linux: In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix netfs_page_mkwrite() to check folio->...

CVE-2024-41083 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-41083, released July 29, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-41083
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.8-1 | [DEBIAN-CVE-2024-41083](https://patchblox.com/security/data/fix/linux/debian-cve-2024-41083.md) | Jul 29, 2024 |
| Linux | linux Debian 14 | 6.9.8-1 | [DEBIAN-CVE-2024-41083](https://patchblox.com/security/data/fix/linux/debian-cve-2024-41083.md) | Jul 29, 2024 |

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