# CVE-2024-26871: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix NULL pointer dereference in f2fs_submi...

CVE-2024-26871 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26871, released April 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26871
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix NULL pointer dereference in f2fs_submit_page_write()  BUG: kernel NULL pointer dereference, address: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Call Trace: <TASK> ? show_regs+0x6e/0x80 ? __die+0x29/0x70 ? page_fault_oops+0x154/0x4a0 ? prb_read_valid+0x20/0x30 ? __irq_work_queue_local+0x39/0xd0 ? irq_work_queue+0x36/0x70 ? do_user_addr_fault+0x314/0x6c0 ? exc_page_fault+0x7d/0x190 ? asm_exc_page_fault+0x2b/0x30 ? f2fs_submit_page_write+0x6cf/0x780 [f2fs] ? f2fs_submit_page_write+0x736/0x780 [f2fs] do_write_page+0x50/0x170 [f2fs] f2fs_outplace_write_data+0x61/0xb0 [f2fs] f2fs_do_write_data_page+0x3f8/0x660 [f2fs] f2fs_write_single_data_page+0x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] ... It is possible that other threads have added this fio to io->bio and submitted the io->bio before entering f2fs_submit_page_write(). At this point io->bio = NULL. If is_end_zone_blkaddr(sbi, fio->new_blkaddr) of this fio is true, then an NULL pointer dereference error occurs at bio_get(io->bio). The original code for determining zone end was after "out:", which would have missed some fio who is zone end. I've moved  this code before "skip:" to make sure it's done for each fio.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-26871](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26871.md) | Apr 17, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-26871](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26871.md) | Apr 17, 2024 |

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