// For flags

CVE-2024-26871

f2fs: fix NULL pointer dereference in f2fs_submit_page_write()

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrige la desreferencia del puntero NULL en f2fs_submit_page_write() ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Seguimiento de llamadas: ? show_regs+0x6e/0x80? __morir+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+0 x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] .. Es posible que otros hilos hayan agregado este fio a io-&gt;bio y hayan enviado el io-&gt;bio antes de ingresar a f2fs_submit_page_write(). En este punto io-&gt;bio = NULL. Si is_end_zone_blkaddr(sbi, fio-&gt;new_blkaddr) de este fio es verdadero, entonces se produce un error de desreferencia de puntero NULL en bio_get(io-&gt;bio). El código original para determinar el final de la zona estaba después de "out:", lo que habría pasado por alto a algún fio que es el final de la zona. Moví este código antes de "omitir:" para asegurarme de que esté hecho para cada fio.

*Credits: N/A
CVSS Scores
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Attack Complexity
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Scope
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Confidentiality
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Integrity
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Availability
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* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-19 CVE Reserved
  • 2024-04-17 CVE Published
  • 2024-04-18 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.5 < 6.6.23
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.5 < 6.6.23"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.5 < 6.7.11
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.5 < 6.7.11"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.5 < 6.8.2
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.5 < 6.8.2"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.5 < 6.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.5 < 6.9"
en
Affected