CVE-2024-26871: f2fs: fix NULL pointer dereference in f2fs_submit_page_write()
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix NULL pointer dereference in f2fssubmitpagewrite()
BUG: kernel NULL pointer dereference, address: 0000000000000014 RIP: 0010:f2fssubmitpagewrite+0x6cf/0x780 [f2fs] Call Trace: <TASK> ? showregs+0x6e/0x80 ? die+0x29/0x70 ? pagefaultoops+0x154/0x4a0 ? prbreadvalid+0x20/0x30 ? irqworkqueuelocal+0x39/0xd0 ? irqworkqueue+0x36/0x70 ? douseraddrfault+0x314/0x6c0 ? excpagefault+0x7d/0x190 ? asmexcpagefault+0x2b/0x30 ? f2fssubmitpagewrite+0x6cf/0x780 [f2fs] ? f2fssubmitpagewrite+0x736/0x780 [f2fs] dowritepage+0x50/0x170 [f2fs] f2fsoutplacewritedata+0x61/0xb0 [f2fs] f2fsdowritedatapage+0x3f8/0x660 [f2fs] f2fswritesingledatapage+0x5bb/0x7a0 [f2fs] f2fswritecachepages+0x3da/0xbe0 [f2fs] ... It is possible that other threads have added this fio to io->bio and submitted the io->bio before entering f2fssubmitpagewrite(). At this point io->bio = NULL. If isendzoneblkaddr(sbi, fio->newblkaddr) of this fio is true, then an NULL pointer dereference error occurs at bioget(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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-26871?
The severity of CVE-2024-26871 is classified as moderate due to the potential for kernel NULL pointer dereference, which can lead to system instability.
How do I fix CVE-2024-26871?
To fix CVE-2024-26871, upgrade to a patched version of the Linux kernel, specifically to versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.10-1, or 6.12.11-1.
Which versions of the Linux kernel are affected by CVE-2024-26871?
CVE-2024-26871 affects Linux kernel versions from 6.5 to 6.6.23, 6.7 to 6.7.11, and 6.8 to 6.8.2.
What does CVE-2024-26871 vulnerability involve?
CVE-2024-26871 involves a NULL pointer dereference in f2fs_submit_page_write, which can cause a kernel crash.
Is CVE-2024-26871 specific to any Linux distributions?
CVE-2024-26871 is found in the Linux kernel and may affect various distributions using the specified vulnerable versions.