medium CVSS 6.3

CVE-2024-27032·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid potential panic during recovery During recovery, if FAULT_BLOCK is on, it is possible that f2fs_reserve_new_block() will return -ENOSPC during recovery, then it may trigger panic. Also, if fault injection rate is 1 and only FAULT_BLOCK fault type is on, it may encounter deadloop in loop of block reservation. Let's change as below to fix these issues: - remove bug_on() to avoid panic. - limit the loop count of block reservation to avoid potential deadloop.

Severity
medium
Software
Kernel
Fixed in
6.8.2
Published
2024-05-01

Affected versions

From: 6.8

Until: 6.8.2

Fixed in: 6.8.2

How to fix this CVE

Update your Linux kernel to version 6.8.2 or later to resolve this stability issue in the F2FS filesystem recovery mechanism. This patch removes unsafe panic conditions and adds safeguards against infinite loops during block reservation, preventing unintended system crashes during filesystem recovery operations. Apply kernel updates promptly, especially if your systems use F2FS and encounter recovery scenarios.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your kernel version with `uname -r` — vulnerable versions are 6.8.0 through 6.8.1
  2. Step 2: Verify F2FS usage by checking mounted filesystems with `mount | grep f2fs` — if F2FS partitions exist, the vulnerability applies
  3. Step 3: Search kernel logs for F2FS recovery panics using `sudo journalctl -k | grep -i 'f2fs\|panic\|ENOSPC'` to identify past exploitation
  4. Step 4: Confirm the patch by examining kernel source or release notes to verify that block reservation loop limits and panic removals are present in your installed kernel

FAQ

What is CVE-2024-27032?

This vulnerability affects the Linux kernel's F2FS filesystem recovery code, where unsafe fault injection handling can trigger panic conditions or infinite loops when block reservation fails during filesystem recovery operations.

Is CVE-2024-27032 being actively exploited?

No, this vulnerability is not listed as actively exploited in the CISA KEV catalog and no public exploits are available. However, it can be triggered through intentional fault injection or during legitimate recovery scenarios.

What versions of Kernel are affected by CVE-2024-27032?

Linux kernel versions 6.8.0 through 6.8.1 are affected. The vulnerability was resolved in kernel 6.8.2 and later.

How do I check if my server is vulnerable to CVE-2024-27032?

Run `uname -r` to check your kernel version — if it reports 6.8.0 or 6.8.1, you are vulnerable. Additionally, verify F2FS filesystem usage with `mount | grep f2fs`.

Does Defensia detect CVE-2024-27032?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server, CVE-2024-27032 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2026-64439CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: crypto: krb5 - filter out async aead implementations at alloc krb5_aead_encrypt(), krb5_aead_decrypt() in rfc3961_simplified.c and rfc8009_encrypt(), rfc8009_decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any negative return from crypto_aead_{encrypt,decrypt}() as terminal, falling through to kfree_sensitive(buffer). When the encrypt_name resolves to an async AEAD instance the request returns -EINPROGRESS, the buffer is freed while the backend's worker still holds a pointer, and the worker dereferences the freed slab on completion. KASAN report under UML+SLUB with a synthetic async aead backend bound to krb5->encrypt_name: BUG: KASAN: slab-use-after-free in t5_stub_complete+0x7d/0xc7 The helpers were written synchronously, so filter the async instances out at allocation time instead of plumbing crypto_wait_req() through every call site. Reachable via net/rxrpc/rxgk.c, fs/afs/cm_security.c and net/ceph/crypto.c on systems with an async AEAD provider bound to the krb5 enctype name.
CVE-2026-64066CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_to_pagecache() to pause on subreq failure Fix netfs_read_to_pagecache() so that it pauses the generation of new subrequests if an already-issued subrequest fails.
CVE-2026-64383CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.
CVE-2026-64067CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing barriers when accessing stream->subrequests locklessly The list of subrequests attached to stream->subrequests is accessed without locks by netfs_collect_read_results() and netfs_collect_write_results(), and then they access subreq->flags without taking a barrier after getting the subreq pointer from the list. Relatedly, the functions that build the list don't use any sort of write barrier when constructing the list to make sure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if no lock is taken. Fix this by: (1) Add a new list_add_tail_release() function that uses a release barrier to set the pointer to the new member of the list. (2) Add a new list_first_entry_or_null_acquire() function that uses an acquire barrier to read the pointer to the first member in a list (or return NULL). (3) Use list_add_tail_release() when adding a subreq to ->subrequests. (4) Use list_first_entry_or_null_acquire() when initially accessing the front of the list (when an item is removed, the pointer to the new front iterm is obtained under the same lock).

References

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