high CVSS 7.8

CVE-2022-49044·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: dm integrity: fix memory corruption when tag_size is less than digest size It is possible to set up dm-integrity in such a way that the "tag_size" parameter is less than the actual digest size. In this situation, a part of the digest beyond tag_size is ignored. In this case, dm-integrity would write beyond the end of the ic->recalc_tags array and corrupt memory. The corruption happened in integrity_recalc->integrity_sector_checksum->crypto_shash_final. Fix this corruption by increasing the tags array so that it has enough padding at the end to accomodate the loop in integrity_recalc() being able to write a full digest size for the last member of the tags array.

Severity
high
Software
Kernel
Fixed in
5.17.4
Published
2025-02-26

Affected versions

From: 5.16

Until: 5.17.4

Fixed in: 5.17.4

How to fix this CVE

Update your Linux kernel to version 5.17.4 or later to resolve a memory corruption vulnerability in dm-integrity. This flaw occurs when the tag_size parameter is configured smaller than the digest size, causing writes beyond allocated buffer boundaries. Apply the security patch immediately to prevent potential system instability and data corruption on systems using dm-integrity with mismatched tag and digest sizes.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Run 'uname -r' to retrieve the currently installed kernel version and verify if it falls within the affected range (5.16.x to 5.17.3)
  2. Check if dm-integrity is active on your system by running 'sudo dmsetup table | grep integrity' or 'sudo lsmod | grep dm_integrity'
  3. If dm-integrity is in use, query the tag_size and digest_size configuration with 'sudo dmsetup status' and compare against the device's crypto algorithm digest length
  4. Verify the patch application by checking 'uname -r' returns 5.17.4 or later, and confirm no memory corruption symptoms in 'dmesg' logs after reboot

FAQ

What is CVE-2022-49044?

CVE-2022-49044 is a memory corruption vulnerability in the Linux kernel's dm-integrity subsystem that occurs when the tag_size configuration parameter is set smaller than the cryptographic digest size, allowing out-of-bounds writes to kernel memory.

Is CVE-2022-49044 being actively exploited?

No, CVE-2022-49044 is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available. However, the high CVSS score (7.8) warrants prompt patching.

What versions of Kernel are affected by CVE-2022-49044?

Linux kernel versions 5.16.0 through 5.17.3 are affected. Kernel 5.17.4 and later versions contain the fix.

How do I check if my server is vulnerable to CVE-2022-49044?

Run 'uname -r' to check your kernel version; if it shows 5.16.x or 5.17.0 through 5.17.3, then verify dm-integrity usage with 'sudo lsmod | grep dm_integrity' and 'sudo dmsetup table | grep integrity'.

Does Defensia detect CVE-2022-49044?

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-2022-49044 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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