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NVD / CVE Program· CNA Linux

CVE-2024-49983: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1b558006d98b7b0b730027be0ee98973dd10ee0d, 3ff710662e8d86a63a39b334e9ca0cb10e5c14b0, 5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95; Azure Linux 3.0 ARM 6.6.57.1-2; Azure Linux 3.0 x64 6.6.57.1-2.

Low priority for now. Upgrade to Linux Linux 1b558006d98b7b0b730027be0ee98973dd10ee0d, 3ff710662e8d86a63a39b334e9ca0cb10e5c14b0, 5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95; Azure Linux 3.0 ARM 6.6.57.1-2; Azure Linux 3.0 x64 6.6.57.1-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(), the 'ppath' is updated but it is the 'path' that is freed, thus potentially triggering a double-free in the following process: ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(&ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path) ---> path First freed *orig_path = path = NULL ---> null ppath kfree(path) ---> path double-free !!! So drop the unnecessary ppath and use path directly to avoid this problem. And use ext4_find_extent() directly to update path, avoiding unnecessary memory allocation and freeing. Also, propagate the error returned by ext4_find_extent() instead of using strange error codes.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 21, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 16th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.10 and later · before 5.10.227
  • linux linux kernel5.11 and later · before 5.15.168
  • linux linux kernel5.16 and later · before 6.1.113
  • linux linux kernel6.2 and later · before 6.6.55
  • linux linux kernel6.7 and later · before 6.10.14
  • linux linux kernel6.11 and later · before 6.11.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.10affected
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 8c26d9e53e5fbacda0732a577e97c5a5b7882aafaffected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before a34bed978364114390162c27e50fca50791c568daffected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 6367d3f04c69e2b8770b8137bd800e0784b0abbcaffected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 1b558006d98b7b0b730027be0ee98973dd10ee0daffected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 3ff710662e8d86a63a39b334e9ca0cb10e5c14b0affected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 63adc9016917e6970fb0104ee5fd6770f02b2d80affected · git
    • 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 and later · before 5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95affected · git
    • before 5.10not affected · semver
    • 5.10.227 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.115-16.1.115-1
Debian:13linuxbefore 6.11.4-16.11.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-49980Oct 21, 2024 · vrf: revert "vrf: Remove unnecessary RCU-bh critical section"
    22Monitor
  • ← EarlierCVE-2024-49981Oct 21, 2024 · media: venus: fix use after free bug in venus_remove due to race condition
    28Monitor
  • Later →CVE-2024-49984Oct 21, 2024 · drm/v3d: Prevent out of bounds access in performance query extensions
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1b558006d98b7b0b730027be0ee98973dd10ee0dVendor (CNA)
Linux Linux3ff710662e8d86a63a39b334e9ca0cb10e5c14b0Vendor (CNA)
Linux Linux5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95Vendor (CNA)
Linux Linux6367d3f04c69e2b8770b8137bd800e0784b0abbcVendor (CNA)
Linux Linux63adc9016917e6970fb0104ee5fd6770f02b2d80Vendor (CNA)
Linux Linux8c26d9e53e5fbacda0732a577e97c5a5b7882aafVendor (CNA)
Linux Linuxa34bed978364114390162c27e50fca50791c568dVendor (CNA)
Azure Linux 3.0 ARM6.6.57.1-2 · kernelMicrosoft (MSRC)
Azure Linux 3.0 x646.6.57.1-2 · kernelMicrosoft (MSRC)
debian:linux6.1.115-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-35814157 days apartswiotlb: Fix double-allocation of slots due to broken alignment handling
    35Monitor
  • CVE-2024-498530 days apartfirmware: arm_scmi: Fix double free in OPTEE transport
    31Monitor
  • CVE-2024-498820 days apartext4: fix double brelse() the buffer of the extents path
    31Monitor
  • CVE-2024-499890 days apartdrm/amd/display: fix double free issue during amdgpu module unload
    31Monitor
  • CVE-2024-500550 days apartdriver core: bus: Fix double free in driver API bus_register()
    31Monitor
  • CVE-2024-500717 days apartpinctrl: nuvoton: fix a double free in ma35_pinctrl_dt_node_to_map_func()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records