ext4: fix memory leak in ext4_ext_shift_extents()
Priority LOW 24CWE-401Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-401.
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_ext_shift_extents() In ext4_ext_shift_extents(), if the extent is NULL in the while loop, the function returns immediately without releasing the path obtained via ext4_find_extent(), leading to a memory leak. Fix this by jumping to the out label to ensure the path is properly released.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0016 5th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.252, 5.15.202, 6.1.165 +5Red Hat: 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.15 and later | 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 3.15 and later Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.15.1 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:-:*:*:*:*:*:* | 3.15 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc3:*:*:*:*:*:* | 3.15 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc4:*:*:*:*:*:* | 3.15 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc5:*:*:*:*:*:* | 3.15 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc6:*:*:*:*:*:* | 3.15 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc7:*:*:*:*:*:* | 3.15 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.15:rc8:*:*:*:*:*:* | 3.15 rc8 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.15.1 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:-:*:*:*:*:*:* Versions 3.15 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc3:*:*:*:*:*:* Versions 3.15 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc4:*:*:*:*:*:* Versions 3.15 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc5:*:*:*:*:*:* Versions 3.15 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc6:*:*:*:*:*:* Versions 3.15 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc7:*:*:*:*:*:* Versions 3.15 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.15:rc8:*:*:*:*:*:* Versions 3.15 rc8 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-45948
- 2026-10-03 Alias added: GHSA-gvfq-9hrf-2536
- 2026-11-06 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/7e807cb8603b7664fa630a696cd891d9a03c248d
- https://git.kernel.org/stable/c/afc5e61e1a07b2b833bd72cbee36ecce9cd901e2
- https://git.kernel.org/stable/c/1bce219ee5512cf179ba40cf114945a14a16e21f
- https://git.kernel.org/stable/c/4a79fde8db7eba7f1128d971ceba4e3c9ac84aec
- https://git.kernel.org/stable/c/2f4b1052246ca646bb17bfe0f53df2fdf9729b58
- https://git.kernel.org/stable/c/12615ab4bfb69678e5d961b28bb70040299e51b1
- https://git.kernel.org/stable/c/bd7b52557e4a3ccd7595fdb3a585f1257de57935
- https://git.kernel.org/stable/c/ca81109d4a8f192dc1cbad4a1ee25246363c2833
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-45948 · CVE Program
- CVE-2026-45948 · NVD
- FIRST EPSS
- GHSA-gvfq-9hrf-2536 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-45948 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences