ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
Priority LOW 34Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 19 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00314 24th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.19.308, 5.4.270, 5.10.211 +5Red Hat: 7 advisoriesRed Hat: 19 fixed, 3 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 | 3.12 and later | 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8 | Patch available | CNA |
- Linux VendorLinux Affected 3.12 and later Fixed in 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 4.19.308; 4.20 to before 5.4.270; 5.5 to before 5.10.211; 5.11 to before 5.15.150; 5.16 to before 6.1.80; 6.2 to before 6.6.19; 6.7 to before 6.7.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* | 6.8 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* | 6.8 rc2 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.19.308; 4.20 to before 5.4.270; 5.5 to before 5.10.211; 5.11 to before 5.15.150; 5.16 to before 6.1.80; 6.2 to before 6.6.19; 6.7 to before 6.7.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* Versions 6.8 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* Versions 6.8 rc2 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8
Red Hat 7 advisories
- RHSA-2024:6753 Released 2024-09-18 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.123.1.el8_6, kernel-4.18.0-372.123.1.el8_6, kernel-abi-stablelists-4.18.0-372.123.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.123.1.el8_6, kernel-4.18.0-372.123.1.el8_6, kernel-abi-stablelists-4.18.0-372.123.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.123.1.el8_6, kernel-4.18.0-372.123.1.el8_6, kernel-abi-stablelists-4.18.0-372.123.1.el8_6 +14
- RHSA-2024:5255 Released 2024-08-13 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-tools-libs-devel-4.18.0-477.67.1.el8_8
- Red Hat Enterprise Linux BaseOS EUS (v.8.8) bpftool-4.18.0-477.67.1.el8_8, kernel-4.18.0-477.67.1.el8_8, kernel-abi-stablelists-4.18.0-477.67.1.el8_8 +19
- RHSA-2024:5101 Released 2024-08-08 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.16.1.el8_10, kernel-4.18.0-553.16.1.el8_10, kernel-abi-stablelists-4.18.0-553.16.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.16.1.el8_10
Show 4 more Red Hat advisories
- RHSA-2024:5102 Released 2024-08-08 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-4.18.0-553.16.1.rt7.357.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-4.18.0-553.16.1.rt7.357.el8_10 +7
- RHSA-2024:4928 Released 2024-07-31 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-427.28.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.28.1.el9_4, kernel-64k-devel-5.14.0-427.28.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.3.0-427.28.1.el9_4, kernel-5.14.0-427.28.1.el9_4, kernel-64k-5.14.0-427.28.1.el9_4 +29
- Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-427.28.1.el9_4, libperf-5.14.0-427.28.1.el9_4
- Red Hat Enterprise Linux NFV (v. 9) kernel-rt-5.14.0-427.28.1.el9_4, kernel-rt-core-5.14.0-427.28.1.el9_4, kernel-rt-debug-5.14.0-427.28.1.el9_4 +11
- Red Hat Enterprise Linux RT (v. 9) kernel-rt-5.14.0-427.28.1.el9_4, kernel-rt-core-5.14.0-427.28.1.el9_4, kernel-rt-debug-5.14.0-427.28.1.el9_4 +9
- RHSA-2024:4831 Released 2024-07-24 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt-5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core-5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-5.14.0-284.75.1.rt14.360.el9_2 +9
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt-5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core-5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-5.14.0-284.75.1.rt14.360.el9_2 +11
- RHSA-2024:4823 Released 2024-07-24 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-tools-libs-devel-5.14.0-284.75.1.el9_2
- Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-64k-debug-devel-5.14.0-284.75.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.75.1.el9_2, kernel-64k-devel-5.14.0-284.75.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool-7.0.0-284.75.1.el9_2, kernel-5.14.0-284.75.1.el9_2, kernel-64k-5.14.0-284.75.1.el9_2 +29
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.8.8) | Fixed | RHSA-2024:5255 |
| Red Hat CodeReady Linux Builder EUS (v.9.2) | Fixed | RHSA-2024:4823 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:4928 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:4823 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2024:5101 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2024:4928 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2024:6753 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2024:6753 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.8) | Fixed | RHSA-2024:5255 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.2) | Fixed | RHSA-2024:4823 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2024:6753 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:5101 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:4928 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2024:5102 |
| Red Hat Enterprise Linux NFV (v. 9) | Fixed | RHSA-2024:4928 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2024:5102 |
| Red Hat Enterprise Linux RT (v. 9) | Fixed | RHSA-2024:4928 |
| Red Hat Enterprise Linux Real Time EUS (v.9.2) | Fixed | RHSA-2024:4831 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) | Fixed | RHSA-2024:4831 |
Not affected: 2 products
- Red Hat Enterprise Linux AppStream EUS (v.9.2)
- Red Hat Enterprise Linux BaseOS EUS (v.8.8)
Timeline
- 2026-10-02 Threatist record created from CVE-2024-26773
- 2026-10-03 Alias added: GHSA-j648-rgv6-ccc8
References
Patch 8
- https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea
- https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d
- https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03
- https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5
- https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36
- https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1
- https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe
- https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53
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Sources
- CVE-2024-26773 · CVE Program
- CVE-2024-26773 · NVD
- FIRST EPSS
- GHSA-j648-rgv6-ccc8 · GitHub Advisory Database · CC BY 4.0
- CVE-2024-26773 · Red Hat security data · CC BY 4.0
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