High 7.8Published Apr 3, 2024

CVE-2024-26773ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()

Updated under an hour ago (Oct 27, 2026, 1:30 PM ET)

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It affects Linux and 8 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	163a203ddb36c36d4a1c942aececda0cc8d06aa7 builds before 21f8cfe79f776287459343e9cfa6055af61328ea; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before 260fc96283c0f594de18a1b045faf6d8fb42874d; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before 927794a02169778c9c2e7b25c768ab3ea8c1dc03; 163a203ddb36c36d4a1c942aececda0cc8d06aa7 builds before 4c21fa60a6f4606f6214a38f50612b17b2f738f5; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before f97e75fa4e12b0aa0224e83fcbda8853ac2adf36; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before 0184747b552d6b5a14db3b7fcc3b792ce64dedd1; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before a2576ae9a35c078e488f2c573e9e6821d651fbbe; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7 before 4530b3660d396a646aad91a787b6ab37cf604b53	CNA record
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	all versions not affected	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	all versions not affected	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	all versions not affected	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	before 4.19.308; from 4.20 before 5.4.270; from 5.5 before 5.10.211; from 5.11 before 5.15.150; from 5.16 before 6.1.80; from 6.2 before 6.6.19; from 6.7 before 6.7.7; 6.8; and 1 more ranges	NVD
debian debian_linux debian:debian_linux	10.0	NVD

References

References

https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea	patch
https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d	patch
https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03	patch
https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5	patch
https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36	patch
https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1	patch
https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe	patch
https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53	patch
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html	mailing-list
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html	mailing-list
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.