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Back to active CVEs
High ยท CVSS 7.8CVE-2024-26773

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

Answer in brief

CVE-2024-26773 records a High severity (CVSS 7.8) vulnerability in ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 3, 2024Updated Oct 15, 2026Source checked Nov 6, 2026First seen by HOL Aug 5, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
High ยท CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
9 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric3.12Not reported
Linux/Linuxgeneric>=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <21f8cfe79f776287459343e9cfa6055af61328ea || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <260fc96283c0f594de18a1b045faf6d8fb42874d || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <927794a02169778c9c2e7b25c768ab3ea8c1dc03 || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <4c21fa60a6f4606f6214a38f50612b17b2f738f5 || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <f97e75fa4e12b0aa0224e83fcbda8853ac2adf36 || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <0184747b552d6b5a14db3b7fcc3b792ce64dedd1 || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <a2576ae9a35c078e488f2c573e9e6821d651fbbe || >=163a203ddb36c36d4a1c942aececda0cc8d06aa7 <4530b3660d396a646aad91a787b6ab37cf604b5321f8cfe79f776287459343e9cfa6055af61328ea, 260fc96283c0f594de18a1b045faf6d8fb42874d, 927794a02169778c9c2e7b25c768ab3ea8c1dc03, 4c21fa60a6f4606f6214a38f50612b17b2f738f5, f97e75fa4e12b0aa0224e83fcbda8853ac2adf36, 0184747b552d6b5a14db3b7fcc3b792ce64dedd1, a2576ae9a35c078e488f2c573e9e6821d651fbbe, 4530b3660d396a646aad91a787b6ab37cf604b53
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.0 <V3.1.5V3.1.5
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.0 <V3.1.5V3.1.5
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.0 <V3.1.5V3.1.5

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP.
  2. 2Review the reported fix. Update Linux/Linux to 21f8cfe79f776287459343e9cfa6055af61328ea; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to V3.1.5; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to V3.1.5; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to V3.1.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 3, 2024

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencelists.debian.org
  • Source referencelists.debian.org
Upstream source description

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

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
NVD-CWE-noinfo
Source
CVE List V5
Source checked
Nov 6, 2026
References
12 linked sources
Open source record