Answer in brief
CVE-2024-26883 records a Unknown severity vulnerability in bpf: Fix stackmap overflow check on 32-bit arches. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2024-26883 records a Unknown severity vulnerability in bpf: Fix stackmap overflow check on 32-bit arches. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=063c722dd9d285d877e6fd499e753d6224f4c046 <d0e214acc59145ce25113f617311aa79dda39cb3 || >=7e3a6b820535eb395784060ae26c5af579528fa0 <21e5fa4688e1a4d3db6b72216231b24232f75c1d || >=8032bf2af9ce26b3a362b9711d15f626ab946a74 <15641007df0f0d35fa28742b25c2a7db9dcd6895 || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <ca1f06e72dec41ae4f76e7b1a8a97265447b46ae || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <f06899582ccee09bd85d0696290e3eaca9aa042d || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <7070b274c7866a4c5036f8d54fcaf315c64ac33a || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <43f798b9036491fb014b55dd61c4c5c3193267d0 || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <0971126c8164abe2004b8536b49690a0d6005b0a || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <7a4b21250bf79eef26543d35bd390448646c536b || 253150830a012adfccf90afcebae8fda5b05a80f || 766107351731ae223ebf60ca22bdfeb47ce6acc8 || >=4.19.177 <4.19.311 || >=5.4.99 <5.4.273 || >=5.10.17 <5.10.214 || >=4.9.258 <4.10 || >=4.14.222 <4.15 | d0e214acc59145ce25113f617311aa79dda39cb3, 21e5fa4688e1a4d3db6b72216231b24232f75c1d, 15641007df0f0d35fa28742b25c2a7db9dcd6895, ca1f06e72dec41ae4f76e7b1a8a97265447b46ae, f06899582ccee09bd85d0696290e3eaca9aa042d, 7070b274c7866a4c5036f8d54fcaf315c64ac33a, 43f798b9036491fb014b55dd61c4c5c3193267d0, 0971126c8164abe2004b8536b49690a0d6005b0a, 7a4b21250bf79eef26543d35bd390448646c536b, 4.19.311, 5.4.273, 5.10.214, 4.10, 4.15 |
| Linux/Linuxgeneric | 5.11 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=063c722dd9d285d877e6fd499e753d6224f4c046 <d0e214acc59145ce25113f617311aa79dda39cb3 || >=7e3a6b820535eb395784060ae26c5af579528fa0 <21e5fa4688e1a4d3db6b72216231b24232f75c1d || >=8032bf2af9ce26b3a362b9711d15f626ab946a74 <15641007df0f0d35fa28742b25c2a7db9dcd6895 || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <ca1f06e72dec41ae4f76e7b1a8a97265447b46ae || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <f06899582ccee09bd85d0696290e3eaca9aa042d || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <7070b274c7866a4c5036f8d54fcaf315c64ac33a || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <43f798b9036491fb014b55dd61c4c5c3193267d0 || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <0971126c8164abe2004b8536b49690a0d6005b0a || >=6183f4d3a0a2ad230511987c6c362ca43ec0055f <7a4b21250bf79eef26543d35bd390448646c536b || 253150830a012adfccf90afcebae8fda5b05a80f || 766107351731ae223ebf60ca22bdfeb47ce6acc8 || >=4.19.177 <4.19.311 || >=5.4.99 <5.4.273 || >=5.10.17 <5.10.214 || >=4.9.258 <4.10 || >=4.14.222 <4.15 | d0e214acc59145ce25113f617311aa79dda39cb3, 21e5fa4688e1a4d3db6b72216231b24232f75c1d, 15641007df0f0d35fa28742b25c2a7db9dcd6895, ca1f06e72dec41ae4f76e7b1a8a97265447b46ae, f06899582ccee09bd85d0696290e3eaca9aa042d, 7070b274c7866a4c5036f8d54fcaf315c64ac33a, 43f798b9036491fb014b55dd61c4c5c3193267d0, 0971126c8164abe2004b8536b49690a0d6005b0a, 7a4b21250bf79eef26543d35bd390448646c536b, 4.19.311, 5.4.273, 5.10.214, 4.10, 4.15 |
| Linux/Linuxgeneric | 5.11 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.
Quoted source text, attributed separately from HOL analysis.