CVE-2025-38538: debian debian_linux Out-of-bounds Write
Vulnerability summary
CVE-2025-38538 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 49 · Related 47Timeline
- 16-08-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: nbpfaxi: Fix memory corruption in probe() The nbpf->chan[] array is allocated earlier in the nbpf_probe() function and it has "num_channels" elements. These three loops iterate one element farther than they should and corrupt memory. The changes to the second loop are more involved. In this case, we're copying data from the irqbuf[] array into the nbpf->chan[] array. If the data in irqbuf[i] is the error IRQ then we skip it, so the iterators are not in sync. I added a check to ensure that we don't go beyond the end of the irqbuf[] array. I'm pretty sure this can't happen, but it seemed harmless to add a check. On the other hand, after the loop has ended there is a check to ensure that the "chan" iterator is where we expect it to be. In the original code we went one element beyond the end of the array so the iterator wasn't in the correct place and it would always return -EINVAL. However, now it will always be in the correct place. I deleted the check since we know the result.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.01 pp
From 0.17% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu147 products
- linuxAll versions (No fix recorded) | < 5.15.0-163.173 | < 6.8.0-100.100
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1097.104 | < 6.8.0-1046.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.147-1 | < 6.12.41-1 | < 6.16.3-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < 84fff8e6f11b9af1407e273995b5257d99ff0cff | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < aec396b4f736f3f8d2c28a9cd2924a4ada57ae87 | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < 24861ef8b517a309a4225f2793be0cd8fa0bec9e | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < f366b36c5e3ce29c9a3c8eed3d1631908e4fc8bb | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < 4bb016438335ec02b01f96bf1367378c2bfe03e5 | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < 122160289adf8ebf15060f1cbf6265b55a914948 | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < d6bbd67ab5de37a74ac85c83c5a26664b62034dd | ≥ b45b262cefd5b8eb2ba88d20e5bd295881293894, < 188c6ba1dd925849c5d94885c8bbdeb0b3dcf510 | 3.17
- linux_kernel≥ 3.17, < 5.4.297 | ≥ 5.5, < 5.10.241 | ≥ 5.11, < 5.15.190 | ≥ 5.16, < 6.1.147 | ≥ 6.2, < 6.6.100 | ≥ 6.7, < 6.12.40 | ≥ 6.13, < 6.15.8 | 6.16:rc1 | 6.16:rc2 | 6.16:rc3 | 6.16:rc4 | 6.16:rc5 | 6.16:rc6
3 vendors · 151 products
