CVE-2021-47478: isofs: Fix out of bound access for corrupted isofs image
Vulnerability summary
CVE-2021-47478 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.7% of scored vulnerabilities.
Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 10Timeline
- 22-05-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: isofs: Fix out of bound access for corrupted isofs image When isofs image is suitably corrupted isofs_read_inode() can read data beyond the end of buffer. Sanity-check the directory entry length before using it.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.69%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.69% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu89 products
- linuxAll versions (No fix recorded) | < 4.15.0-167.175 | < 5.4.0-97.110
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1119.127 | < 5.4.0-1064.67
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 156ce5bb6cc43a80a743810199defb1dc3f55b7f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9ec33a9b8790c212cc926a88c5e2105f97f3f57e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < afbd40f425227e661d991757e11cc4db024e761f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b0ddff8d68f2e43857a84dce54c3deab181c8ae1 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6e80e9314f8bb52d9eabe1907698718ff01120f5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 86d4aedcbc69c0f84551fb70f953c24e396de2d7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b2fa1f52d22c5455217b294629346ad23a744945 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e7fb722586a2936b37bdff096c095c30ca06404d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e96a1866b40570b5950cda8602c2819189c62a48 | 2.6.12
- linux_kernel< 4.4.292 | ≥ 4.5, < 4.9.290 | ≥ 4.10, < 4.14.255 | ≥ 4.15, < 4.19.217 | ≥ 4.20, < 5.4.159 | ≥ 5.5, < 5.10.79 | ≥ 5.11, < 5.14.18 | ≥ 5.15, < 5.15.2
Debian1 product
- linux< 5.15.3-1
3 vendors · 92 products
