Answer in brief
CVE-2026-45999 records a High severity (CVSS 7.1) vulnerability in erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=598162d050801e556750defff4ddab499e5d76ed <778acd52e9497806fbd2cea7f770c41d6850fc48 || >=598162d050801e556750defff4ddab499e5d76ed <118ff71ff09ebaf323a09af9e911517321a299f4 || >=598162d050801e556750defff4ddab499e5d76ed <43a878639b90e9721ffa5eb616a7e6d8454adef3 || >=598162d050801e556750defff4ddab499e5d76ed <f1374fa6e57fd836623668d782ded9244cfd2938 || >=598162d050801e556750defff4ddab499e5d76ed <c9ce18e6bb2c467ec85756dc7989b547b7584fee || >=598162d050801e556750defff4ddab499e5d76ed <bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e || >=598162d050801e556750defff4ddab499e5d76ed <21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab | 778acd52e9497806fbd2cea7f770c41d6850fc48, 118ff71ff09ebaf323a09af9e911517321a299f4, 43a878639b90e9721ffa5eb616a7e6d8454adef3, f1374fa6e57fd836623668d782ded9244cfd2938, c9ce18e6bb2c467ec85756dc7989b547b7584fee, bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e, 21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array. However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path. Let's add an additional check to fix this for backporting. Reproducible image (base64-encoded gzipped blob): H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA= $ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-45999 records a High severity (CVSS 7.1) vulnerability in erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=598162d050801e556750defff4ddab499e5d76ed <778acd52e9497806fbd2cea7f770c41d6850fc48 || >=598162d050801e556750defff4ddab499e5d76ed <118ff71ff09ebaf323a09af9e911517321a299f4 || >=598162d050801e556750defff4ddab499e5d76ed <43a878639b90e9721ffa5eb616a7e6d8454adef3 || >=598162d050801e556750defff4ddab499e5d76ed <f1374fa6e57fd836623668d782ded9244cfd2938 || >=598162d050801e556750defff4ddab499e5d76ed <c9ce18e6bb2c467ec85756dc7989b547b7584fee || >=598162d050801e556750defff4ddab499e5d76ed <bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e || >=598162d050801e556750defff4ddab499e5d76ed <21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab | 778acd52e9497806fbd2cea7f770c41d6850fc48, 118ff71ff09ebaf323a09af9e911517321a299f4, 43a878639b90e9721ffa5eb616a7e6d8454adef3, f1374fa6e57fd836623668d782ded9244cfd2938, c9ce18e6bb2c467ec85756dc7989b547b7584fee, bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e, 21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array. However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path. Let's add an additional check to fix this for backporting. Reproducible image (base64-encoded gzipped blob): H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA= $ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1
Quoted source text, attributed separately from HOL analysis.