CVE-2026-45994ibmasm: fix OOB reads in command_file_write due to missing size checks
- 7.1HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ibmasm: fix OOB reads in command_file_write due to missing size checks The command_file_write() handler allocates a kernel buffer of exactly count bytes and copies user data into it, but does not validate the buffer against the dot command protocol before passing it to get_dot_command_size() and get_dot_command_timeout(). Since both the allocation size (count) and the header fields (command_size, data_size) are independently user-controlled, an attacker can cause get_dot_command_size() to return a value exceeding the allocation, triggering OOB reads in get_dot_command_timeout() and an out-of-bounds memcpy_toio() that leaks kernel heap memory to the service processor. Fix with two guards: reject writes smaller than sizeof(struct dot_command_header) before allocation, then after copying user data reject commands where the buffer is smaller than the total size declared by the header (sizeof(header) + command_size + data_size). This ensures all subsequent header and payload field accesses stay within the buffer.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 18 days later
· 18 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 44ee19422aa82a6847594866de7e5a31e4ef98b3
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 7b8a574da5d7ea99b943f7a3458a17a1d95e8838
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d50e2019c9d7c433f56d9dff65703eb904aa1fb1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a672682d39dd34e2b5ba4feb436723bed65125ff
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < aefc1a97da17d8309974690c8a03e439a91ebb1c
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ee5737891464030a189837467df3b81a273718ad
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d0fb4d1dc43f8d5179917a2daaa82680993d4cdf
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0eb09f737428e482a32a2e31e5e223f2b35a71d3
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/44ee19422aa82a6847594866de7e5a31e4ef98b3 (opens in a new tab)
- https://git.kernel.org/stable/c/7b8a574da5d7ea99b943f7a3458a17a1d95e8838 (opens in a new tab)
- https://git.kernel.org/stable/c/d50e2019c9d7c433f56d9dff65703eb904aa1fb1 (opens in a new tab)
- https://git.kernel.org/stable/c/a672682d39dd34e2b5ba4feb436723bed65125ff (opens in a new tab)
- https://git.kernel.org/stable/c/aefc1a97da17d8309974690c8a03e439a91ebb1c (opens in a new tab)
- https://git.kernel.org/stable/c/ee5737891464030a189837467df3b81a273718ad (opens in a new tab)
- https://git.kernel.org/stable/c/d0fb4d1dc43f8d5179917a2daaa82680993d4cdf (opens in a new tab)
- https://git.kernel.org/stable/c/0eb09f737428e482a32a2e31e5e223f2b35a71d3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32290 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-45994)Record last updated .