AZL-80004
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-80004.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-80004
- Upstream
- Published
- 2026-03-18T11:16:16Z
- Modified
- 2026-08-28T17:47:48.855969960Z
- Summary
- CVE-2026-23243 affecting package kernel for versions less than 6.6.130.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
RDMA/umad: Reject negative datalen in ibumad_write
ibumadwrite computes datalen from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, datalen can become negative and reach ibcreatesendmad(). This can make the padding calculation exceed the segment size and trigger an out-of-bounds memset in allocsendrmpplist().
Add an explicit check to reject negative data_len before creating the send buffer.
KASAN splat: [ 211.363464] BUG: KASAN: slab-out-of-bounds in ibcreatesendmad+0xa01/0x11b0 [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spraythread/102 [ 211.365867] ibcreatesendmad+0xa01/0x11b0 [ 211.365887] ibumad_write+0x853/0x1c80
- References