{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23243","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.989Z","datePublished":"2026-03-18T10:05:05.826Z","dateUpdated":"2026-05-11T22:03:05.550Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:03:05.550Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umad: Reject negative data_len in ib_umad_write\n\nib_umad_write computes data_len from user-controlled count and the\nMAD header sizes. With a mismatched user MAD header size and RMPP\nheader length, data_len can become negative and reach ib_create_send_mad().\nThis can make the padding calculation exceed the segment size and trigger\nan out-of-bounds memset in alloc_send_rmpp_list().\n\nAdd an explicit check to reject negative data_len before creating the\nsend buffer.\n\nKASAN splat:\n[  211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0\n[  211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102\n[  211.365867] ib_create_send_mad+0xa01/0x11b0\n[  211.365887] ib_umad_write+0x853/0x1c80"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/user_mad.c"],"versions":[{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"1371ef6b1ecf3676b8942f5dfb3634fb0648128e","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"362e45fd9069ffa1523f9f1633b606ebf72060d7","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"6eb2919474ca105c5b13d19574e25f0ddcf19ca2","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"9c80d688f402539dfc8f336de1380d6b4ee14316","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"205955f29c26330b1dc7fdeadd5bb97c38e26f56","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b","status":"affected","versionType":"git"},{"version":"2be8e3ee8efd6f99ce454115c29d09750915021a","lessThan":"5551b02fdbfd85a325bb857f3a8f9c9f33397ed2","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/core/user_mad.c"],"versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","status":"unaffected","versionType":"semver"},{"version":"5.10.252","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.202","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.165","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.128","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.75","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.14","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.4","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e"},{"url":"https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7"},{"url":"https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2"},{"url":"https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d"},{"url":"https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316"},{"url":"https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56"},{"url":"https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b"},{"url":"https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2"}],"title":"RDMA/umad: Reject negative data_len in ib_umad_write","x_generator":{"engine":"bippy-1.2.0"}}}}