{"id":"CVE-2026-68418","title":"RDMA/irdma: Prevent user-triggered null deref on QP create","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent user-triggered null deref on QP create\n\nPreviously, the user QP creation path would only attempt to\npopulate iwqp->iwpbl if the user-provided req.us…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d52ff592abfcd56234f266aa245c489f70b1c554","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ad68e0b759f9569f0dfea84f035c91eadb979802","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ec675b4cdfd378d8c9dd8c93126c024f2469bd79","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 728211c815f6eef28dd3df2a5b6297483185aa20","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < b9b0889071569d43623c260074e159cd8f26adb1","Linux 5.14"],"published":"2026-08-10","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:44:05.184Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68418","references":[{"url":"https://git.kernel.org/stable/c/d52ff592abfcd56234f266aa245c489f70b1c554"},{"url":"https://git.kernel.org/stable/c/ad68e0b759f9569f0dfea84f035c91eadb979802"},{"url":"https://git.kernel.org/stable/c/ec675b4cdfd378d8c9dd8c93126c024f2469bd79"},{"url":"https://git.kernel.org/stable/c/728211c815f6eef28dd3df2a5b6297483185aa20"},{"url":"https://git.kernel.org/stable/c/b9b0889071569d43623c260074e159cd8f26adb1"}],"tags":["cve.org"],"epss":0.00155,"epssPercentile":0.04206,"ingestedAt":"2026-10-21T12:48:53.599Z","slug":"CVE-2026-68418","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent user-triggered null deref on QP create\n\nPreviously, the user QP creation path would only attempt to\npopulate iwqp->iwpbl if the user-provided req.user_wqe_bufs\nfield was non-zero. The problem is that iwqp->iwpbl is\nunconditionally dereferenced later on in irdma_setup_virt_qp.\n\nWhile there was a check for iwqp->iwpbl != NULL, this check\nwould only occur if req.user_wqe_bufs was non-zero. The end\nresult is that a user could send a zero user_wqe_bufs value\nand trigger a null ptr deref.\n\nFix this by unconditionally calling irdma_get_pbl and bailing\nif it fails, similar to the CQ and SRQ paths.\n\n## Affected\n\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d52ff592abfcd56234f266aa245c489f70b1c554`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ad68e0b759f9569f0dfea84f035c91eadb979802`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ec675b4cdfd378d8c9dd8c93126c024f2469bd79`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 728211c815f6eef28dd3df2a5b6297483185aa20`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < b9b0889071569d43623c260074e159cd8f26adb1`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}