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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"https://ubuntu.com/security/CVE-2026-23112\n\n[ Impact ]\n\nnvmet_tcp_build_pdu_iovec() can walk past cmd->req.sg when a PDU length\nor offset exceeds sg_cnt, then use bogus sg->length/offset values leading\nto _copy_to_iter() GPF/KASAN. An attacker with access to the NVMe-TCP\ntarget interface could trigger a kernel crash.\n\n\n[ Fix ]\n\nCherry-picked from mainline for questing and noble. Adjusted for jammy\ndue to older iovec style.\n\n\n[ Test Plan ]\n\nAll three kernels were compile-tested and boot-tested. PoC verification\nconfirmed the vulnerability is no longer triggerable after the fix.\n\n\n[ Where Problems Could Occur ]\n\nIf the bounds checks are incorrect, NVMe-TCP connections could be\nprematurely terminated or the target could become unresponsive. In the\nworst case, a malformed check could still allow out-of-bounds access."}