{"id":"CVE-2026-89511","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89511","summary":"qede: Fix NULL pointer dereference in TPA fragment processing","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nqede: Fix NULL pointer dereference in TPA fragment processing\n\nUnder memory pressure, the qede driver encounters NULL pointer\ndereferences when processing TPA continuation fragments.\n\nCommit 8a8633978b84 (\"qede: Add build_skb() support.\") accidentally\ndropped the assignment of tpa_info->buffer.data in qede_tpa_start().\n\nWhen memory pressure causes an SKB allocation failure in qede_tpa_start(),\nthe driver sets tpa_start_fail = true and attempts to recycle the physical\npage later in qede_tpa_end() via qede_reuse_page(). However, because\nbuffer.data was left uninitialized (NULL), qede_reuse_page() pushes a\n\"ghost\" BD (valid DMA mapping but NULL data pointer) back into the\nactive Rx ring.\n\nThe next time the hardware uses this ring slot, it passes a NULL page\nto qede_fill_frag_skb(), causing a kernel panic.\n\nExample crash from production system:\n BUG: unable to handle kernel NULL pointer dereference at 0x8\n RIP: qede_fill_frag_skb+0x96/0x430 [qede]\n Call Trace:\n   qede_rx_int+0xb06/0x1de0\n   qede_poll+0x2f4/0x6c0\n   __napi_poll+0x2d/0x130\n\nFix the root cause by restoring the tpa_info->buffer.data assignment\nin qede_tpa_start(), ensuring valid pages are correctly tracked and\nrecycled. Additionally, update the stale comment for\nstruct qede_agg_info::buffer to reflect its current usage.","published":"2026-09-11T19:43:56.640Z","modified":"2026-09-14T03:46:01.885891245Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/06aa3d26327f24edd039ff249672fdf6f2ba5695"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a952fb1b20d83e83ca852773e6188511f7d2191"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7f911e208b3ca2c76d9f2bbba1f54b9403568c10"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5c8619ccbd70102642120c4c6fda1c048a555fd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89511.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89511"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:46:01.885891245Z"}}