{"id":"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-\u003ebuffer.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-\u003ebuffer.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.","modified":"2026-09-13T03:47:18.740765246Z","published":"2026-09-11T19:43:56.640Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89511.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8a8633978b842c88fbcfe00d4e5dde96048f630e"},{"fixed":"7f911e208b3ca2c76d9f2bbba1f54b9403568c10"},{"fixed":"2a952fb1b20d83e83ca852773e6188511f7d2191"},{"fixed":"f5c8619ccbd70102642120c4c6fda1c048a555fd"},{"fixed":"06aa3d26327f24edd039ff249672fdf6f2ba5695"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89511.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89511.json"}}],"schema_version":"1.9.0"}