qede: Fix NULL pointer dereference in TPA fragment processing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89511
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:33 UTC
Updated2026-09-11 20:19:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: qede: Fix NULL pointer dereference in TPA fragment processing Under memory pressure, the qede driver encounters NULL pointer dereferences when processing TPA continuation fragments. Commit 8a8633978b84 ("qede: Add build_skb() support.") accidentally dropped the assignment of tpa_info->buffer.data in qede_tpa_start(). When memory pressure causes an SKB allocation failure in qede_tpa_start(), the driver sets tpa_start_fail = true and attempts to recycle the physical page later in qede_tpa_end() via qede_reuse_page(). However, because buffer.data was left uninitialized (NULL), qede_reuse_page() pushes a "ghost" BD (valid DMA mapping but NULL data pointer) back into the active Rx ring. The next time the hardware uses this ring slot, it passes a NULL page to qede_fill_frag_skb(), causing a kernel panic. Example crash from production system: BUG: unable to handle kernel NULL pointer dereference at 0x8 RIP: qede_fill_frag_skb+0x96/0x430 [qede] Call Trace: qede_rx_int+0xb06/0x1de0 qede_poll+0x2f4/0x6c0 __napi_poll+0x2d/0x130 Fix the root cause by restoring the tpa_info->buffer.data assignment in qede_tpa_start(), ensuring valid pages are correctly tracked and recycled. Additionally, update the stale comment for struct qede_agg_info::buffer to reflect its current usage.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8a8633978b842c88fbcfe00d4e5dde96048f630e 7f911e208b3ca2c76d9f2bbba1f54b9403568c10 git Not specified
CNA Linux Linux affected 8a8633978b842c88fbcfe00d4e5dde96048f630e 2a952fb1b20d83e83ca852773e6188511f7d2191 git Not specified
CNA Linux Linux affected 8a8633978b842c88fbcfe00d4e5dde96048f630e f5c8619ccbd70102642120c4c6fda1c048a555fd git Not specified
CNA Linux Linux affected 8a8633978b842c88fbcfe00d4e5dde96048f630e 06aa3d26327f24edd039ff249672fdf6f2ba5695 git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2a952fb1b20d83e83ca852773e6188511f7d2191 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f911e208b3ca2c76d9f2bbba1f54b9403568c10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5c8619ccbd70102642120c4c6fda1c048a555fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06aa3d26327f24edd039ff249672fdf6f2ba5695 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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