{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43031","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:55.977Z","datePublished":"2026-05-01T14:15:31.256Z","dateUpdated":"2026-08-05T12:25:24.979Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:25:24.979Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xilinx: axienet: Fix BQL accounting for multi-BD TX packets\n\nWhen a TX packet spans multiple buffer descriptors (scatter-gather),\naxienet_free_tx_chain sums the per-BD actual length from descriptor\nstatus into a caller-provided accumulator. That sum is reset on each\nNAPI poll. If the BDs for a single packet complete across different\npolls, the earlier bytes are lost and never credited to BQL. This\ncauses BQL to think bytes are permanently in-flight, eventually\nstalling the TX queue.\n\nThe SKB pointer is stored only on the last BD of a packet. When that\nBD completes, use skb->len for the byte count instead of summing\nper-BD status lengths. This matches netdev_sent_queue(), which debits\nskb->len, and naturally survives across polls because no partial\npacket contributes to the accumulator."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable cleanup runs on transmitted packets for a network interface; in a reasonable embedded/router/server deployment, an unauthenticated remote peer can cause multi-fragment replies or forwarded traffic to be transmitted through the affected axienet device.\nAC:L - The trigger is repeated multi-BD scatter-gather TX completion with descriptors split across NAPI polls, which can be induced through sustained traffic and does not require winning an attacker-uncontrolled race.\nPR:N - No local privileges are needed in the network-triggered scenario because packets from a remote peer can cause the host or forwarding device to transmit through the affected interface.\nUI:N - Once the affected interface is up and carrying traffic, exploitation does not require any user action by a victim.\nS:U - The impact remains within the kernel/network device availability scope and does not cross a virtualization, sandbox, or separate security authority boundary.\nC:N - The bug is an accounting mismatch in BQL byte completion reporting; it does not expose memory contents or create a read primitive.\nI:N - The vulnerable path does not corrupt memory or attacker-controlled data; it under-credits completed TX bytes and affects queue state only.\nA:H - Repeated under-accounting makes BQL believe bytes remain permanently in flight, eventually stalling the TX queue and causing a persistent denial of transmit service on the affected network interface."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/xilinx/xilinx_axienet_main.c"],"versions":[{"version":"c900e49d58eb32b192b6d200ace4ae3ab89779d4","lessThan":"2a0323a913109b52bfc9f5ea7b92a1b249e07d3e","status":"affected","versionType":"git"},{"version":"c900e49d58eb32b192b6d200ace4ae3ab89779d4","lessThan":"3c3a6b9020c01fde7b22e8550105de0b59904f61","status":"affected","versionType":"git"},{"version":"c900e49d58eb32b192b6d200ace4ae3ab89779d4","lessThan":"d1978d03e86785872871bff9c2623174b10740de","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/xilinx/xilinx_axienet_main.c"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2a0323a913109b52bfc9f5ea7b92a1b249e07d3e"},{"url":"https://git.kernel.org/stable/c/3c3a6b9020c01fde7b22e8550105de0b59904f61"},{"url":"https://git.kernel.org/stable/c/d1978d03e86785872871bff9c2623174b10740de"}],"title":"net: xilinx: axienet: Fix BQL accounting for multi-BD TX packets","x_generator":{"engine":"bippy-1.2.0"}}}}