{"api_version":"1","generated_at":"2026-09-25T22:18:11+00:00","cve":"CVE-2026-98052","urls":{"html":"https://cve.report/CVE-2026-98052","api":"https://cve.report/api/cve/CVE-2026-98052.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98052","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98052"},"summary":{"title":"net: bcmasp: clear txcb->last before writing each descriptor","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb->last before writing each descriptor\n\nbcmasp_xmit() only wrote txcb->last = true for the final fragment\nof an SKB; non-final fragments left the field untouched.  If a\ndescriptor slot was reused while it still held a stale true from\na previous SKB (possible when tx_spb_ring_full() underreported\nfullness), bcmasp_tx_reclaim() would see last == true mid-SKB and\ncall dev_consume_skb_any() prematurely, freeing the sk_buff while\nits remaining fragments were still in flight.\n\nUnconditionally clear txcb->last before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:34","updated_at":"2026-09-25 15:18:05"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003","name":"https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de","name":"https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614","name":"https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f","name":"https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98052","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98052","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490cb412007de593e07c1d3e2b1ec4233886707c 9b26b54861ce05307d39a54ddedddf8747419614 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490cb412007de593e07c1d3e2b1ec4233886707c 47a5cecca925ceb175d5adf712e667acf78f475f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490cb412007de593e07c1d3e2b1ec4233886707c 17e6ad484dea5ddf1c4a3d6ec77a5929161234de git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 490cb412007de593e07c1d3e2b1ec4233886707c 18e5e0ec0e9282c897e2aa81a3e43ccaee03b003 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9b26b54861ce05307d39a54ddedddf8747419614","status":"affected","version":"490cb412007de593e07c1d3e2b1ec4233886707c","versionType":"git"},{"lessThan":"47a5cecca925ceb175d5adf712e667acf78f475f","status":"affected","version":"490cb412007de593e07c1d3e2b1ec4233886707c","versionType":"git"},{"lessThan":"17e6ad484dea5ddf1c4a3d6ec77a5929161234de","status":"affected","version":"490cb412007de593e07c1d3e2b1ec4233886707c","versionType":"git"},{"lessThan":"18e5e0ec0e9282c897e2aa81a3e43ccaee03b003","status":"affected","version":"490cb412007de593e07c1d3e2b1ec4233886707c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.6"},{"lessThan":"6.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"6.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb->last before writing each descriptor\n\nbcmasp_xmit() only wrote txcb->last = true for the final fragment\nof an SKB; non-final fragments left the field untouched.  If a\ndescriptor slot was reused while it still held a stale true from\na previous SKB (possible when tx_spb_ring_full() underreported\nfullness), bcmasp_tx_reclaim() would see last == true mid-SKB and\ncall dev_consume_skb_any() prematurely, freeing the sk_buff while\nits remaining fragments were still in flight.\n\nUnconditionally clear txcb->last before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in bcmasp_xmit() TX ring bookkeeping, reached via sendmsg/sendfile -> dev_queue_xmit -> bcmasp_xmit; no malformed input exists and the trigger is TX ring pressure from multi-fragment (NETIF_F_SG) SKBs, which a local user produces by flooding sockets through the bcmasp interface.\nAC:L - The attacker controls the traffic load: flooding multi-frag SKBs makes buggy tx_spb_ring_full() let bcmasp_xmit overwrite unreclaimed slots, so non-final fragments repeatedly land in slots holding a stale txcb->last=true; no hardware state outside the attacker's control is needed.\nPR:L - Sending TCP/UDP traffic that egresses the bcmasp netdev needs only an ordinary unprivileged local account; there is no capability check anywhere on the transmit path.\nUI:N - No victim action is involved; the attacker generates the transmit traffic entirely by themselves.\nS:U - The corruption affects kernel sk_buff/page memory in the same kernel that runs the driver; no VM or IOMMU boundary is crossed.\nC:H - bcmasp_tx_reclaim() frees the skb (dev_consume_skb_any) while its later fragments are still mapped for DMA, so freed and reallocated pages can be transmitted on the wire and the stale skb is accessed again: a use-after-free with disclosure potential.\nI:H - When the real final fragment is reclaimed later, dev_consume_skb_any() is called a second time on the same skb, a double free/UAF of sk_buff and frag pages that could be groomed into slab corruption.\nA:H - Double freeing the sk_buff and touching freed memory in bcmasp_tx_reclaim() from TX NAPI causes slab corruption and kernel oops/panic on the host."}]}],"providerMetadata":{"dateUpdated":"2026-09-25T14:41:58.081Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614"},{"url":"https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f"},{"url":"https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de"},{"url":"https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003"}],"title":"net: bcmasp: clear txcb->last before writing each descriptor","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98052","datePublished":"2026-09-25T10:24:00.441Z","dateReserved":"2026-09-25T10:19:56.072Z","dateUpdated":"2026-09-25T14:41:58.081Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:34","lastModifiedDate":"2026-09-25 15:18:05","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98052","Ordinal":"1","Title":"net: bcmasp: clear txcb->last before writing each descriptor","CVE":"CVE-2026-98052","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98052","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb->last before writing each descriptor\n\nbcmasp_xmit() only wrote txcb->last = true for the final fragment\nof an SKB; non-final fragments left the field untouched.  If a\ndescriptor slot was reused while it still held a stale true from\na previous SKB (possible when tx_spb_ring_full() underreported\nfullness), bcmasp_tx_reclaim() would see last == true mid-SKB and\ncall dev_consume_skb_any() prematurely, freeing the sk_buff while\nits remaining fragments were still in flight.\n\nUnconditionally clear txcb->last before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind.","Type":"Description","Title":"net: bcmasp: clear txcb->last before writing each descriptor"}]}}}