{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98052","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:19:56.072Z","datePublished":"2026-09-25T10:24:00.441Z","dateUpdated":"2026-10-03T11:01:51.633Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T11:01:51.633Z"},"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":{"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"},"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"],"versions":[{"version":"490cb412007de593e07c1d3e2b1ec4233886707c","lessThan":"1e213ba7cb3b9dd97ac2e0a1054e6d0d1d91f5bc","status":"affected","versionType":"git"},{"version":"490cb412007de593e07c1d3e2b1ec4233886707c","lessThan":"9b26b54861ce05307d39a54ddedddf8747419614","status":"affected","versionType":"git"},{"version":"490cb412007de593e07c1d3e2b1ec4233886707c","lessThan":"47a5cecca925ceb175d5adf712e667acf78f475f","status":"affected","versionType":"git"},{"version":"490cb412007de593e07c1d3e2b1ec4233886707c","lessThan":"17e6ad484dea5ddf1c4a3d6ec77a5929161234de","status":"affected","versionType":"git"},{"version":"490cb412007de593e07c1d3e2b1ec4233886707c","lessThan":"18e5e0ec0e9282c897e2aa81a3e43ccaee03b003","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/broadcom/asp2/bcmasp_intf.c"],"versions":[{"version":"6.6","status":"affected"},{"version":"0","lessThan":"6.6","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","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":"6.6","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3-rc3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1e213ba7cb3b9dd97ac2e0a1054e6d0d1d91f5bc"},{"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"}}}}