GHSA-R6JQ-C3GP-4896
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-10-03 12:31In the Linux kernel, the following vulnerability has been resolved:
net: bcmasp: clear txcb->last before writing each descriptor
bcmasp_xmit() only wrote txcb->last = true for the final fragment of an SKB; non-final fragments left the field untouched. If a descriptor slot was reused while it still held a stale true from a previous SKB (possible when tx_spb_ring_full() underreported fullness), bcmasp_tx_reclaim() would see last == true mid-SKB and call dev_consume_skb_any() prematurely, freeing the sk_buff while its remaining fragments were still in flight.
Unconditionally clear txcb->last before the conditional set so every descriptor slot starts from a known false state regardless of what a prior transmission left behind.
{
"affected": [],
"aliases": [
"CVE-2026-98052"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:34Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb-\u003elast before writing each descriptor\n\nbcmasp_xmit() only wrote txcb-\u003elast = 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-\u003elast before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind.",
"id": "GHSA-r6jq-c3gp-4896",
"modified": "2026-10-03T12:31:25Z",
"published": "2026-09-25T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98052"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1e213ba7cb3b9dd97ac2e0a1054e6d0d1d91f5bc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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