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vuln-cve/data/2025/39xxx/CVE-2025-39873.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39873",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.144Z",
"datePublished": "2025-09-23T06:00:46.157Z",
"dateUpdated": "2026-08-05T12:05:49.898Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:05:49.898Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB\n\ncan_put_echo_skb() takes ownership of the SKB and it may be freed\nduring or after the call.\n\nHowever, xilinx_can xcan_write_frame() keeps using SKB after the call.\n\nFix that by only calling can_put_echo_skb() after the code is done\ntouching the SKB.\n\nThe tx_lock is held for the entire xcan_write_frame() execution and\nalso on the can_get_echo_skb() side so the order of operations does not\nmatter.\n\nAn earlier fix commit 3d3c817c3a40 (\"can: xilinx_can: Fix usage of skb\nmemory\") did not move the can_put_echo_skb() call far enough.\n\n[mkl: add \"commit\" in front of sha1 in patch description]\n[mkl: fix indention]"
}
],
"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 vulnerable code is only reached from `ndo_start_xmit` on the xilinx_can device, i.e. by a local process transmitting a frame through a `PF_CAN` socket (`sendmsg()`); received bus traffic does not enter this path. Exploitation therefore requires local system access.\nAC:L - The attacker drives both the transmission and the conditions that make `can_put_echo_skb()` free the SKB (TX flooding to saturate the FIFO/echo slots, memory pressure to fail the `GFP_ATOMIC` `skb_clone`), and can retry indefinitely at line rate; the free is not a race the attacker cannot influence.\nPR:L - `can_create()` in net/can/af_can.c and the CAN_RAW protocol perform no capability check, so any unprivileged local user can open a raw CAN socket, bind it to the interface and transmit. No root or CAP_NET_ADMIN is needed to reach `xcan_write_frame()`.\nUI:N - The attacker's own `sendmsg()` call drives the whole path; no victim action or cooperation is required.\nS:U - The corruption stays within the kernel's own security authority — freed kernel heap and the driver's MMIO window — with no crossing of a hypervisor, IOMMU or sandbox boundary.\nC:H - The UAF reads freed (and, with a groomed `cf->len`, out-of-bounds) kernel heap contents and writes them into the CAN controller's TX registers, which are then transmitted on the physical CAN bus where any node — including the attacker's — can read them, giving direct kernel memory disclosure.\nI:H - `cf->len` read from reclaimed memory is unbounded (up to 255), so the write loop overruns the mailbox's data window and writes attacker-influenced dwords into adjacent CAN controller registers, and a UAF of this kind is generally leverageable into heap-spray-based write primitives; it also injects arbitrary frame content onto a safety-critical bus.\nA:H - The use-after-free triggers a KASAN panic on hardened kernels, and the out-of-bounds register writes plus lost echo-SKB accounting corrupt controller state and permanently wedge the TX queue (`netif_stop_queue()` with no matching completion), producing a crash or denial of CAN service."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/can/xilinx_can.c"
],
"versions": [
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "e202ffd9e54538ef67ec301ebd6d9da4823466c9",
"status": "affected",
"versionType": "git"
},
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "1139321161a3ba5e45e61e0738b37f42f20bc57a",
"status": "affected",
"versionType": "git"
},
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "94b050726288a56a6b8ff55aa641f2fedbd3b44c",
"status": "affected",
"versionType": "git"
},
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "725b33deebd6e4c96fe7893f384510a54258f28f",
"status": "affected",
"versionType": "git"
},
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "668cc1e3bb21101d074e430de1b7ba8fd10189e7",
"status": "affected",
"versionType": "git"
},
{
"version": "1598efe57b3e768056e4ca56cb9cf33111e68d1c",
"lessThan": "ef79f00be72bd81d2e1e6f060d83cf7e425deee4",
"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/can/xilinx_can.c"
],
"versions": [
{
"version": "4.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.19",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.194",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.153",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.107",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.48",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16.8",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"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": "4.19",
"versionEndExcluding": "5.15.194"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
"versionEndExcluding": "6.1.153"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
"versionEndExcluding": "6.6.107"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
"versionEndExcluding": "6.12.48"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
"versionEndExcluding": "6.16.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
"versionEndExcluding": "6.17"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9"
},
{
"url": "https://git.kernel.org/stable/c/1139321161a3ba5e45e61e0738b37f42f20bc57a"
},
{
"url": "https://git.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44c"
},
{
"url": "https://git.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28f"
},
{
"url": "https://git.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7"
},
{
"url": "https://git.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4"
}
],
"title": "can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:44:20.103Z"
}
}
]
}
}
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