net: libwx: fix races in Tx timestamp handling
In the Linux kernel, the following vulnerability has been resolved: net: libwx: fix races in Tx timestamp handling wx->ptp_tx_skb is shared between the Tx path, the PTP auxiliary worker and the timestamp cleanup paths. The WX_STATE_PTP_TX_IN_PROGRESS bit prevents multiple Tx paths from submitting timestamp requests, but does not serialize the worker against cleanup. As a result, wx_ptp_clear_tx_timestamp() can free an skb after wx_ptp_tx_hwtstamp_work() has obtained its pointer. The worker may then pass the freed skb to skb_tstamp_tx() and release the same reference again. The cleanup path may also clear the in-progress bit while the worker is still processing the old skb. This allows the Tx path to publish a new skb which the worker can subsequently overwrite with NULL, leaking its reference. Add a dedicated spinlock to protect publication and consumption of the Tx timestamp skb. Detach the skb and clear the in-progress bit while holding the lock, then deliver the timestamp and release the skb after dropping it. Use the same locked cleanup in the quiesce path, but keep the detach there free of register accesses: quiesce runs during PCIe error recovery, where MMIO is not reliable, and it deliberately did not touch the device before. The lock is taken with interrupts disabled, because netpoll can call ndo_start_xmit() with hard interrupts already off. When handling a Tx DMA mapping failure, keep the transmit path reference until after comparing the skb under the lock. This pre
CVE-2026-98562
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98562
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "06e75161b9d4833518a7c266310a0635eab50616",
"lessThan": "e78b95cfd5df25d0c562aaef95d3c7fe6c7e0e66",
"versionType": "git"
},
{
"status": "affected",
"version": "06e75161b9d4833518a7c266310a0635eab50616",
"lessThan": "3173cba1170131816972ed2b6185cb970ba8b747",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/wangxun/libwx/wx_hw.c",
"drivers/net/ethernet/wangxun/libwx/wx_lib.c",
"drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
"drivers/net/ethernet/wangxun/libwx/wx_type.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/wangxun/libwx/wx_hw.c",
"drivers/net/ethernet/wangxun/libwx/wx_lib.c",
"drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
"drivers/net/ethernet/wangxun/libwx/wx_type.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98562
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38582 · Revision 1
- Added to Heist Feed
- Publisher date