GHSA-P2QJ-W526-VFR2
Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2026-01-09 15:30In the Linux kernel, the following vulnerability has been resolved:
crypto: ccp - Fix crash when rebind ccp device for ccp.ko
When CONFIG_CRYPTO_DEV_CCP_DEBUGFS is enabled, rebinding the ccp device causes the following crash:
$ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/unbind $ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/bind
[ 204.976930] BUG: kernel NULL pointer dereference, address: 0000000000000098 [ 204.978026] #PF: supervisor write access in kernel mode [ 204.979126] #PF: error_code(0x0002) - not-present page [ 204.980226] PGD 0 P4D 0 [ 204.981317] Oops: Oops: 0002 [#1] SMP NOPTI ... [ 204.997852] Call Trace: [ 204.999074] [ 205.000297] start_creating+0x9f/0x1c0 [ 205.001533] debugfs_create_dir+0x1f/0x170 [ 205.002769] ? srso_return_thunk+0x5/0x5f [ 205.004000] ccp5_debugfs_setup+0x87/0x170 [ccp] [ 205.005241] ccp5_init+0x8b2/0x960 [ccp] [ 205.006469] ccp_dev_init+0xd4/0x150 [ccp] [ 205.007709] sp_init+0x5f/0x80 [ccp] [ 205.008942] sp_pci_probe+0x283/0x2e0 [ccp] [ 205.010165] ? srso_return_thunk+0x5/0x5f [ 205.011376] local_pci_probe+0x4f/0xb0 [ 205.012584] pci_device_probe+0xdb/0x230 [ 205.013810] really_probe+0xed/0x380 [ 205.015024] __driver_probe_device+0x7e/0x160 [ 205.016240] device_driver_attach+0x2f/0x60 [ 205.017457] bind_store+0x7c/0xb0 [ 205.018663] drv_attr_store+0x28/0x40 [ 205.019868] sysfs_kf_write+0x5f/0x70 [ 205.021065] kernfs_fop_write_iter+0x145/0x1d0 [ 205.022267] vfs_write+0x308/0x440 [ 205.023453] ksys_write+0x6d/0xe0 [ 205.024616] __x64_sys_write+0x1e/0x30 [ 205.025778] x64_sys_call+0x16ba/0x2150 [ 205.026942] do_syscall_64+0x56/0x1e0 [ 205.028108] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 205.029276] RIP: 0033:0x7fbc36f10104 [ 205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5
This patch sets ccp_debugfs_dir to NULL after destroying it in ccp5_debugfs_destroy, allowing the directory dentry to be recreated when rebinding the ccp device.
Tested on AMD Ryzen 7 1700X.
{
"affected": [],
"aliases": [
"CVE-2025-38581"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-19T17:15:35Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Fix crash when rebind ccp device for ccp.ko\n\nWhen CONFIG_CRYPTO_DEV_CCP_DEBUGFS is enabled, rebinding\nthe ccp device causes the following crash:\n\n$ echo \u00270000:0a:00.2\u0027 \u003e /sys/bus/pci/drivers/ccp/unbind\n$ echo \u00270000:0a:00.2\u0027 \u003e /sys/bus/pci/drivers/ccp/bind\n\n[ 204.976930] BUG: kernel NULL pointer dereference, address: 0000000000000098\n[ 204.978026] #PF: supervisor write access in kernel mode\n[ 204.979126] #PF: error_code(0x0002) - not-present page\n[ 204.980226] PGD 0 P4D 0\n[ 204.981317] Oops: Oops: 0002 [#1] SMP NOPTI\n...\n[ 204.997852] Call Trace:\n[ 204.999074] \u003cTASK\u003e\n[ 205.000297] start_creating+0x9f/0x1c0\n[ 205.001533] debugfs_create_dir+0x1f/0x170\n[ 205.002769] ? srso_return_thunk+0x5/0x5f\n[ 205.004000] ccp5_debugfs_setup+0x87/0x170 [ccp]\n[ 205.005241] ccp5_init+0x8b2/0x960 [ccp]\n[ 205.006469] ccp_dev_init+0xd4/0x150 [ccp]\n[ 205.007709] sp_init+0x5f/0x80 [ccp]\n[ 205.008942] sp_pci_probe+0x283/0x2e0 [ccp]\n[ 205.010165] ? srso_return_thunk+0x5/0x5f\n[ 205.011376] local_pci_probe+0x4f/0xb0\n[ 205.012584] pci_device_probe+0xdb/0x230\n[ 205.013810] really_probe+0xed/0x380\n[ 205.015024] __driver_probe_device+0x7e/0x160\n[ 205.016240] device_driver_attach+0x2f/0x60\n[ 205.017457] bind_store+0x7c/0xb0\n[ 205.018663] drv_attr_store+0x28/0x40\n[ 205.019868] sysfs_kf_write+0x5f/0x70\n[ 205.021065] kernfs_fop_write_iter+0x145/0x1d0\n[ 205.022267] vfs_write+0x308/0x440\n[ 205.023453] ksys_write+0x6d/0xe0\n[ 205.024616] __x64_sys_write+0x1e/0x30\n[ 205.025778] x64_sys_call+0x16ba/0x2150\n[ 205.026942] do_syscall_64+0x56/0x1e0\n[ 205.028108] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 205.029276] RIP: 0033:0x7fbc36f10104\n[ 205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5\n\nThis patch sets ccp_debugfs_dir to NULL after destroying it in\nccp5_debugfs_destroy, allowing the directory dentry to be\nrecreated when rebinding the ccp device.\n\nTested on AMD Ryzen 7 1700X.",
"id": "GHSA-p2qj-w526-vfr2",
"modified": "2026-01-09T15:30:22Z",
"published": "2025-08-19T18:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38581"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/181698af38d3f93381229ad89c09b5bd0496661a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/20c0ed8dd65834e6bab464f54cd6ff68659bacb9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d4060f05e74dbee884ba723f6afd9282befc3c5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64ec9a7e7a6398b172ab6feba60e952163a1c3d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6eadf50c1d894cb34f3237064063207460946040"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9dea08eac4f6d6fbbae59992978252e2edab995d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a25ab6dfa0ce323ec308966988be6b675eb9d3e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce63a83925964ab7564bd216bd92b80bc365492e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db111468531777cac8b4beb6515a88a54b0c4a74"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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