CVE-2026-97583
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: afs: Clear stale peer app data after address list changes afs_fs_probe_fileserver() fetches the current endpoint state under server->fs_lock, but leaves old_alist as NULL. Consequently, afs_set_peer_appdata() treats every address list replacement as initial setup and only binds the new peers; it never unbinds peers removed from the old list. An address refresh can therefore proceed as follows. CPU 0 replaces server S's list and drops Pold without clearing Pold->app_data. The server destroyer then clears only S's current peers and lets S reach its RCU callback. After the callback frees S, CPU 1 handles a callback through an RxRPC connection that still pins Pold, reads Pold->app_data, and calls afs_use_server() on the freed object. KASAN reported: BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0 Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74 Call Trace: afs_find_server+0x3c/0xa0 afs_rx_new_call+0x15c/0x390 rxrpc_new_incoming_call+0x97c/0x1730 rxrpc_input_packet.constprop.0+0xd03/0xec0 rxrpc_io_thread+0x967/0x1640 Allocated by task 93: afs_lookup_server+0x1a7/0x14c0 afs_alloc_server_list+0x43f/0xb60 afs_create_volume+0x923/0x1490 afs_get_tree+0x1c6/0x10a0 Freed by task 0: kfree+0x131/0x3c0 rcu_core+0x50a/0x1850 Last potentially related work creation: __call_rcu_common.constprop.0+0x71/0xa10 afs_put_server+0x213/0x2b0 Preserve old->addresses for the peer app-data update so that removed peers are cleared before the endpoint state is replaced. Also advance both cursors when the old and new lists share a peer; activating the old/new comparison without this would otherwise loop forever on the shared entry.
View original CVE JSON
{
"id": "CVE-2026-97583",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:09.127",
"lastModified": "2026-10-19T10:17:27.647",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Clear stale peer app data after address list changes\n\nafs_fs_probe_fileserver() fetches the current endpoint state under\nserver->fs_lock, but leaves old_alist as NULL. Consequently,\nafs_set_peer_appdata() treats every address list replacement as initial\nsetup and only binds the new peers; it never unbinds peers removed from\nthe old list.\n\nAn address refresh can therefore proceed as follows. CPU 0 replaces\nserver S's list and drops Pold without clearing Pold->app_data. The\nserver destroyer then clears only S's current peers and lets S reach its\nRCU callback. After the callback frees S, CPU 1 handles a callback\nthrough an RxRPC connection that still pins Pold, reads Pold->app_data,\nand calls afs_use_server() on the freed object.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0\n Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74\n Call Trace:\n afs_find_server+0x3c/0xa0\n afs_rx_new_call+0x15c/0x390\n rxrpc_new_incoming_call+0x97c/0x1730\n rxrpc_input_packet.constprop.0+0xd03/0xec0\n rxrpc_io_thread+0x967/0x1640\n Allocated by task 93:\n afs_lookup_server+0x1a7/0x14c0\n afs_alloc_server_list+0x43f/0xb60\n afs_create_volume+0x923/0x1490\n afs_get_tree+0x1c6/0x10a0\n Freed by task 0:\n kfree+0x131/0x3c0\n rcu_core+0x50a/0x1850\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x71/0xa10\n afs_put_server+0x213/0x2b0\n\nPreserve old->addresses for the peer app-data update so that removed\npeers are cleared before the endpoint state is replaced. Also advance\nboth cursors when the old and new lists share a peer; activating the\nold/new comparison without this would otherwise loop forever on the\nshared entry."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/afs/addr_list.c",
"fs/afs/fs_probe.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "39ba6af83a7f9dee3e6a7916f41a48bcbda54eba",
"lessThan": "3afb988fd0411707bdafb9b321086fff0da28aae",
"versionType": "git",
"status": "affected"
},
{
"version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
"lessThan": "c7f77a11a1e719192c7262aad38a3919aec62c21",
"versionType": "git",
"status": "affected"
},
{
"version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
"lessThan": "7f7f5589d048821dea316cbac9b37d27eaf7530e",
"versionType": "git",
"status": "affected"
},
{
"version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
"lessThan": "ba0623fc19a424f4745394c499f9f28a8d88d397",
"versionType": "git",
"status": "affected"
},
{
"version": "6.12.101",
"lessThan": "6.12.111",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/afs/addr_list.c",
"fs/afs/fs_probe.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.15",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.111",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.6,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3afb988fd0411707bdafb9b321086fff0da28aae",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7f7f5589d048821dea316cbac9b37d27eaf7530e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ba0623fc19a424f4745394c499f9f28a8d88d397",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c7f77a11a1e719192c7262aad38a3919aec62c21",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}