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afs: Clear stale peer app data after address list changes

Type: advisorySource: Official CVE List1 source record

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 remov

Announced Source revision 1
Original source ↗

CVE-2026-97583

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-2026-97583

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "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"
      }
    ],
    "programFiles": [
      "fs/afs/addr_list.c",
      "fs/afs/fs_probe.c"
    ],
    "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": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/afs/addr_list.c",
      "fs/afs/fs_probe.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97583

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38027 · Revision 1
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Publisher date
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