CVE-2024-56558

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Source
https://cve.org/CVERecord?id=CVE-2024-56558
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-56558.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-56558
Downstream
Related
Published
2024-12-27T14:23:03.902Z
Modified
2026-03-20T12:39:50.538861Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
nfsd: make sure exp active before svc_export_show
Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: make sure exp active before svcexportshow

The function e_show was called with protection from RCU. This only ensures that exp will not be freed. Therefore, the reference count for exp can drop to zero, which will trigger a refcount use-after-free warning when exp_get is called. To resolve this issue, use cache_get_rcu to ensure that exp remains active.

------------[ cut here ]------------ refcountt: addition on 0; use-after-free. WARNING: CPU: 3 PID: 819 at lib/refcount.c:25 refcountwarnsaturate+0xb1/0x120 CPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcountwarnsaturate+0xb1/0x120 ... Call Trace: <TASK> eshow+0x20b/0x230 [nfsd] seqreaditer+0x589/0x770 seqread+0x1e5/0x270 vfsread+0x125/0x530 ksysread+0xc1/0x160 dosyscall64+0x5f/0x170 entrySYSCALL64after_hwframe+0x76/0x7e

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56558.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
bf18f163e89c52e09c96534db45c4274273a0b34
Fixed
e2fa0d0e327279a8defb87b263cd0bf288fd9261
Fixed
7fd29d284b55c2274f7a748e6c5f25b4758b8da5
Fixed
6cefcadd34e3c71c81ea64b899a0daa86314a51a
Fixed
7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec
Fixed
1cecfdbc6bfc89c516d286884c7f29267b95de2b
Fixed
7365d1f8de63cffdbbaa2287ce0205438e1a922f
Fixed
be8f982c369c965faffa198b46060f8853e0f1f0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-56558.json"