CVE - CVE-2024-56558

CVE-ID
CVE-2024-56558	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: make sure exp active before svc_export_show 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 ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 819 at lib/refcount.c:25 refcount_warn_saturate+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:refcount_warn_saturate+0xb1/0x120 ... Call Trace: <TASK> e_show+0x20b/0x230 [nfsd] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1cecfdbc6bfc89c516d286884c7f29267b95de2b URL:https://git.kernel.org/stable/c/1cecfdbc6bfc89c516d286884c7f29267b95de2b MISC:https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a URL:https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a MISC:https://git.kernel.org/stable/c/7365d1f8de63cffdbbaa2287ce0205438e1a922f URL:https://git.kernel.org/stable/c/7365d1f8de63cffdbbaa2287ce0205438e1a922f MISC:https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec URL:https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec MISC:https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5 URL:https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5 MISC:https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0 URL:https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0 MISC:https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261 URL:https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261
Assigning CNA
kernel.org
Date Record Created
20241227	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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