Bug 2426061 (CVE-2023-54325)

Summary: CVE-2023-54325 kernel: crypto: qat - fix out-of-bounds read
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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An out-of-bounds read vulnerability was found in the Linux kernel's Intel QAT (QuickAssist Technology) crypto driver. When preparing an AES-CTR encryption request on QAT GEN4 devices, the driver rounds up the key size by 16 bytes before copying. If this rounding occurs before the memcpy operation, the driver reads beyond the bounds of the user-provided key buffer.
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Description OSIDB Bzimport 2025-12-30 13:05:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: qat - fix out-of-bounds read

When preparing an AER-CTR request, the driver copies the key provided by
the user into a data structure that is accessible by the firmware.
If the target device is QAT GEN4, the key size is rounded up by 16 since
a rounded up size is expected by the device.
If the key size is rounded up before the copy, the size used for copying
the key might be bigger than the size of the region containing the key,
causing an out-of-bounds read.

Fix by doing the copy first and then update the keylen.

This is to fix the following warning reported by KASAN:

	[  138.150574] BUG: KASAN: global-out-of-bounds in qat_alg_skcipher_init_com.isra.0+0x197/0x250 [intel_qat]
	[  138.150641] Read of size 32 at addr ffffffff88c402c0 by task cryptomgr_test/2340

	[  138.150651] CPU: 15 PID: 2340 Comm: cryptomgr_test Not tainted 6.2.0-rc1+ #45
	[  138.150659] Hardware name: Intel Corporation ArcherCity/ArcherCity, BIOS EGSDCRB1.86B.0087.D13.2208261706 08/26/2022
	[  138.150663] Call Trace:
	[  138.150668]  <TASK>
	[  138.150922]  kasan_check_range+0x13a/0x1c0
	[  138.150931]  memcpy+0x1f/0x60
	[  138.150940]  qat_alg_skcipher_init_com.isra.0+0x197/0x250 [intel_qat]
	[  138.151006]  qat_alg_skcipher_init_sessions+0xc1/0x240 [intel_qat]
	[  138.151073]  crypto_skcipher_setkey+0x82/0x160
	[  138.151085]  ? prepare_keybuf+0xa2/0xd0
	[  138.151095]  test_skcipher_vec_cfg+0x2b8/0x800
Comment 1 Alexander B 2025-12-31 12:01:41 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123016-CVE-2023-54325-3e5c@gregkh/T