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CVE-2025-21996— drm/radeon: fix uninitialized size issue in radeon_vce_cs_parse()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未初始化大小问题。

AI Predicted 7.8 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2fc5703abda201f138faf63bdca743d04dbf4b1a< 0effb378ebce52b897f85cd7f828854b8c7cb636 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< 5b4d9d20fd455a97920cf158dd19163b879cf65d affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< 9b2da9c673a0da1359a2151f7ce773e2f77d71a9 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< 78b07dada3f02f77762d0755a96d35f53b02be69 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< 3ce08215cad55c10a6eeeb33d3583b6cfffe3ab8 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< dd1801aa01bba1760357f2a641346ae149686713 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< f5e049028124f755283f2c07e7a3708361ed1dc8 affected
2fc5703abda201f138faf63bdca743d04dbf4b1a< dd8689b52a24807c2d5ce0a17cb26dc87f75235c affected
… +10 more rows
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I. Basic Information for CVE-2025-21996

Vulnerability Information
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Vulnerability Title
drm/radeon: fix uninitialized size issue in radeon_vce_cs_parse()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/radeon: fix uninitialized size issue in radeon_vce_cs_parse() On the off chance that command stream passed from userspace via ioctl() call to radeon_vce_cs_parse() is weirdly crafted and first command to execute is to encode (case 0x03000001), the function in question will attempt to call radeon_vce_cs_reloc() with size argument that has not been properly initialized. Specifically, 'size' will point to 'tmp' variable before the latter had a chance to be assigned any value. Play it safe and init 'tmp' with 0, thus ensuring that radeon_vce_cs_reloc() will catch an early error in cases like these. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE. (cherry picked from commit 2d52de55f9ee7aaee0e09ac443f77855989c6b68)
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未初始化大小问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2fc5703abda201f138faf63bdca743d04dbf4b1a ~ 0effb378ebce52b897f85cd7f828854b8c7cb636 -
Linux Linux 3.15 -

II. Public POCs for CVE-2025-21996

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III. Intelligence Information for CVE-2025-21996

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Patches & Fixes for CVE-2025-21996 (1)

Same Patch Batch · Linux · 2025-04-03 · 13 CVEs total

CVE-2025-22004 8.6 HIGH net: atm: fix use after free in lec_send()
CVE-2025-22001 7.8 HIGH accel/qaic: Fix integer overflow in qaic_validate_req()
CVE-2025-21999 7.8 HIGH proc: fix UAF in proc_get_inode()
CVE-2025-22007 Bluetooth: Fix error code in chan_alloc_skb_cb()
CVE-2025-22006 net: ethernet: ti: am65-cpsw: Fix NAPI registration sequence
CVE-2025-22005 ipv6: Fix memleak of nhc_pcpu_rth_output in fib_check_nh_v6_gw().
CVE-2025-22003 can: ucan: fix out of bound read in strscpy() source
CVE-2025-22002 netfs: Call `invalidate_cache` only if implemented
CVE-2025-22000 mm/huge_memory: drop beyond-EOF folios with the right number of refs
CVE-2025-21998 firmware: qcom: uefisecapp: fix efivars registration race
CVE-2025-21997 xsk: fix an integer overflow in xp_create_and_assign_umem()
CVE-2025-21995 drm/sched: Fix fence reference count leak

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21996

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