{"uuid": "e962b8a1-e4ab-4667-85b3-e51b610f66a9", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21688", "type": "seen", "source": "https://t.me/cvedetector/17566", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21688 - Raspberry Pi DRM V3D NULL Pointer Dereference\", \n  \"Content\": \"CVE ID : CVE-2025-21688 \nPublished : Feb. 10, 2025, 4:15 p.m. | 1\u00a0hour, 27\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \ndrm/v3d: Assign job pointer to NULL before signaling the fence  \n  \nIn commit e4b5ccd392b9 (\"drm/v3d: Ensure job pointer is set to NULL  \nafter job completion\"), we introduced a change to assign the job pointer  \nto NULL after completing a job, indicating job completion.  \n  \nHowever, this approach created a race condition between the DRM  \nscheduler workqueue and the IRQ execution thread. As soon as the fence is  \nsignaled in the IRQ execution thread, a new job starts to be executed.  \nThis results in a race condition where the IRQ execution thread sets the  \njob pointer to NULL simultaneously as the `run_job()` function assigns  \na new job to the pointer.  \n  \nThis race condition can lead to a NULL pointer dereference if the IRQ  \nexecution thread sets the job pointer to NULL after `run_job()` assigns  \nit to the new job. When the new job completes and the GPU emits an  \ninterrupt, `v3d_irq()` is triggered, potentially causing a crash.  \n  \n[  466.310099] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000c0  \n[  466.318928] Mem abort info:  \n[  466.321723]   ESR = 0x0000000096000005  \n[  466.325479]   EC = 0x25: DABT (current EL), IL = 32 bits  \n[  466.330807]   SET = 0, FnV = 0  \n[  466.333864]   EA = 0, S1PTW = 0  \n[  466.337010]   FSC = 0x05: level 1 translation fault  \n[  466.341900] Data abort info:  \n[  466.344783]   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000  \n[  466.350285]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0  \n[  466.355350]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0  \n[  466.360677] user pgtable: 4k pages, 39-bit VAs, pgdp=0000000089772000  \n[  466.367140] [00000000000000c0] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000  \n[  466.375875] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP  \n[  466.382163] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device algif_hash algif_skcipher af_alg bnep binfmt_misc vc4 snd_soc_hdmi_codec drm_display_helper cec brcmfmac_wcc spidev rpivid_hevc(C) drm_client_lib brcmfmac hci_uart drm_dma_helper pisp_be btbcm brcmutil snd_soc_core aes_ce_blk v4l2_mem2mem bluetooth aes_ce_cipher snd_compress videobuf2_dma_contig ghash_ce cfg80211 gf128mul snd_pcm_dmaengine videobuf2_memops ecdh_generic sha2_ce ecc videobuf2_v4l2 snd_pcm v3d sha256_arm64 rfkill videodev snd_timer sha1_ce libaes gpu_sched snd videobuf2_common sha1_generic drm_shmem_helper mc rp1_pio drm_kms_helper raspberrypi_hwmon spi_bcm2835 gpio_keys i2c_brcmstb rp1 raspberrypi_gpiomem rp1_mailbox rp1_adc nvmem_rmem uio_pdrv_genirq uio i2c_dev drm ledtrig_pattern drm_panel_orientation_quirks backlight fuse dm_mod ip_tables x_tables ipv6  \n[  466.458429] CPU: 0 UID: 1000 PID: 2008 Comm: chromium Tainted: G         C         6.13.0-v8+ #18  \n[  466.467336] Tainted: [C]=CRAP  \n[  466.470306] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)  \n[  466.476157] pstate: 404000c9 (nZcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  \n[  466.483143] pc : v3d_irq+0x118/0x2e0 [v3d]  \n[  466.487258] lr : __handle_irq_event_percpu+0x60/0x228  \n[  466.492327] sp : ffffffc080003ea0  \n[  466.495646] x29: ffffffc080003ea0 x28: ffffff80c0c94200 x27: 0000000000000000  \n[  466.502807] x26: ffffffd08dd81d7b x25: ffffff80c0c94200 x24: ffffff8003bdc200  \n[  466.509969] x23: 0000000000000001 x22: 00000000000000a7 x21: 0000000000000000  \n[  466.517130] x20: ffffff8041bb0000 x19: 0000000000000001 x18: 0000000000000000  \n[  466.524291] x17: ffffffafadfb0000 x16: ffffffc080000000 x15: 0000000000000000  \n[  466.531452] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000  \n[  466.538613] x11: 0000000000000000 x10: 0000000000000000 x9 : ffffffd08c527eb0  \n[  466.545777] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000[...]", "creation_timestamp": "2025-02-10T18:45:39.000000Z"}