{
  "threat_severity" : "Moderate",
  "public_date" : "2025-02-10T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: drm/v3d: Assign job pointer to NULL before signaling the fence",
    "id" : "2344679",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2344679"
  },
  "cvss3" : {
    "cvss3_base_score" : "4.7",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-362",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ndrm/v3d: Assign job pointer to NULL before signaling the fence\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.\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.\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[  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 : 0000000000000000\n[  466.552941] x5 : ffffffd08c4100d0 x4 : ffffffafadfb0000 x3 : ffffffc080003f70\n[  466.560102] x2 : ffffffc0829e8058 x1 : 0000000000000001 x0 : 0000000000000000\n[  466.567263] Call trace:\n[  466.569711]  v3d_irq+0x118/0x2e0 [v3d] (P)\n[  466.\n---truncated---" ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-21688\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21688\nhttps://lore.kernel.org/linux-cve-announce/2025021054-CVE-2025-21688-bdf5@gregkh/T" ],
  "name" : "CVE-2025-21688",
  "csaw" : false
}