{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-49070","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T01:49:39.244Z","datePublished":"2025-02-26T01:54:36.360Z","dateUpdated":"2025-10-01T19:57:06.034Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T08:29:05.142Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Fix unregistering of framebuffers without device\n\nOF framebuffers do not have an underlying device in the Linux\ndevice hierarchy. Do a regular unregister call instead of hot\nunplugging such a non-existing device. Fixes a NULL dereference.\nAn example error message on ppc64le is shown below.\n\n  BUG: Kernel NULL pointer dereference on read at 0x00000060\n  Faulting instruction address: 0xc00000000080dfa4\n  Oops: Kernel access of bad area, sig: 11 [#1]\n  LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\n  [...]\n  CPU: 2 PID: 139 Comm: systemd-udevd Not tainted 5.17.0-ae085d7f9365 #1\n  NIP:  c00000000080dfa4 LR: c00000000080df9c CTR: c000000000797430\n  REGS: c000000004132fe0 TRAP: 0300   Not tainted  (5.17.0-ae085d7f9365)\n  MSR:  8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 28228282  XER: 20000000\n  CFAR: c00000000000c80c DAR: 0000000000000060 DSISR: 40000000 IRQMASK: 0\n  GPR00: c00000000080df9c c000000004133280 c00000000169d200 0000000000000029\n  GPR04: 00000000ffffefff c000000004132f90 c000000004132f88 0000000000000000\n  GPR08: c0000000015658f8 c0000000015cd200 c0000000014f57d0 0000000048228283\n  GPR12: 0000000000000000 c00000003fffe300 0000000020000000 0000000000000000\n  GPR16: 0000000000000000 0000000113fc4a40 0000000000000005 0000000113fcfb80\n  GPR20: 000001000f7283b0 0000000000000000 c000000000e4a588 c000000000e4a5b0\n  GPR24: 0000000000000001 00000000000a0000 c008000000db0168 c0000000021f6ec0\n  GPR28: c0000000016d65a8 c000000004b36460 0000000000000000 c0000000016d64b0\n  NIP [c00000000080dfa4] do_remove_conflicting_framebuffers+0x184/0x1d0\n  [c000000004133280] [c00000000080df9c] do_remove_conflicting_framebuffers+0x17c/0x1d0 (unreliable)\n  [c000000004133350] [c00000000080e4d0] remove_conflicting_framebuffers+0x60/0x150\n  [c0000000041333a0] [c00000000080e6f4] remove_conflicting_pci_framebuffers+0x134/0x1b0\n  [c000000004133450] [c008000000e70438] drm_aperture_remove_conflicting_pci_framebuffers+0x90/0x100 [drm]\n  [c000000004133490] [c008000000da0ce4] bochs_pci_probe+0x6c/0xa64 [bochs]\n  [...]\n  [c000000004133db0] [c00000000002aaa0] system_call_exception+0x170/0x2d0\n  [c000000004133e10] [c00000000000c3cc] system_call_common+0xec/0x250\n\nThe bug [1] was introduced by commit 27599aacbaef (\"fbdev: Hot-unplug\nfirmware fb devices on forced removal\"). Most firmware framebuffers\nhave an underlying platform device, which can be hot-unplugged\nbefore loading the native graphics driver. OF framebuffers do not\n(yet) have that device. Fix the code by unregistering the framebuffer\nas before without a hot unplug.\n\nTested with 5.17 on qemu ppc64le emulation."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbmem.c"],"versions":[{"version":"c894ac44786cfed383a6c6b20c1bfb12eb96018a","lessThan":"2388f826cdc9af2651991adc0feb79de9bdf2232","status":"affected","versionType":"git"},{"version":"9565a3b5203a4d57acbc1d0e981c6df71864b4ab","lessThan":"de33df481545974ba47c46f05194e769e4307843","status":"affected","versionType":"git"},{"version":"4d695d7c276f15adb1d2b64c584c3cf8f4f9e9ce","lessThan":"feed87ff122b1640c221d4dd559442ab2cd50bb1","status":"affected","versionType":"git"},{"version":"27599aacbaefcbf2af7b06b0029459bbf682000d","lessThan":"0f525289ff0ddeb380813bd81e0f9bdaaa1c9078","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbmem.c"],"versions":[{"version":"5.15.33","lessThan":"5.15.34","status":"affected","versionType":"semver"},{"version":"5.16.19","lessThan":"5.16.20","status":"affected","versionType":"semver"},{"version":"5.17.2","lessThan":"5.17.3","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.33","versionEndExcluding":"5.15.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16.19","versionEndExcluding":"5.16.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.2","versionEndExcluding":"5.17.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2388f826cdc9af2651991adc0feb79de9bdf2232"},{"url":"https://git.kernel.org/stable/c/de33df481545974ba47c46f05194e769e4307843"},{"url":"https://git.kernel.org/stable/c/feed87ff122b1640c221d4dd559442ab2cd50bb1"},{"url":"https://git.kernel.org/stable/c/0f525289ff0ddeb380813bd81e0f9bdaaa1c9078"}],"title":"fbdev: Fix unregistering of framebuffers without device","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-49070","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:49:37.472130Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T19:57:06.034Z"}}]}}