CVE-2021-47540 (GCVE-0-2021-47540)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2025-05-04 07:13
VLAI?
Title
mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode
Summary
In the Linux kernel, the following vulnerability has been resolved: mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode Fix the following NULL pointer dereference in mt7915_get_phy_mode routine adding an ibss interface to the mt7915 driver. [ 101.137097] wlan0: Trigger new scan to find an IBSS to join [ 102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69 [ 103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 103.073670] Mem abort info: [ 103.076520] ESR = 0x96000005 [ 103.079614] EC = 0x25: DABT (current EL), IL = 32 bits [ 103.084934] SET = 0, FnV = 0 [ 103.088042] EA = 0, S1PTW = 0 [ 103.091215] Data abort info: [ 103.094104] ISV = 0, ISS = 0x00000005 [ 103.098041] CM = 0, WnR = 0 [ 103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000 [ 103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [ 103.116590] Internal error: Oops: 96000005 [#1] SMP [ 103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0 [ 103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT) [ 103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211] [ 103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--) [ 103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e] [ 103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e] [ 103.223927] sp : ffffffc011cdb9e0 [ 103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098 [ 103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40 [ 103.237855] x25: 0000000000000001 x24: 000000000000011f [ 103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918 [ 103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58 [ 103.253785] x19: ffffff8006744400 x18: 0000000000000000 [ 103.259094] x17: 0000000000000000 x16: 0000000000000001 [ 103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8 [ 103.269713] x13: 0000000000000000 x12: 0000000000000000 [ 103.275024] x11: ffffffc010e30c20 x10: 0000000000000000 [ 103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88 [ 103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44 [ 103.290952] x5 : 0000000000000002 x4 : 0000000000000001 [ 103.296262] x3 : 0000000000000001 x2 : 0000000000000001 [ 103.301572] x1 : 0000000000000000 x0 : 0000000000000011 [ 103.306882] Call trace: [ 103.309328] mt7915_get_phy_mode+0x68/0x120 [mt7915e] [ 103.314378] mt7915_bss_info_changed+0x198/0x200 [mt7915e] [ 103.319941] ieee80211_bss_info_change_notify+0x128/0x290 [mac80211] [ 103.326360] __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211] [ 103.332171] ieee80211_sta_create_ibss+0x8c/0x10c [mac80211] [ 103.337895] ieee80211_ibss_work+0x3dc/0x614 [mac80211] [ 103.343185] ieee80211_iface_work+0x388/0x3f0 [mac80211] [ 103.348495] process_one_work+0x288/0x690 [ 103.352499] worker_thread+0x70/0x464 [ 103.356157] kthread+0x144/0x150 [ 103.359380] ret_from_fork+0x10/0x18 [ 103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < 932b338f4e5c4cb0c2ed640da3bced1e63620198 (git)
Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < 14b03b8cebdf18ff13c39d58501b625411314de2 (git)
Affected: e57b7901469fc0b021930b83a8094baaf3d81b09 , < 6e53d6d26920d5221d3f4d4f5ffdd629ea69aa5c (git)
Create a notification for this product.
    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.84 , ≤ 5.10.* (semver)
Unaffected: 5.15.7 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"https://git.kernel.org/stable/c/6e53d6d26920d5221d3f4d4f5ffdd629ea69aa5c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode\\n\\nFix the following NULL pointer dereference in mt7915_get_phy_mode\\nroutine adding an ibss interface to the mt7915 driver.\\n\\n[  101.137097] wlan0: Trigger new scan to find an IBSS to join\\n[  102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69\\n[  103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\\n[  103.073670] Mem abort info:\\n[  103.076520]   ESR = 0x96000005\\n[  103.079614]   EC = 0x25: DABT (current EL), IL = 32 bits\\n[  103.084934]   SET = 0, FnV = 0\\n[  103.088042]   EA = 0, S1PTW = 0\\n[  103.091215] Data abort info:\\n[  103.094104]   ISV = 0, ISS = 0x00000005\\n[  103.098041]   CM = 0, WnR = 0\\n[  103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000\\n[  103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000\\n[  103.116590] Internal error: Oops: 96000005 [#1] SMP\\n[  103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0\\n[  103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT)\\n[  103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211]\\n[  103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)\\n[  103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e]\\n[  103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e]\\n[  103.223927] sp : ffffffc011cdb9e0\\n[  103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098\\n[  103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40\\n[  103.237855] x25: 0000000000000001 x24: 000000000000011f\\n[  103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918\\n[  103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58\\n[  103.253785] x19: ffffff8006744400 x18: 0000000000000000\\n[  103.259094] x17: 0000000000000000 x16: 0000000000000001\\n[  103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8\\n[  103.269713] x13: 0000000000000000 x12: 0000000000000000\\n[  103.275024] x11: ffffffc010e30c20 x10: 0000000000000000\\n[  103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88\\n[  103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44\\n[  103.290952] x5 : 0000000000000002 x4 : 0000000000000001\\n[  103.296262] x3 : 0000000000000001 x2 : 0000000000000001\\n[  103.301572] x1 : 0000000000000000 x0 : 0000000000000011\\n[  103.306882] Call trace:\\n[  103.309328]  mt7915_get_phy_mode+0x68/0x120 [mt7915e]\\n[  103.314378]  mt7915_bss_info_changed+0x198/0x200 [mt7915e]\\n[  103.319941]  ieee80211_bss_info_change_notify+0x128/0x290 [mac80211]\\n[  103.326360]  __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211]\\n[  103.332171]  ieee80211_sta_create_ibss+0x8c/0x10c [mac80211]\\n[  103.337895]  ieee80211_ibss_work+0x3dc/0x614 [mac80211]\\n[  103.343185]  ieee80211_iface_work+0x388/0x3f0 [mac80211]\\n[  103.348495]  process_one_work+0x288/0x690\\n[  103.352499]  worker_thread+0x70/0x464\\n[  103.356157]  kthread+0x144/0x150\\n[  103.359380]  ret_from_fork+0x10/0x18\\n[  103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.84\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.7\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:13:08.646Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47540\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:13:08.646Z\", \"dateReserved\": \"2024-05-24T15:02:54.828Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:47.256Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.