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vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF After a call to console_unlock() in vcs_write() the vc_data struct can be freed by vc_port_destruct(). Because of that, the struct vc_data pointer must be reloaded in the while loop in vcs_write() after console_lock() to avoid a UAF when vcs_size() is called. Syzkaller reported a UAF in vcs_size(). BUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119 Call Trace: __asan_report_load4_noabort (mm/kasan/report_generic.c:380) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_write (drivers/tty/vt/vc_screen.c:664) vfs_write (fs/read_write.c:582 fs/read_write.c:564) ... Allocated by task 1213: kmalloc_trace (mm/slab_common.c:1064) vc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680 drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058) con_install (drivers/tty/vt/vt.c:3334) tty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415 drivers/tty/tty_io.c:1392) tty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:921) vfs_open (fs/open.c:1052) ... Freed by task 4116: kfree (mm/slab_common.c:1016) vc_port_destruct (drivers/tty/vt/vt.c:1044) tty_port_destructor (drivers/tty/tty_port.c:296) tty_port_put (drivers/tty/tty_port.c:312) vt_disallocate_all (drivers/tty/vt/vt_ioctl.

Announced Source revision 1
Original source ↗

CVE-2023-53747

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2023-53747

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "934de9a9b659785fed3e820bc0c813a460c71fea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "0deff678157333d775af190f84696336cdcccd6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "a4e3c4c65ae8510e01352c9a4347e05c035b2ce2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "11dddfbb7a4e62489b01074d6c04d9d1b42e4047",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "3338d0b9acde770ee588eead5cac32c25e7048fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "1de42e7653d6714a7507ba6696151a1fa028c69f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff",
        "lessThan": "8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/tty/vt/vc_screen.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.38"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.38",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.14.327",
        "versionType": "semver",
        "lessThanOrEqual": "4.14.*"
      },
      {
        "status": "unaffected",
        "version": "4.19.284",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.244",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.181",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.113",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.30",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.3.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.3.*"
      },
      {
        "status": "unaffected",
        "version": "6.4",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/tty/vt/vc_screen.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2023-53747

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30314 · Revision 1
Added to Heist Feed
Publisher date
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