CVE-2021-47353

Summary

In the Linux kernel, the following vulnerability has been resolved:

udf: Fix NULL pointer dereference in udf_symlink function

In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL. Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails.

This fix adds a check to validate the value of epos.bh.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2f3d9ddd32a28803baa547e6274983b67d5e287caffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 371566f63cbd0bb6fbb25b8fe9d5798268d35af9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < baea588a42d675e35daeaddd10fbc9700550bc4daffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3638705ecd5ad2785e996f820121c0ad15ce64b5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 80d505aee6398cf8beb72475c7edcf1733c1c68baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 21bf1414580c36ffc8d8de043beb3508cf812238affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < aebed6b19e51a34003d998da5ebb1dfdd2cb1d02affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5150877e4d99f85057a458daac7cd7c01005d5c6affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux4.4.276 <= 4.4.*unaffected
LinuxLinux4.9.276 <= 4.9.*unaffected
LinuxLinux4.14.240 <= 4.14.*unaffected
LinuxLinux4.19.198 <= 4.19.*unaffected
LinuxLinux5.4.133 <= 5.4.*unaffected
LinuxLinux5.10.51 <= 5.10.*unaffected
LinuxLinux5.12.18 <= 5.12.*unaffected
LinuxLinux5.13.3 <= 5.13.*unaffected
LinuxLinux5.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References