CVE-2021-47353
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2024-4211.html
Vendor advisory: alma — https://bugzilla.redhat.com/2281346
Vendor advisory: alma — https://bugzilla.redhat.com/2281334
Vendor advisory: alma — https://bugzilla.redhat.com/2281311
Vendor advisory: alma — https://access.redhat.com/errata/RHSA-2024:4211
Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2024-4352.html
Vendor advisory: alma — https://bugzilla.redhat.com/2282920
Vendor advisory: alma — https://bugzilla.redhat.com/2282902
Vendor advisory: alma — https://bugzilla.redhat.com/2282735
Vendor advisory: alma — https://bugzilla.redhat.com/2282712
Vendor advisory: alma — https://bugzilla.redhat.com/2282698
Vendor advisory: alma — https://bugzilla.redhat.com/2282680
Vendor advisory: alma — https://bugzilla.redhat.com/2282653
Vendor advisory: alma — https://bugzilla.redhat.com/2282612
Vendor advisory: alma — https://bugzilla.redhat.com/2282609
Vendor advisory: alma — https://bugzilla.redhat.com/2282581
Vendor advisory: alma — https://bugzilla.redhat.com/2282472
Vendor advisory: alma — https://bugzilla.redhat.com/2282471
Vendor advisory: alma — https://bugzilla.redhat.com/2282400
Vendor advisory: alma — https://bugzilla.redhat.com/2282394
Vendor advisory: alma — https://bugzilla.redhat.com/2281986
Vendor advisory: alma — https://bugzilla.redhat.com/2281953
Vendor advisory: alma — https://bugzilla.redhat.com/2281925
Vendor advisory: alma — https://bugzilla.redhat.com/2281923
Vendor advisory: alma — https://bugzilla.redhat.com/2281920
Vendor advisory: alma — https://bugzilla.redhat.com/2281693
Vendor advisory: alma — https://bugzilla.redhat.com/2281689
Vendor advisory: alma — https://bugzilla.redhat.com/2281350
Vendor advisory: alma — https://bugzilla.redhat.com/2281272
Vendor advisory: alma — https://bugzilla.redhat.com/2281257
Vendor advisory: alma — https://bugzilla.redhat.com/2281255
Vendor advisory: alma — https://bugzilla.redhat.com/2281253
Vendor advisory: alma — https://bugzilla.redhat.com/2281251
Vendor advisory: alma — https://bugzilla.redhat.com/2281165
Vendor advisory: alma — https://bugzilla.redhat.com/2281157
Vendor advisory: alma — https://bugzilla.redhat.com/2281113
Vendor advisory: alma — https://bugzilla.redhat.com/2281057
Vendor advisory: alma — https://bugzilla.redhat.com/2280434
Vendor advisory: alma — https://bugzilla.redhat.com/2278354
Vendor advisory: alma — https://bugzilla.redhat.com/2278337
Vendor advisory: alma — https://bugzilla.redhat.com/2275733
Vendor advisory: alma — https://bugzilla.redhat.com/2275635
Vendor advisory: alma — https://bugzilla.redhat.com/2275633
Vendor advisory: alma — https://bugzilla.redhat.com/2275604
Vendor advisory: alma — https://bugzilla.redhat.com/2273429
Vendor advisory: alma — https://bugzilla.redhat.com/2273423
Vendor advisory: alma — https://bugzilla.redhat.com/2273278
Vendor advisory: alma — https://bugzilla.redhat.com/2273204
Vendor advisory: alma — https://bugzilla.redhat.com/2272829
Vendor advisory: alma — https://bugzilla.redhat.com/2272692
Vendor advisory: alma — https://bugzilla.redhat.com/2271680
Vendor advisory: alma — https://bugzilla.redhat.com/2270093
Vendor advisory: alma — https://bugzilla.redhat.com/2267730
Vendor advisory: alma — https://bugzilla.redhat.com/2267518
Vendor advisory: alma — https://bugzilla.redhat.com/2267513
Vendor advisory: alma — https://bugzilla.redhat.com/2266831
Vendor advisory: alma — https://bugzilla.redhat.com/2266408
Vendor advisory: alma — https://bugzilla.redhat.com/2265800
Vendor advisory: alma — https://bugzilla.redhat.com/2265520
Vendor advisory: alma — https://bugzilla.redhat.com/2265519
Vendor advisory: alma — https://bugzilla.redhat.com/2265517
Vendor advisory: alma — https://bugzilla.redhat.com/2258875
Vendor advisory: alma — https://bugzilla.redhat.com/2248122
Vendor advisory: alma — https://bugzilla.redhat.com/1918601
Vendor advisory: alma — https://access.redhat.com/errata/RHSA-2024:4352
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-47353
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-47353.html
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2024:4211
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2024:4352
Vendor advisory: rocky — https://errata.rockylinux.org/RXSA-2024:4211
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rocky | 8 | fixed | |
| sles | affected | | |
| debian | bookworm | fixed | 5.14.6-1 |
| debian | bullseye | fixed | 5.10.70-1 |
| debian | forky | fixed | 5.14.6-1 |
| debian | sid | fixed | 5.14.6-1 |
| debian | trixie | fixed | 5.14.6-1 |
References
- https://errata.rockylinux.org/RXSA-2024:4211
- https://errata.rockylinux.org/RLSA-2024:4352
- https://errata.rockylinux.org/RLSA-2024:4211
- https://www.suse.com/security/cve/CVE-2021-47353.html
- https://security-tracker.debian.org/tracker/CVE-2021-47353
- https://access.redhat.com/errata/RHSA-2024:4352
- https://bugzilla.redhat.com/1918601
- https://bugzilla.redhat.com/2248122
- https://bugzilla.redhat.com/2258875
- https://bugzilla.redhat.com/2265517
- https://bugzilla.redhat.com/2265519
- https://bugzilla.redhat.com/2265520
- https://bugzilla.redhat.com/2265800
- https://bugzilla.redhat.com/2266408
- https://bugzilla.redhat.com/2266831
- https://bugzilla.redhat.com/2267513
- https://bugzilla.redhat.com/2267518
- https://bugzilla.redhat.com/2267730
- https://bugzilla.redhat.com/2270093
- https://bugzilla.redhat.com/2271680
- https://bugzilla.redhat.com/2272692
- https://bugzilla.redhat.com/2272829
- https://bugzilla.redhat.com/2273204
- https://bugzilla.redhat.com/2273278
- https://bugzilla.redhat.com/2273423
Verify integrity in audit chain (admin only). AS-IS.