HighFix available
ext4: fix invalid free tracking in ext4_xattr_move_to_block()
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 4.14.315, 4.19.283, 5.10.180, 5.15.112, 5.4.243, 6.1.29, 6.2.16, 6.3.3
- CVEs
- CVE-2023-54062
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:27 UTC · Revision 1
Source evidence
ext4: fix invalid free tracking in ext4_xattr_move_to_block()
core-osv · Original sourcePublished 24 Dec 2025, 12:23 UTC
In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.
osv:CVE-2023-54062
Kernel
Fixed versions: 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.112, 6.1.29, 6.2.16, 6.3.3
Complete source record
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