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CVE-2023-54062

ext4: fix invalid free tracking in ext4_xattr_move_to_block()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.112, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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 However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored.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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From c7851208abffe5ae4deb01cf48763911dc14fc67 · fixed in 76887be2a96193cd11be818551b8934ecdb3123f; From f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7 · fixed in f30f3391d089dc91aef91d08f4b04a6c0df2b067; From 3b28c799a1334adb5a19f42f03abe0d8cbb05938 · fixed in ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a; From d738789ae9ec47d3458a008788f3cdc862ebf0cb · fixed in 1a8822343e67432b658145d2760a524c884da9d4; From a6744e14ce7045ab1a728bde9595f62fbd39f1d2 · fixed in 8beaa3cb293a8f7bacf711cf52201d59859dbc40; From 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf · fixed in c5fa4eedddd1c8342ce533cb401c0e693e55b4e3; From d2efaf8c870c7067b8d1779773134f3481cd8f68 · fixed in a18670395e5f28acddeca037c5e4bd2ea961b70a; From 1e9d62d252812575ded7c620d8fc67c32ff06c16 · fixed in b2fab1807d26acd1c6115b95b5eddd697d84751b; From 1e9d62d252812575ded7c620d8fc67c32ff06c16 · fixed in b87c7cdf2bed4928b899e1ce91ef0d147017ba45; From 4.14.308 · fixed in 4.14.315; From 4.19.276 · fixed in 4.19.283; From 5.4.235 · fixed in 5.4.243; From 5.10.173 · fixed in 5.10.180; From 5.15.99 · fixed in 5.15.112; From 6.1.16 · fixed in 6.1.29; From 6.2.3 · fixed in 6.2.16

  • Linux Linux

    6.3

  • KernelLinux

    fixed in 4.14.315; From 4.15.0 · fixed in 4.19.283; From 4.20.0 · fixed in 5.4.243; From 5.5.0 · fixed in 5.10.180; From 5.11.0 · fixed in 5.15.112; From 5.16.0 · fixed in 6.1.29; From 6.2.0 · fixed in 6.2.16; From 6.3.0 · fixed in 6.3.3

References 9

git.kernel.org