CVE-2021-47541

published 2024-05-24

CVE-2021-47541: In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In…

Priority P3 39 high 7.8 CVSS 3.1

AV L AC L PR L UI N S U C H I H A H

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

net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()

In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and
tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv().
After that mlx4_en_alloc_resources() is called and there is a dereference
of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to
a use after free problem on failure of mlx4_en_copy_priv().

Fix this bug by adding a check of mlx4_en_copy_priv()

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_MLX4_EN=m show no new warnings,
and our static analyzer no longer warns about this code.

Affected

17 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.15.15-1 (bookworm)	linux 5.15.15-1 (bookworm)
linux	linux	—	—
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < be12572c5ddc8ad7453bada4eec8fa46967dc757	be12572c5ddc8ad7453bada4eec8fa46967dc757
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 676dc7d9b15bf8733233a2db1ec3f9091ab34275	676dc7d9b15bf8733233a2db1ec3f9091ab34275
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < e461a9816a1ac5b4aeb61621b817225b61e46a68	e461a9816a1ac5b4aeb61621b817225b61e46a68
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b	f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 75917372eef0dbfb290ae45474314d35f97aea18	75917372eef0dbfb290ae45474314d35f97aea18
linux	linux	>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < addad7643142f500080417dd7272f49b7a185570	addad7643142f500080417dd7272f49b7a185570
linux	linux_kernel	>= 0 < 5.10.84-1	5.10.84-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 4.15 < 4.19.220	4.19.220
linux	linux_kernel	>= 4.20 < 5.4.164	5.4.164
linux	linux_kernel	>= 4.7 < 4.14.257	4.14.257
linux	linux_kernel	>= 5.11 < 5.15.7	5.15.7
linux	linux_kernel	>= 5.5 < 5.10.84	5.10.84

CVSS provenance

nvd v3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv 7.8 HIGH

vendor_debian 7.8 HIGH

vendor_redhat 7.8 HIGH

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CWE-416