net: mvpp2: guard flow control update with global_tx_fc in buffer switching

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Summary

CVECVE-2026-23438
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 16:16:25 UTC
Updated2026-04-03 16:16:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: mvpp2: guard flow control update with global_tx_fc in buffer switching mvpp2_bm_switch_buffers() unconditionally calls mvpp2_bm_pool_update_priv_fc() when switching between per-cpu and shared buffer pool modes. This function programs CM3 flow control registers via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference priv->cm3_base without any NULL check. When the CM3 SRAM resource is not present in the device tree (the third reg entry added by commit 60523583b07c ("dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree")), priv->cm3_base remains NULL and priv->global_tx_fc is false. Any operation that triggers mvpp2_bm_switch_buffers(), for example an MTU change that crosses the jumbo frame threshold, will crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits pc : readl+0x0/0x18 lr : mvpp2_cm3_read.isra.0+0x14/0x20 Call trace: readl+0x0/0x18 mvpp2_bm_pool_update_fc+0x40/0x12c mvpp2_bm_pool_update_priv_fc+0x94/0xd8 mvpp2_bm_switch_buffers.isra.0+0x80/0x1c0 mvpp2_change_mtu+0x140/0x380 __dev_set_mtu+0x1c/0x38 dev_set_mtu_ext+0x78/0x118 dev_set_mtu+0x48/0xa8 dev_ifsioc+0x21c/0x43c dev_ioctl+0x2d8/0x42c sock_ioctl+0x314/0x378 Every other flow control call site in the driver already guards hardware access with either priv->global_tx_fc or port->tx_fc. mvpp2_bm_switch_buffers() is the only place that omits this check. Add the missing priv->global_tx_fc guard to both the disable and re-enable calls in mvpp2_bm_switch_buffers(), consistent with the rest of the driver.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a da089f74a993f846685067b14158cb41b879ff29 git Not specified
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a ff0c54f088f7ab91dbbf47cf8244460f99122750 git Not specified
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a 7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f git Not specified
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a 7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9 git Not specified
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a 8baced53a35fc9710f80d6ca016a2c418dc3231f git Not specified
CNA Linux Linux affected 3a616b92a9d17448d96a33bf58e69f01457fd43a 8a63baadf08453f66eb582fdb6dd234f72024723 git Not specified
CNA Linux Linux affected 5.12 Not specified
CNA Linux Linux unaffected 5.12 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8a63baadf08453f66eb582fdb6dd234f72024723 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8baced53a35fc9710f80d6ca016a2c418dc3231f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/da089f74a993f846685067b14158cb41b879ff29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff0c54f088f7ab91dbbf47cf8244460f99122750 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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